GOST 21427.4-78
GOST 21427.4−78 Tape cold-rolled steel electrical anisotropic. Specifications (with Amendments No. 1, 2)
GOST 21427.4−78
Group B34
INTERSTATE STANDARD
TAPE COLD-ROLLED STEEL ELECTRICAL ANISOTROPIC
Specifications
Cold rolled steel electrical anisotropic strip. Specifications
ISS 77.140.50
OKP 12 3000
Date of introduction 1979−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR
2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from
3. REPLACE GOST 9925−61 in terms of thickness from 0.05 to 0.20 mm
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
The item number, app |
| GOST 8.377−80 |
Annex 1 |
| GOST 1341−97 |
6.1.2 |
| GOST 2991−85 |
6.1.2 |
| GOST 7566−94 |
4.1; 4.4; 6.1 |
| GOST 8828−89 |
6.1.2 |
| GOST 9396−88 |
6.1.2 |
| GOST 10354−82 |
6.1.2 |
| GOST 12119.0−98 — GOST 12119.8−98 |
5.5; 5.11 |
| GOST 14192−96 |
6.2 |
| GOST 14253−83 |
6.1.2 |
| GOST 20799−88 |
6.1.2 |
| GOST 21650−76 |
6.1.5 |
| GOST 24597−81 |
6.1.5 |
5. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)
6. EDITION with Amendments No. 1, 2 approved in may 1985, may 1990 (IUS 8−85, 8−90), Amended (ICS 9−2000, 3−2002)
This standard applies to cold rolled anisotropic tape thickness of 0.05 to 0.15 mm in electrical steel, designed for magnetic circuits of electrical apparatus and appliances.
1. CLASSIFICATION AND GRADES
1.1. The tape is manufactured from steel grades: 3421, 3422, 3423, 3424 and 3425.
Classification and designation of trademarks according to NTD.
1.2. Steel classification:
heat treatment:
heat-treated,
without heat treatment (nagaremono) — BTO;
by type of coating:
with heat-resistant insulating coating — ET,
uncoated — BP.
2. ASSORTMENT
2.1. Thickness, tape width, and the minimum weight of a roll depending on the grade of steel specified in table.1.
Table 1
| Tape width, mm |
Coil weight, kg, not less, when the thickness of tape, mm | ||
| 0,05 |
0,08 |
0,15 | |
| Steel grade | |||
| 3421, 3422, 3423, 3424, 3425 | |||
| 5,0 |
0,08 |
0,10 |
0,20 |
| 6,5 |
0,10 |
0,15 |
0,30 |
| 8,0 |
0,10 |
0,20 |
0,30 |
| 10,0 |
0,35 |
0,50 |
1,80 |
| 12,0 |
0,45 |
1,20 |
2,0 |
| 12,5 |
0,45 |
1,20 |
2,0 |
| 15,0 |
0,50 |
1,40 |
3,5 |
| 16,0 |
0,60 |
1,50 |
4,0 |
| 20,0 |
0,70 |
1,80 |
5,0 |
| 25,0 |
0,90 |
2,3 |
6,0 |
| 28,0 |
Of 1.00 |
2,6 |
6,0 |
| 30,0 |
Of 1.00 |
2,6 |
6,0 |
| 32,0 |
1,10 |
3,0 |
6,0 |
| 35,5 |
1,25 |
3,0 |
6,0 |
| 40,0 |
1,40 |
3,5 |
7,0 |
| 50,0 |
- |
4,0 |
9,0 |
| 64,0 |
- |
6,0 |
15,0 |
| 71.0 per |
- |
6,5 |
16,0 |
| 80,0 |
- |
- |
18,0 |
Notes:
1. The tape width is 12.0 mm and the ribbon of steel grade 3421 in new developments is not recommended.
2. By agreement with the consumer allowed to produce the tape with other dimensions.
(Changed edition, Rev. N 1).
2.2. The tape roll must consist of one segment. It is allowed to deliver bales of lesser weight, but not less than 20%, from specified in tab.1, in an amount of not more than 25% of the mass supply of the products.
2.3. Maximum deviations in thickness and the width of the tape shall not exceed that specified in table.2.
Table 2
mm
| Thickness |
Limit deviation on thickness |
Width |
Limit deviation width |
| 0,05 |
-0,010 | ||
| 0,08 |
±0,010 |
From 5.0 to 80,0 |
-0,3 |
| 0,15 |
±0,015 |
(Changed edition, Rev. N 1).
2.4. The tape supplied with obraznymi edges. By agreement with the consumer allowed to put tape neobreznye edges.
2.5. The camber of the tape, 1 m of length shall not exceed:
5 mm when the strip width up to 15 mm, inclusive;
4 mm — if the width of the tape more than 15 to 30 mm, inclusive;
3 mm — if the width of the tape more than 30 mm.
