GOST 33212-2014

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  ГОСТ 33212-2014

GOST 33212−2014 cold-rolled sheet of isotropic electrical steel. Specifications

GOST 33212−2014

INTERSTATE STANDARD

COLD-ROLLED SHEET OF ISOTROPIC ELECTRICAL STEEL

Specifications

Non-grain oriented electrical steel strip. Specifications

ISS 77.140.40, 77.140.50

Date of introduction 2015−09−01

Preface

Goals, basic principles and procedure of works on interstate standardization have been established in GOST 1.0−92 «interstate standardization system. Basic provisions» and GOST 1.2−2009 «interstate standardization system. Interstate standards, rules and recommendations on interstate standardization. Rules of development, adoption, application, renewal and cancellation"

Data on standard

1 PREPARED by the Technical Committee for standardization TC 375 «steel Products from ferrous metals and alloys», Open joint stock company «Novolipetsk steel» (OJSC «NLMK»), a limited liability company «Charlestongirl Certification"

2 as AMENDED by the Federal Agency for technical regulation and Metrology

3 ACCEPTED by the Interstate Council for standardization, Metrology and certification (Protocol dated 22 December 2014 No. 73-P)

The adoption voted:

Short name of the country on MK (ISO 3166) 004−97	Country code MK (ISO 3166) 004−97	Abbreviated name of the national authority for standardization
Armenia	AM	The Ministry Of Economic Development Of The Republic Of Armenia
Belarus	BY	Gosstandart Of The Republic Of Belarus
Kyrgyzstan	KG	Kyrgyzstandard
Russia	EN	Rosstandart

4 this standard takes into account the basic regulatory provisions of the following standards:

— EH DIN 10106:2007* Kaltgewalztes nicht kornorientiertes Elektroblech und — band im schlussgegluhten Zust (Sheets and strips cold-rolled electrical steel with undirected grain, supplied in the fully processed state);
DIN EH 10341:2006 Kaltgewalztes Elektroblech und — band aus unlegierten legierten Stahlen und im nicht schlussgegluhten Zustland (Sheets and strips cold-rolled electrical alloyed and non-alloyed steel delivered in the semi-processed state);

— 60404−8-3 IEC:2005 Materiaux maqnetigues — Partie 8−3 Specifications materialaux pour particuliers — maqnetigues Toles et bandes en acier non allie et en acier allie, laminees a froid, livrees a I’etat semi-fini (magnetic Materials. Part 8−3 specifications for individual materials. Cold-rolled sheets and strip of electrical non-alloy and alloy steel supplied in the form of semi-finished products);

— 60404−8-4 IEC:1998 maqnetigues Materiaux de Partie 8−4 Specifications materialaux pour particuliers — maqnetigues Toles en acier a grains non orientes, laminees a froid et livrees a I’etat fini (magnetic Materials. Part 8−4 specifications for individual materials. Cold-rolled sheets and strips of electrical steel with undirected grain, supplied in the fully processed state).

The degree of compliance — non-equivalent (NEQ).

The standard is based on the application of GOST R 54480−2011

5 by Order of the Federal Agency for technical regulation and Metrology dated 27 January 2015 N 25 St interstate standard GOST 33212−2014 introduced as a national standard of the Russian Federation from September 1, 2015.

6 INTRODUCED FOR THE FIRST TIME


Information about the changes to this standard is published in the annual reference index «National standards», and the text changes and amendments — in monthly information index «National standards». In case of revision (replacement) or cancellation of this standard a notification will be published in the monthly information index «National standards». Relevant information, notification and lyrics are also posted in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet

1 Scope

This standard applies to cold rolled sheet-alloy and alloy steel electrotechnical isotropic (EIS) to a fully processed state in the form of the intermediate product with guaranteed magnetic properties, intended for the manufacture of magnetic cores (cores) of various kinds of electrical devices.

2 Normative references

This standard uses the regulatory references to the following international standards:

GOST 427−75 Rulers measuring metal. Specifications

GOST 2789−73 surface Roughness. Parameters and characteristics

GOST 2999−75 Metals and alloys. Method of measurement of hardness by Vickers

GOST 4381−87 Micrometers lever. General specifications

GOST 6507−90 Micrometers. Specifications

GOST 7566−94 metal Products. Acceptance, marking, packing, transportation and storage

GOST 11701−84 Metals. Methods tensile tests of thin sheets and strips

GOST 12119.0−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. General requirements

GOST 12119.4−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Method of measurement of specific magnetic losses and actual value of magnetic field intensity

GOST 12119.5−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Method of measurement of magnetic induction amplitudes and magnetic field

GOST 12119.8−98 electrotechnical Steel. Methods for determining magnetic and electrical properties. Method of measurement of resistance ratio of insulating coating

GOST 13813−68 (ISO 7799−85) Metals. Test method for bending of sheets and strips thickness less then 4 mm

GOST 21014−88 ferrous metals. Terms and definitions of defects

GOST 21427.2−83 cold-rolled isotropic electrotechnical Steel sheet. Specifications

GOST 26877−2008 metal Products. Methods of measuring form deviations of

Note — When using this standard appropriate to test the effect of reference standards in the information system of General use — on the official website of the Federal Agency for technical regulation and Metrology on the Internet or in the annual information index «National standards» published as on January 1 of the current year, and the editions of the monthly information index «National standards» for the current year. If the reference standard is replaced (changed), when using this standard should be guided by replacing (amended) standard. If the reference standard is cancelled without replacement, then the situation in which the given link applies to the extent that does not affect this link.

3 Terms and definitions

This standard applies the following terms with respective definitions:

3.1 magnetic induction , T: the measure of the magnetization of the ferromagnetic sample placed in an external magnetic field (A/m).

Magnetic induction and field intensity are connected by the relation:

, (1)

where is the magnetic permeability, O. E. (relative units);

— magnetic constant, equal to 410GN/m.

3.2 magnetic losses , W part of the power of the magnetic field by the sample magnetic material and dissipated as heat when exposed to the material changing in time of the electromagnetic field.

3.3 specific magnetic loss , W/kg Magnetic losses per unit mass of magnetic material.

Loss is determined at specified frequency electromagnetic fields and magnetic induction generated by the field in the magnetic core.

Certification of rental services carried out by results of measurements, obtained at a frequency of 50 Hz and magnetic induction of 1.5 Tesla.

3.4 anisotropy of specific losses , %: relative difference of magnetic loss of magnetic material measured along and across the direction of rolling.

3.5 thickness variation: Deviation form, characterized by the unevenness of thickness of steel products or parts according to width or length, which represents the difference largest and smallest values of thickness of metal at a given distance from the edges (GOST 26877).

3.6 camber: the deviation of the shape in which the edges of the sheet or strip in a horizontal plane have the shape of an arc (GOST 26877).

3.7 flatness: Deviation from flatness, in which the surface of metal products or individual parts have the form of alternating convexities or concavities, forming at least two peaks of individual waves, not provided for in the form of rental (GOST 26877).

3.8 plasticity: Repetitive bending at 90° in opposite directions flat sample, one end of which is secured in the fixture, consisting of jaws a specified size. Number of bends without breaking characterizes the ductility of the material.

3.9 internal (residual) stresses: Stresses at the box office, which may be partially preserved after heat treatment. Internal tension characterizes the maximum gap in the cut line.

3.10 curvature: Deviation from straightness, in which not all of the point lying on the geometrical axis of the steel, are equidistant from the horizontal or vertical plane in the longitudinal direction (GOST 26877).

3.11 the fill factor: the Ratio of the theoretical volume filled with metal, determined based on weight and density, to the actual volume received after compression at a given load set (package) of leaves.

3.12 coefficient of resistance of insulating coatings: Effective resistivity of a single layer insulation tested between the overlaid metal contacts and the base metal of the isolated test sample.

3.13 Burr: defect of a surface, representing sharp, a ridge, a ledge formed when cutting metal (GOST 21014, article 47).

3.14 aging: an Indicator used in relation to electrical steel to assess the degree of deterioration of its magnetic properties over a specified (long) period of time or over a relatively short period of time with increase in temperature.

3.15 adhesion: strength of adhesion of the insulating coating to the surface of the metallic base rental.

3.16 electrically insulating coating NSH: Coating on an organic basis, which does not withstand the temperature of annealing to relieve work hardening and improves stanoevski steel (class-3 standard [1]). To increase the coefficient of resistance may be added inorganic fillers (p-6 standard [1]).

3.17 electrically insulating coating TS: Coating on an organic basis, which added film-forming inorganic components in order to improve heat resistance and ceramic fillers to increase the coefficient of resistance, which can withstand temperatures of annealing to relieve work hardening and improves stanoevski steel (p-5 standard [1]).

3.18 nonstick coating AS: Thin film and nurture semi-organic coating TSH, anti-caking agent of the precursor during the annealing of finished products for consumers (class C-5-AS standard [1]).

3.19 fully processed products: cold-rolled steel, produced by technology of a complete process with a final annealing to obtain the magnetic properties in the delivery condition.

3.20 half-finished material: cold-rolled steel, produced by technology of polyprocess without final annealing to obtain the magnetic properties as supplied with guaranteed magnetic properties after annealing of magnetic cores (cores) of electrical devices.

4 Terms of the order

When ordering you must specify the following information.

4.1 Basic:

mark (designation) steel.

— the designation of this standard;

— type of steel (coil, sheet, strip);

— nominal dimensions;

— mass;

— the type (class) of the insulation coating;

— volume of required tests and appropriate test certificate.

4.2 Additional:

— the validity of welds and their labeling;

— the requirement for the surface quality;

— suitability for forging and cutting;

— typical density values;

the transverse thickness variation for a narrow band and its measurement;

— the fill factor;

— requirements for residual curvature;

— the minimum resistance ratio of insulating coating;

— requirements for mechanical properties of rolled;

— temperature testing;

marked rental.

In the absence of additional requirements to rent must correspond to the main specifications of this standard.

5 Classification and designation

5.1 rentals are divided as follows:

— by product:

roll;

the sheet is roll cut into predetermined lengths;

tape — roll, spread on strips of certain width;

according to the method of production (rolling), structural state of steel:

D — cold-rolled electrical isotropic steel;

requirements to the magnetic properties of the classes:

A — the fully processed the rental of normal quality;

AR — fully processed steel with high magnetic induction;

K — intermediate;

— types of coating:

heterostichum with an insulating organic coating that improves stanoevski, — NSH;

with heat-resistant and nurture semi-organic insulating coating that improves stanoevski, — SH;

with coating that prevents adhesion of the intermediate annealing, — AS.

5.2 Marking stamps

The designation marks consists of letters and numbers arranged in a sequence, for example D600−50A, where:

— the letter D — rolled cold-rolled isotropic;

— three digits after the D — factor normalized maximum value of the specific magnetic loss for alternating magnetization;

two digits (with a hyphen) is one hundred times the nominal thickness of the rolling, mm;

— A, AR, — letter designation class of steel.

6 Assortment

6.1 Dimensions and limit deviations

Rentals are made in the form of coils, sheets and strips, cut from the rolls, with the thickness of 0,27; 0,35; 0,50; 0,65; 1.00 mm in the fully treated condition and a thickness of 0,50; 0,65 mm in the semi-product.

The inner diameter of the roll shall be (500±10) mm. Outer roll diameter should be no more than 1500 mm.

Maximum deviations in thickness of the rolled nominal thickness shall not exceed: (0,27±0,02), (0,35±0,03), (0,50±0,04), (0,65±0,04), (1,00±0,05) mm.

The thickness variation across the width of the rental should not exceed 0.020 mm when the nominal plate thickness of 0,27; 0,35; 0,50 mm and not more than 0,030 mm with a nominal thickness of rolled 0,65; 1.00 mm. For rental of a width of 150 mm or less between the manufacturer and the customer can be matched to a different value of thickness variation.

The variable thickness along the length measured along the longitudinal axis of the rental should not exceed 0.02 mm for nominal thickness of 0.27 mm rentals; 0.03 mm — 0.35 mm; 0.04 mm — 0.50 mm and 0.65 mm; 0.05 mm — 1.00 mm.

6.2 the hire is supplied in rolls, sheets and tape with a nominal width not exceeding 1 250 mm. width of hire agreed when ordering.

6.3 Coils, sheets and strips are manufactured from obraznymi edges. Limit deviations must meet the requirements specified in table 1.


Table 1 — tolerances for width

Nominal width, mm	Limit deviation, mm
To 150 incl.	0 +0,2
SV. 150 to 300 incl.	0 +0,3
SV. 300 to 600 incl.	0 +0,5
SV. 600 to 1000 incl.	0 +1,0
SV. 1000−1250 incl.	0 +1,5
Note — By agreement with the client with the manufacturer products can be manufactured with these negative values of the limit deviations of nominal width.

6.4 Length of sheets and maximum deviations in length — by agreement with the client with the manufacturer. Maximum deviations along the length of the sheets should not exceed +0,5%/-0, but not more than +6 mm.

6.5 When winding the strip in the coil or strip should be sufficiently tight to avoid deformation of the rolls under its own weight when lifting the bracket and mount on the horizontal axis.

The coils can have seams, but welded. The validity, number of welds and their labeling agree to the request and when ordering.

Coils with welded joints shall consist of steel of the same brand, the same size and the same type of coverage.

Thickening from the weld relative to the measured thickness of the sheet, roll or tape must not exceed 0,050 mm.

6.6 Camber of hire should not exceed 0.5 mm and length 1.0 m.

6.7 Deviation from flatness shall not exceed 1.5%. The definition of flatness is carried out on the hire of a width exceeding 100 mm.

6.8 is basically a telescoping of rolls should not exceed 7 mm. One or two inner or outer coil can protrude above the surface of the end coil.

6.9 the Magnitude of the residual curvature (distance between the bottom edge of the test sample and the reference plate) to the thickness of 0,27; 0,35; 0,50; 0,65 mm should not exceed 35 mm. Requirements to the magnitude of the residual curvature of the rolled thickness of 1 mm to be agreed when ordering.

The definition of the curvature is carried out for a rolled width of 100 mm or more.

6.10 the height of the Burr on the edges of the rent should not exceed 0.020 mm.

Examples of symbols:

Rolled sheet in coil thickness 0.50 mm, width 1000 mm, of steel grade Д310−50A:

Roll 0,50х1000 — Д310−50A GOST 33212−2014

Rolled sheet in sheets thickness 0.35 mm, width 1000 mm, length 1500 mm of steel grade Д270−35A:

Sheet 0,50х1000х1500 — Д270−35A GOST 33212−2014

Tape with a thickness of 0.50 mm, a width of 300 mm of steel grade Д660−50K:

Tape 0,50х300 — Д660−50K GOST 33212−2014

7 Technical requirements

Rental supply in accordance with the requirements of this standard and of the order according to the technical documentation, duly approved.

7.1 General requirements

7.1.1 Method of smelting steel chemical composition and manufacturing technology of the rental is defined by the manufacturer in accordance with the approved engineering documentation.

If changes in the production of steel may lead to changing technical and (or) technological characteristics of the rental at the end user, the manufacturer of the rental, you should notify the buyer until delivery.

7.1.2 rental delivered in fully processed state or in the form of intermediate.

7.1.3 cold rolled fully processed state supply two-way permastone organic insulating coating NSH or bilateral and nurture semi-organic insulating heat-resistant coating scheme that improves stanoevski.

Cold-rolled steel in the form of supply without intermediate coatings with specified surface finish or nonstick coating AS.

Surface condition agree when prompted and when ordering.

Note — by agreement between the purchaser and the manufacturer products can be supplied with other types of coatings or uncoated.

7.1.4 rental in the state of delivery must have a surface without captured, bubbles, rust, holes and cracks. Allowed individual scratches, udivleny and other minor defects, provided they do not derive a rental for the limit deviation on thickness.

7.2 Magnetic and technological properties

7.2.1 Magnetic properties and the fill factor of rent in the state of delivery must conform to the standards specified in tables 2−4.

7.2.2 Plasticity determine fully processed for rental. The plasticity of the hire must ensure that the number of kinks corresponding to the requirements specified in tables 2 and 3.


Table 2 technological and Magnetic properties of fully processed rental normal quality

Steel grade	Nominal thickness of the rolling, mm	Magnetic properties			A fill factor of not less than	The minimum number of bends	The typical density, kg/DM
		Specific magnetic lossesin W/kg, not more	Magnetic induction , T, not less	Anisotropy of the specific magnetic losses , %, not more
D19,5−27A	0,27	19,5	Of 1.47	±18	0,92	2	7,60
Д250−35A	0,35	2,50	1,49	±17	0,95	2	7,60
Д270−35A		2,70	1,49	±17	0,95	2	7,65
Д300−35A		Of 3.00	1,49	±17	0,95	3	7,65
Д330−35A		3,30	1,49	±17	0,95	3	7,65
Д250−50A	0,50	2,50	1,49	±17	0,97	2	7,60
Д270−50A		2,70	1,49	±17	0,97	2	7,60
Д290−50A		2,90	1,49	±17	0,97	2	7,60
Д310−50A		3,10	1,49	±14	0,97	3	7,65
Д330−50A		3,30	1,49	±14	0,97	3	7,65
Д350−50A		3,50	1,50	±14	0,97	5	7,65
Д400−50A		Of 4.00	1,53	±12	0,97	5	7,70
Д470−50A		4,70	1,54	±10	0,97	10	7,70
Д530−50A		5,30	1,56	±10	0,97	10	7,70
D600−50A		6,00	1,57	±10	0,97	10	7,75
D700−50A		7,00	1,60	±10	0,97	10	7,80
D800−50A		8,00	1,60	±10	0,97	10	7,80
Д940−50A		9,40	1,62	±8	0,97	10	7,85
Д310−65A	0,65	3,10	1,49	±15	0,97	2	7,60
Д330−65A		3,30	1,49	±15	0,97	2	7,60
Д350−65A		3,50	1,49	±14	0,97	2	7,60
Д400−65A		Of 4.00	1.52 m	±14	0,97	2	7,65
Д470−65A		4,70	1,53	±12	0,97	5	7,65
Д530−65A		5,30	1,54	±12	0,97	5	7,70
D600−65A		6,00	1,56	±10	0,97	10	7,75
D700−65A		7,00	1,57	±10	0,97	10	7,75
D800−65A		8,00	1,60	±10	0,97	10	7,80
Д1000−65A		10,00	Of 1.61	±10	0,97	10	7,80
D600−100A	Of 1.00	6,00	1,53	±10	0,98	2	7,60
D700−100A		7,00	1,54	±8	0,98	3	7,65
D800−100A		8,00	1,56	±8	0,98	5	7,70
Д1000−100A		10,00	1,58	±8	0,98	10	7,80
Д1300−100A		13,00	1,60	±8	0,98	10	7,80
Given the specific loss products with thickness 0,35; 0,50; 0,65 mm for aged specimens with plate thickness of 0,27; 1.00 mm for samples without aging. Other density values can be specified in the request and ordering.

Table 3. Magnetic and technological properties of fully processed steel with high magnetic induction

Steel grade	Nominal thickness of the rolling, mm	Magnetic properties			A fill factor of not less than	The minimum number of bends	The typical density, kg/DM
		Specific magnetic lossesin W/kg, not more	Magnetic induction , T, not less	Anisotropy of the specific magnetic losses , %, not more
Д310−50AR	0,50	3,10	1.55 V	±14	0,97	3	7,70
Д330−50AR		3,30	1.55 V	±14	0,97	3	7,70
Д350−50AR		3,50	1,59	±12	0,97	5	7,65
Д400−50AR		Of 4.00	Of 1.61	±12	0,97	5	7,70
Д450−50AR		4,50	1,64	±12	0,97	5	7,70
D500−50AR		5,00	1,65	±12	0,97	10	7,80
Д530−50AR		5,30	1,62	±10	0,97	10	7,80
D600−50AR		6,00	1,64	±10	0,97	10	7,80
D700−50AR		7,00	1,66	±10	0,97	10	7,85
D800−50AR		8,00	1,66	±10	0,97	10	7,85
Д350−65АР	0,65	3,50	1,57	±12	0,97	5	7,60
D700−65АР		7,00	1,64	±10	0,97	10	7,80
D800−65АР		8,00	1,66	±10	0,97	10	7,80
Given specific losses of rental with thickness of 0,50; 0,65 mm for aged samples. Other density values can be specified in the request and ordering.

Table 4 — Magnetic and technological properties of the intermediate

Steel grade	The thickness of rolling, mm	The certification temperature of annealing, °C (±10°C)	Magnetic properties		Typical value density, kg/DM
			Specific magnetic losses in W/kg, not more	Magnetic induction, T, not less
Д340−50K	0,50	840	3,40	1,54	7,65
D390−50K		840	3,90	1,56	7,70
Д450−50K		790	4,50	1,57	7,75
Д560−50K		790	5,60	1,58	7,80
Д660−50K		790	6,60	1,62	7,85
Д890−50K		790	8,90	1,60	7,85
Д1050−50K		790	10,50	1,57	7,85
D390−65K	0,65	840	3,90	1,54	7,65
Д450−65K		840	4,50	1,56	7,70
Д520−65K		790	5,20	1,57	7,75
Д630−65K		790	6,30	1,58	7,80
D800−65K		790	8,00	1,62	7,85
Д1000−65K		790	10,00	1,60	7,85
Д1200−65K		790	12,00	1,57	7,85
Values pertain only to the samples after the attestation of annealing, anisotropy of magnetic loss and magnetic induction can be specified when you request and order. Other density values can be specified in the request and ordering.

7.2.3 Internal stresses determined for fully processed rolled, of a width exceeding 150 mm. the Maximum gap between the cut lines, which characterizes the magnitude of internal stresses should not exceed 2 mm.

7.2.4 Coefficient of resistance of double-sided insulation coating (TSH) and (NSH) shall not be less than 3.0 Ohmscm. Another value of the minimum coefficient of drag of coverage or requirements for minimum resistance factor of the coating for each side of the rental, as well as requirements for resistance to coolants and oils, weldability, the customer agrees with the manufacturer when ordering.

7.2.5 Insulating coating (TSH) should maintain the grip with a metal base and provide a minimum resistance of 1.0 Ohmcmwhen heated to 450 °C for 2 h in air or when heated to 750 °C for 2 h in a protective atmosphere.

If necessary, the authority may agree with the manufacturer and other requirements for the annealing conditions in the order.

Electrically insulating coating (NSH) must maintain the grip with a metal base and to provide a minimum coefficient of resistance, agreed upon between the purchaser and the manufacturer when ordering, when heated to 200 °C for 2 h in air.

7.2.6 To the nonstick coating (AS), anti-caking agent of the precursor during the annealing, the requirements for the resistance coefficient and thickness do not show.

7.2.7 cover the rental should be free of peeling when bending the sample 90° and when cutting.

7.2.8 the ageing Factor fully processed the rental Desk at energy-losses should not exceed 6%.

In case of exceeding the norms in the coefficient aging rental otestovat mark corresponding to the level of specific magnetic losses, obtained on samples after aging.

7.2.9 the sheet and tape apply the results of the test roll, of which was cutting.

7.3 Specific magnetic losses , fully processed rolled ordinary quality are given in table A. 1 (Appendix A).

7.4 Specific magnetic losses of the precursor is given in table A. 2 (Appendix A).

7.5 Typical mechanical properties of rolled electrotechnical steel of ordinary quality are given in table B. 1 (Appendix B).

7.6 Typical mechanical properties of the intermediate electrical steel is presented in table B. 2 (Appendix B).

7.7 Design parameters are given in Appendix B.

7.8 Special requirements for mechanical properties and hardness to ensure the technological properties of hire to the cutting and cutting, if necessary, should be established by agreement between the manufacturer and the customer.

7.9 Compliance fine assortment of fully processed rental usual quality for this standard and GOST 21427.2 are given in table G. 1 (Appendix G).

7.10 Compliance fine assortment of fully processed steel with high magnetic induction under this standard and GOST 21427.2 are given in table D. 1 (Annex D).

8 Rules of acceptance

8.1 General rules of acceptance GOST 7566.

8.2 rental take parties. For the party, take one coil of the same brand, same size.

8.3 Sampling for tests carried out from each unit of production (batch).

The first inner coil and the outermost coil of the roll of wrapping believe.

Sampling is carried out from the first external or internal revolution of the roll, except for wrapping the coils.

The tape and sheets obtained by cutting the roll to a predetermined width and length, such as one roll.

8.4 Certification control the size, thickness variation, flatness, camber, surface condition and edges, testing the magnetic properties, the quality of the coating manufacturer spends on each party.

8.5 Certification of the control of mechanical properties and hardness, if necessary, is carried out according to the technical requirements agreed between manufacturer and customer.

8.6 Periodic monitoring of fill factor and sound insulating properties of the coating, internal stress, plasticity, mechanical properties, hardness and aging manufacturer holds not less than ten parties per quarter.

If unsatisfactory test results are transferred to qualification tests to get a positive result for three parties in a row.

8.7 If you change the basic formulations or methods of applying insulating coatings carried out routine tests on a single roll.

8.8 If unsatisfactory test results of at least one of the indicators of re-examination it is carried out according to GOST 7566.

8.9 After re-testing the manufacturer has the right to present again to the acceptance testing unit rental, which revealed a failure to meet the conditions of delivery.

9 test Methods

9.1 Preparation of samples

9.1.1 Dimensions and limit deviations

To determine the thickness, width, length, longitudinal and transverse thickness variation, deviation from flatness, camber of a roll (batch) is taken from the beginning of one segment length from 1000 to 2000 mm along the direction of rolling.

The sample for measurement of the curvature consists of one cut strip roll length of 500mm, a width corresponding to the width of the strip.

9.1.2 Magnetic properties

Samples for the determination of the magnetic properties of the Epstein apparatus are manufactured from strips of a length of from 280 to 305 mm, width (30,0±0,2) mm. Strips should not differ from each other in length by more than ±0.5 mm. the Number of stripes in the sample must be a multiple of four, the minimum number of strips is equal to eight.

Half of the strips cut along the rolling direction, and the other half across the direction of rolling, providing a uniform distribution across the width of the strip. The angle between the set direction and the cutting direction of the stripes shall be ±5°.

The edge strips of the sheets rolled in sample not included.

When the bandwidth is insufficient for the selection of strips for testing across the direction of rolling, the strips are taken only in the direction of rolling.

9.1.2.1 Samples for measurement of specific magnetic losses fully processed products with thickness 0,35; 0,50; 0,65 mm shall be subjected to thermal aging. Samples of the rolled thickness of 0.27; 1.00 mm not subjected to aging.

The annealing conditions on the aging: heating up to temperature (225±5)°C, holding for 24 h, cooled with an arbitrary velocity to the ambient temperature.

The annealing is subjected to strips, stacked.

9.1.2.2 intermediate Samples before determining the magnetic properties should be subjected to certification annealing on magnetic properties.

Temperature annealing: heating to the temperature set out in table 4 at a speed of not more than 200°C/h, holding for 2 h, cooling from the annealing temperature to a temperature of 550 °C at a speed of not more than 120°C/h.

Gas annealing mode: decarburization, nitrogen-hydrogen atmosphere with a volume fraction of hydrogen from 5% to 20%, with humidity on the dew point from + 18 °C to 22 °C. the Flow rate and pressure of the gas mixture must provide a uniform decarburization stripes.

For a uniform decarburization intermediate strips are placed in a stack, the strips should not have contact with each other (for example, by stitching between the strips of fine wire).

Note — In the case of very low mass fraction of carbon in the steel, the manufacturer may use a non-standard gas annealing mode in neobespecheniya (neutral or reducing) atmosphere and recommend this mode to the consumer.

9.1.3 Technological properties

9.1.3.1 the fill Factor is determined on a sample composed of 100 selected to determine the magnetic properties of the strips (cut along and (or) across the direction of rolling), which before the test, remove the burrs.

9.1.3.2 Test bend is carried out on four specimens with a width of 20−40 mm, cut with no visible burrs. The samples cut along and across the direction of rolling. Two samples cut at a distance of 30−90 mm from the edge, two samples from the middle of the segment or sheet.

9.1.3.3 For testing mechanical properties tensile cut out 4 samples for hardness testing — 2 sample size (20±0,1)x (210±0,5) mm. the samples cut at a distance of 30−90 mm from the edge along the direction of rolling.

9.1.3.4 For determination of internal stresses for party rental take one sample length of 1,000 mm and a width equal to the width of the roll.

9.1.3.5 For determining the coefficient of resistance of insulation coating from each roll (of the party) take and test one sample.

From the reference card across the direction of rolling cut out a sample width of 50−60 mm and a length equal to the width of the roll.

9.1.3.6 For evaluation of adhesion (the adhesive strength of the insulating coating to the metal) of each roll (of the party) take and test one sample, cut along the direction of rolling, ranging in length from 280 to 305 mm and width 30 mm.

9.1.3.7 regulated To control the surface roughness of hire, provided as intermediate product, from each roll (of the party) take and test one sample size (50±0,2)x (50±0,2) mm.

9.2 Methods of control and testing

The conditions for testing the technical characteristics of the car — under shot 12119.0 if the following additional conditions.

All the measuring instruments used to determine the quality of the finished product must be included in the state registry of measuring and have calibration certificates issued by the organizations accredited in the established order.

9.2.1 Control of dimensions, limit deviations and shape of the rolled

9.2.1.1 the size of the rental check of the measuring instruments: thickness — a micrometer according to GOST 6507 or GOST 4381, the width of the metal ruler according to GOST 427или other measurement means appropriate accuracy.

Note — For accurate measurement of thickness of hire, it is possible to use a radioisotope and x-ray thickness gauges.

9.2.1.2 Average actual thickness of the hire is determined by the measurement results of the sample length from 1000 to 1500 mm at four points located on each side of the middle of the sample at a distance of not less than 20 mm from the edges.

9.2.1.3 Lateral thickness variation is determined on the rental of a width exceeding 150 mm in the four points located at the two edges across the direction of rolling at a minimum distance of 15 mm from the edge of the rental.

9.2.1.4 Longitudinal thickness variation is determined in the direction of rolling at six points located on each side of the middle of the sample at a distance of not less than 15 mm from the edge of the rental.

9.2.1.5 Width measured across the longitudinal axis of the rental.

Maximum deviation in width is the maximum deviation of width from nominal.

9.2.1.6 Monitoring deviations from flatness, camber, curvature is carried out according to GOST 26877.

9.2.1.7 the Determination of deviation from flatness is performed on the rolled width more than 100 mm in the direction of rolling.

9.2.1.8 detection of residual curvature is carried out on a sample length of 500 mm and a width equal to the width of the rolled, cut in direction of rolling. The definition of the curvature are for the rental of a width exceeding 100 mm.

9.2.1.9 the height of the Burr on the edge of the rental is determined with a micrometer as the difference of sample measurements at the edge and at a distance of 10 mm from the edge.

9.2.2 Control surfaces fully machined rolled and semi-finished products with a nonstick coating is carried out visually.

The control regulated the surface roughness of hire, provided as intermediate product, is carried out according to GOST 2789.

9.2.3 Magnetic properties

9.2.3.1 Measurements of magnetic induction and of specific magnetic losses in the apparatus Epstein is carried out in accordance with the requirements of GOST 12119.4, GOST 12119.5.

The measurements of magnetic properties taking the density of steel specified in tables 2−4.

For measurements with increased accuracy take a calculated density depending on the mass fraction of silicon and aluminum in steel (In the app).

At the request of customers allowed to conduct measurements with the use of foreign standards-analogues for these types of tests.

Note — allowed measurement of the magnetic properties of other methods, including using plants for continuous control type EVA, to ensure the necessary accuracy, entered into the State register of measuring instruments and provided with valid verification certificates issued by the organizations accredited in the established order.

9.2.3.2 For determining the anisotropy of the specific magnetic losses is carried out measurement of specific magnetic losses (W/kg) separately on the samples of Epstein strips taken along and across the direction of rolling. Anisotropy loss (%) is calculated by the formula

, (2)

where and is the specific magnetic losses across and along the direction of rolling, respectively.

9.2.3.3 To determine the ageing factor sample Epstein after determining the magnetic properties is subjected to annealing (thermal aging) according to the regime described in paragraph 9.1.2.1. After annealing again measure the specific magnetic losses. The tendency of the steel to aging is evaluated by the coefficient of aging is measured in percent:

, (3)

where and is the specific magnetic losses before and after aging, respectively.

Test EIS on aging are selectively 10 the parties within three months.

9.2.4 Technological properties

9.2.4.1 the fill Factor

The sample is pressed evenly across the surface under pressure of 0.35 N/mm. The height of the compressed sample is measured with an error of less than 0.1 mm in four opposite places. For the height take the average of results of four measurements.

The fill factor () is calculated by the formula

, (4)

where is the mass of sample, kg, determined with an accuracy of 0.005 kg;

 — the volume of the sample after pressovaniya determined according to the measurement results of pack, m;

 — the density of steel, kg/m.

Test hire selectively conduct 10 batches per quarter.

9.2.4.2 Number of kinks

The tests are carried out according to GOST 13813 using the device for the test strip at the bend with a radius of curvature of the jaws 5 mm at a temperature of from 15 °C to 35 °C.

During the test shall be provided with a permanent adhesion of the sample to the surface of the sponges.

Single bend from the starting position at 90° and back to original position consider number of inflection 1.

Test is interrupted at the first appearance of cracks, visible to the naked eye, on the base material. The obtained values of the number of bends are rounded to the nearest whole number.

As the attestation result to use the average value for the four samples.

9.2.4.3 Mechanical properties tensile

The tests are carried out according to GOST 11701. Allowed to use non-destructive methods of control.

9.2.4.4 Hardness

The tests are carried out according to GOST 2999 at a load of 5 kg.

9.2.4.5 Internal voltage

A sample length of 1,000 mm and a width equal to the width of the roll, cut into two parts in the direction of rolling around the middle of the strip width. The two parts join along the line of the cut flat plate and carry a maximum clearance dimension between the cutting lines, which characterizes the magnitude of internal stresses.

9.2.4.6 Coefficient of resistance insulation coating

Measurement of current and resistance coefficient of the coating is carried out on deletecontacts the installation of Franklin in accordance with GOST 12119.8.

Current measurements carried out on the same sample at two sites on each side of the samples, i.e. four times.

According to the measurement results calculate the following parameters:

— average amperage on the bottom of the strip;

— average amperage to the top of the strip, the average current on both sides.

Coefficient of resistance , Ohm·cm, on both sides of the sample is calculated by the formula

, (5)

where  — the average value of the amperage on both sides, A.

Coefficient of resistance , Ohm·cm, on one side of the sample is calculated by the formula

, (6)

where  — the average value of the current on one side, A.

9.2.4.7 Adhesion of the insulation surface

For testing the adhesive strength of the coating with the metal base sample pressed against the rod with 5 mm diameter and smoothly bent 90° around the web.

Visual inspection should not be cracking and peeling off the insulating coating on the outside of the sample in the testing device.

10 Marking and packing

10.1 Labeling and packaging — according to GOST 7566 with the following additions.

10.2 Each roll must have a manufacturer’s label of the established sample with clear information.

10.3 Label that contains information about the coil should be located:

— on the inner side of the roll;

on the outside of the roll;

— the external protective packaging (if using).

10.4 the labels of a roll or stack of sheets indicate the trademark of the manufacturer, the melting number, batch number, size of rental, mass.

On the label of the protective outer package additionally represent the brand of rental.

10.5 Bulk rolls or packs of sheets must be agreed upon ordering between the purchaser and the manufacturer. The maximum deviation of the net weight of coils shall be not more than ±10 kg.

Bulk rolls or packs of sheets in the package and their sizes must meet the conditions for supply.

10.6 Packaging must be performed in accordance with the approved schemes and to protect the rental from mechanical damage and environmental influences during loading, transportation and storage.

11 Certification

11.1 the Manufacturer shall provide the customer with the goods delivery a quality certificate including information about the test results of each batch of rolled, confirming compliance with the specification on delivery.

11.2 At the request of the customer, the manufacturer must provide a safety certificate for rental in accordance with applicable law.

12 Transportation and storage

12.1 General requirements transportation and storage — by GOST 7566 with the following additions.

12.2 rental transporterowych by all kinds of transport in accordance with cargo carriage regulations applicable to transport of this species.

Transport rental rail transport is carried out in covered wagons, platforms or open wagons in accordance with the rules of cargo transportation by rail.

12.3 hire in unopened manufacturer’s packaging must be stored in covered warehouses excluding ingress of moisture.

Maximum warranty period of storage without deterioration of consumer properties of the quality of the surface is 6 months from date of delivery.

13 Complaints

The manufacturer guarantees the rental of this standard, subject to the requirements of transportation and storage.

The customer must give the manufacturer the opportunity to verify the validity of claims, namely through the provision of rental, which filed the complaint, and documents.

The complaint filed in accordance with the standard [2].

Annex a (informative). Specific magnetic losses P (1,0/50), P (1,5/60) fully machined to rent standard quality and P (1,0/50) intermediate

Appendix A
(reference)

Specific magnetic losses , fully processed rolled regular quality and intermediate

Table A. 1 — Specific magnetic losses , completely machined hire normal-quality

Mark (designation) steel	Nominal thickness of the rolling, mm	Specific magnetic loss W/kg, not more
D19,5−27A	0,27	10,7	-
Д250−35A	0,35	Of 1.00	3,14
Д270−35A		1,10	3,36
Д300−35A		1,20	3,74
Д330−35A		1,30	4,12
Д250−50A	0,50	1,05	3,21
Д270−50A		1,10	3,47
Д290−50A		1,15	3,71
Д310−50A		Of 1.23	3,95
Д330−50A		1,35	4,20
Д350−50A		1,50	4,45
Д400−50A		1,70	5,10
Д470−50A		Of 2.00	5,90
Д530−50A		2,30	Of 6.65
D600−50A		2,60	Of 7.53
D700−50A		Of 3.00	8,79
D800−50A		3,60	10,06
Д940−50A		4,20	Of 11.84
Д310−65A	0,65	1,25	4,08
Д330−65A		1,35	4,30
Д350−65A		1,50	4,57
Д400−65A		1,70	5,20
Д470−65A		Of 2.00	Of 6.13
Д530−65A		2,30	6,84
D600−65A		2,60	Of 7.71
D700−65A		Of 3.00	Of 8.96
D800−65A		3,60	Of 10.26
Д1000−65A		4,40	12,77
D600−100A	Of 1.00	2,60	8,14
D700−100A		Of 3.00	Of 9.38
D800−100A		3,60	10,70
Д1000−100A		4,40	13,39
Д1300−100A		5,60	Of 17.34

Table A. 2 — Specific magnetic losses intermediate

Mark (designation) steel	Nominal thickness of the rolling, mm	Specific magnetic lossesin W/kg, not more
Д340−50K	0,50	1,42
D390−50K		1,62
Д450−50K		1,92
Д560−50K		2,42
Д660−50K		2,80
Д890−50K		3,70
Д1050−50K		4,30
D390−65K	0,65	1,62
Д450−65K		1,92
Д520−65K		2,22
Д630−65K		Of 2.72
D800−65K		3,30
Д1000−65K		4,20
Д1200−65K		5,00
Values pertain only to the samples after annealing attestation.

Annex B (reference). Typical mechanical properties of rolled electrotechnical steel of ordinary quality and intermediate

Appendix B
(reference)

Table B. 1 — Typical mechanical properties of rolled electrotechnical steel of ordinary quality

Steel grade	Mechanical properties
	Excesses.	units.	, N/mm	, N/mm		, %
Д300−35A Д330−35A	more than 3	182 (171−202)	359 (330−420)	482 (450−540)	0,75 (0,72−0,78)	19 (13−25)
Д290−50A	more than 3	191 (188−195)	366 (355−380)	496 (480−515)	0,74 (0,73−0,75)	20 (19−24)
Д310−50A	9 (6−12)	195 (191−205)	392 (355−425)	510 (470−545)	0,77 (0,76−0,78)	21 (19−23)
Д330−50A	11 (6−15)	197 (186−210)	392 (365−430)	511 (485−555)	0,77 (0,74−0,79)	20 (16−24)
Д350−50A	14	195	395	515	0,77	18
Д400−50A	15	168 (154−193)	336 (240−370)	488 (390−525)	0,69 (0,59−0,88)	27 (21−33)
Д470−50A	15	126 (117−141)	234 (205−300)	403 (380−455)	0,58 (0,53−0,66)	30 (23−34)
Д530−50A	15	128 (122−137)	248 (215−290)	411 (380−445)	0,60 (0,55−0,66)	29 (27−33)
D600−50A	15	130 (121−141)	259 (235−300)	411 (395−455)	0,63 (0,59−0,69)	28 (24−30)
D700−50A	15	125,5 (125−126)	235 (230−240)	382,5 (380−385)	0,61 (0,61−0,62)	27,5 (27−28)
D800−50A	more than 10	123 (110−140)	243 (185−290)	404 (350−425)	0,62 (0,53−0,71)	30,5 (26−34)
Д940−50A	>10	118 (108−131)	228 (200−260)	383 (365−425)	0,60 (0,54−0,65)	32 (29−36)
Д400−65A	11 (7−13)	202 (191−215)	400 (380−420)	528 (510−555)	0,76 (0,73−0,79)	21 (14−26)
Д470−65A	more than 5	168 (157−178)	325 (305−345)	470 (450−490)	0,69 (0,67−0,72)	28 (24−32)
Д530−65A	more than 5	149 (143−165)	276 (340−360)	440 (425−500)	0,63 (0,60−0,68)	30 (27−32)
D600−65A	15	131 (124−144)	245 (220−270)	408 (390−430)	0,60 (0,56−0,64)	30 (25−33)
D700−65A	more than 10	138 (116−161)	302 (225−360)	400 (380−475)	0,65 (0,61−0,68)	31 (27−34)
D800−65A	more than 10	126 (112−153)	231 (190−373)	383 (295−445)	0,60 (0,53−0,71)	32 (28−35)
Д1000−65A	more than 10
Д1000−100A Д1300−100A	15	131 (130−132)	231 (225−240)	400 (395−405)	0,58 (0,56−0,59)	32,6 (32−33)
Note — the Average of the measurements measurements (minimum — maximum value of measurement)

Table B. 2 — Typical mechanical properties of the intermediate electrical steel

Steel grade	Mechanical properties
	units.	, N/mm	, N/mm		, %
Д660−50K	155 (Length 145−170)	410 (370−460)	490 (460−520)	0,84 (0,80−0,88)	28 (24−23)
D800−65K	152 (140−175)	400 (370−450)	480 (450−530)	0,835 (0,79−0,88)	28 (24−33)
Д660−50K	161 (148−173)	405 (370−440)	495 (460−520)	0,825 (0,78−0,87)	28 (24−33)
D800−65K	160 (148−172)	410 (385−440)	497 (460−525)	0,825 (0,79−0,86)	28 (23−33)
Д450−50K	(158−160)	(445−450)	(530−560)	(0,84−0,85)	(26−27)
Д520−65K	(164−192)	(410−450)	(485−530)	(0,81−0,86)	(24−29)
Note — the Average value of the measurements (minimum — maximum value of measurement)

Annex b (informative). The design characteristics

The App
(reference)

1 When the query and the order by agreement between the manufacturer and the customer to determine density, you can use the standard equation [3] (Appendix C)

, (V. 1)

where is the numerical value of density, kg/DM;

 — the numeric value of the mass fraction of silicon, %;

 — the numeric value of the mass fraction of aluminum, %.

2 Estimated density of steel to test magnetic properties are used depending on the mass fraction of silicon and aluminium in steel, as shown in table B. 1.


Table B. 1

(%Si+1,7% AI)	The estimated density, g/cm
0,00−0,65	7,85
0,66−1,40	7,80
1,41-of 2.15	7,75
Of 2.16 to 2.95	7,70
2,96−3,70	7,65
3,71−4,50	7,60

3 the value of the specific magnetic losses in W/kg or W/lb, determined by calculation according to the formulas:

; (V. 2)

. (V. 3)

By agreement between manufacturer and the customer value of specific magnetic losses can be determined by direct measurements.

4 Private (internal, true) magnetization of the ferromagnetic sample, the magnetic polarization , T, can be calculated according to the formula

, (B. 4)

where is magnetic induction, T;

 — magnetic constant equal to 4·10, GN/m;

 — magnetic field strength, A/m.

Appendix d (reference). Compliance fine assortment of fully processed rental usual quality for this standard and GOST 21427.2

Appendix D
(reference)

Table G. 1 — Compliance fine assortment of fully processed rental usual quality for this standard and GOST 21427.2

Steel grade according to this standard	Nomination Lina the thickness of rolling, mm	Magnetic properties			Mark (refer to increase) starhost 21427.2	Nomination Lina the thickness of rolling, mm	Magnetic properties
		Udel- nye magni- tnye loss , W/kg, not more	Magni- supply return scale- tion , T, not less	Anisot- rope specific magnetic losses , %, not more			Specific magnetic losses in W/kg, not more	Magnetic induction , T, not less	Anisot- rope specific magnetic losses , %, not more
D19,5−27A	0,27	19,5	Of 1.47	±18	2421	0,27	19,5	Of 1.47	±18
Д250−35A	0,35	2,50	1,49	±17	2413	0,35	2,50	1,50	±18
Д270−35A		2,70	1,49	±17	2412		2,70	1,50	±18
Д300−35A		Of 3.00	1,49	±17	2411		Of 3.00	1,50	±18
Д330−35A		3,30	1,49	±17	-		-	-	-
Д250−50A	0,50	2,50	1,49	±17	-	0,50	-	-	-
Д270−50A		2,70	1,49	±17	2414		2,70	1,49	±18
Д290−50A		2,90	1,49	±17	2413		2,90	1,50	±18
Д310−50A		3,10	1,49	±14	2412		3,10	1,50	±18
Д330−50A		3,30	1,49	±14	-		-	-	-
Д350−50A		3,50	1,50	±12	-		-	-	-
-		-		-	2411		3,60	1,49	±18
Д400−50A		Of 4.00	1,53	±12	2216		Of 4.00	1,60	±12
Д470−50A		4,70	1,54	±10	-		-	-	-
-		-	-	-	2214		4,80	1,62	±12
-		-	-	-	2212		5,00	1,60	±12
Д530−50A		5,30	1,56	±10	-		-	-	-
-		-	-		2211		5,50	1,56	±12
D600−50A		6,00	1,57	±10	2112		6,00	1,62	±12
D700−50A		7,00	1,60	±10	2111		7,00	1,60	±10
		-	-	-	2012		7,00	1,62	±10
D800−50A		8,00	1,60	±10	2011		8,00	1,60	±10
Д940−50A		9,40	1,62	±8	-		-	-	-
Д310−65A	0,65	3,10	1,49	±15	-	-	-	-	-
Д330−65A		3,30	1,49	±15	-		-	-	-
Д350−65A		3,50	1,49	±14	-		-	-	-
Д400−65A		Of 4.00	1.52 m	±14	-		-	-	-
Д470−65A		4,70	1,53	±12	-		-	-	-
Д530−65A		5,30	1,54	±12	-		-	-	-
D600−65A		6,00	1,56	±10	-		-	-	-
D700−65A		7,00	1,57	±10	-		-	-	-
D800−65A		8,00	1,60	±10	-		-	-	-
Д1000−65A		10,00	Of 1.61	±10	-		-	-	-
D600−100A	Of 1.00	6,00	1,53	±10	-	-	-	-	-
D700−100A		7,00	1,54	±8	-		-	-	-
D800−100A		8,00	1,56	±8	-		-	-	-
Д1000−100A		10,00	1,58	±8	-		-	-	-
Д1300−100A		13,00	1,60	±8	-		-	-	-

Annex D (informative). Compliance fine assortment of fully processed steel with high magnetic induction at the quality at this standard and GOST 21427.2

Appendix E
(reference)

Table D. 1 — Compliance fine assortment of fully processed steel with high magnetic induction at the quality at this standard and GOST 21427.2

Steel grade according to this standard	Nomination Lina the thickness of rolling, mm	Magnetic properties			Mark (refer to increase) starhost 21427.2	Nomination Lina the thickness of rolling, mm	Magnetic properties
		Udel- nye magni- tnye loss, W/kg, not more	Magni- supply return scale- tion , T, not less	Anisot- rope specific magnetic losses , %, not more			Specific magnetic losses in W/kg, not more	Magnetic induction , T, not less	Anisot- rope specific magnetic losses , %, not more
Д310−50AR	0,50	3,10	1.55 V	±14	-	0,50	-	-	-
Д330−50AR		3,30	1.55 V	±14	-		-	-	-
Д350−50AR		3,50	1,59	±12	-		-	-	-
-		-	-	-	2312		3,60	1,58	±14
Д400−50AR		Of 4.00	Of 1.61	±12	-		-	-	-
Д450−50AR		4,50	1,64	±12	2215		4,50	1,64	±12
D500−50AR		5,00	1,65	±12	2213		5,00	1,65	±12
Д530−50AR		5,30	1,62	±10	-		-	-	-
D600−50AR		6,00	1,64	±10	-		-	-	-
-		-	-		2013		6,50	1,65
D700−50AR		7,00	1,66	±10	-		-	-	-
D800−50AR		8,00	1,66	±10	-		-	-	-
Д350−65АР	0,65	3,50	1,57	±12	-	0,65	-	-	-
D700−65АР		7,00	1,64	±10	-		-	-	-
D800−65АР		8,00	1,66	±10	-		-	-	-