Examples of symbols
Tape with a thickness of 0.08 mm, a width of 10 mm, heat-treated (IT) with heat resistant insulating coating (FLOOR), steel grade 3422:
Tape 0,08х10 SOMETHING AT 3422 GOST 21427.4−78
The same thickness of 0.15 mm, a width of 64 mm, heat-treated (IT), uncoated (BP), of steel grade 3424:
Tape 0,15х64-THE-BP-3424 GOST 21427.4−78
The same thickness of 0.05 mm, a width of 40 mm, without heat treatment (RTA), of steel grade 3421:
Tape 0,05х40-BTO-3421 GOST 21427.4−78
3. TECHNICAL REQUIREMENTS
3.1. Tape cold-rolled steel electrical anisotropic shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.
3.2. The tape should be heat-treated, at the request of the consumer without heat treatment.
3.1, 3.2. (Changed edition, Rev. N 1).
3.3. Heat-treated tape is manufactured with heat resistant insulating coating or without coating.
3.4. The tape surface should be smooth, without rust, crumpled surface and peeling of film.
On the surface of the tape allowed dents, fingerprints, small risks, scratches and light nabesna a depth or height not exceeding half of the limit deviations on thickness, the coating powders and the oxide film, preventing the application of electrical insulation.
On the surface of the tape with electrical insulating coating patina of powdery substances is not allowed.
3.5. On the edges of the belt should not be delamination and other defects, bringing the ribbon over the limit deviations on width. On the edges of the belt allowed the burrs with the size not exceeding the limit deviations on thickness.
3.6. The number of bends of the tape, made in heat treated condition shall be those specified in table.3.
Table 3
| Steel grade |
The arithmetic mean and minimum (in parentheses) the number of bends of the strip thickness, mm, not less | |
| 0,05−0,08 |
0,15 | |
| 3422, 3423, 3424, 3425 |
5 (2) |
5 (2) |
| 3421 |
5 (2) |
5 (2) |
(Changed edition, Rev. N 1).
3.7. The magnetic properties of the tape must conform to the standards specified in table.4.
Table 4
| Steel grade |
Thickness, mm |
Specific losses in W/kg, not more |
The coercive force HC, A/m·10 |
Magnetic induction, T, not less, in magnetic field, A/m | ||||||
| 0,15 |
23,0 |
- |
0,34 |
0,50 |
0,80 |
1,10 |
1,30 |
1,45 |
1,70 | |
| 3421 |
0,08 |
22,0 |
- |
0,36 |
0,40 |
0,75 |
1,10 |
1,25 |
1,45 |
1,70 |
| 0,05 |
- |
24 |
- |
0,40 |
0,75 |
1,10 |
1,25 |
1,45 |
1,70 | |
| 0,15 |
20,0 |
- |
0,32 |
0,60 |
0,95 |
1,25 |
1,40 |
1.55 V |
1,75 | |
| 3422 |
0,08 |
19,0 |
- |
0,32 |
0,55 |
0,90 |
1,25 |
1,35 |
1.55 V |
1,75 |
| 0,05 |
- |
24 |
- |
0,55 |
0,90 |
1,25 |
1,35 |
1.55 V |
1,75 | |
| 0,15 |
19,0 |
- |
0,26 |
0,80 |
1,10 |
1,40 |
1.55 V |
1,65 |
Of 1.82 | |
| 3423 |
0,08 |
17,0 |
- |
0,28 |
0,80 |
1,05 |
1,40 |
1,50 |
1,65 |
Of 1.82 |
| 0,05 |
- |
22 |
- |
0,80 |
1,05 |
1,40 |
1,50 |
1,65 |
Of 1.82 | |
| 0,15 |
18,0 |
- |
- |
0,80 |
1,10 |
1,40 |
1.55 V |
1,65 |
Of 1.82 | |
| 3424 |
0,08 |
16,0 |
- |
- |
0,80 |
1,10 |
1,40 |
1.55 V |
1,65 |
Of 1.82 |
| 0,05 |
- |
22 |
- |
0,80 |
1,10 |
1,40 |
1.55 V |
1,65 |
Of 1.82 | |
| 0,15 |
17,0 |
- |
- |
1,10 |
1,35 |
1,50 |
1,65 |
1,75 |
Of 1.82 | |
| 3425 |
0,08 |
15,0 |
- |
- |
1,05 |
1,30 |
1,50 |
1,65 |
1,75 |
Of 1.82 |
| 0,05 |
- |
20 |
- |
1,05 |
1,30 |
1,50 |
1,65 |
1,75 |
Of 1.82 | |
Note. For steel of all grades normalized basic characteristics are specific losses and magnetic induction in magnetic field of 2500 A/m. At customer’s request, check the magnetic induction at any one value of magnetic field intensity.
(Changed edition, Rev. N 1, 2, Amendment 3−2002 IUS).
3.8. The ageing factor of steel (the percentage increase in the specific loss in the specimen after aging) should not exceed 6%.
3.9. Heat-resistant electrically insulating coating on the tape must satisfy the following requirements:
thickness on one side of the tape should be not more than 0.005 mm (5 microns);
coefficient of resistance — not less than 8 Ω·cm;
does not flake off on the outside when bending the sample 90° around mandrel of diameter of 10 mm Allowed cracks in the bend;
to maintain electrical insulation properties after aging at the temperature (800±10) °C for 3 h in neutral atmosphere or after aging at a temperature of (820±10) °C for 2.5 min in air.
(Changed edition, Rev. N 1).
3.10. At the request of the consumer tape supplied with a definition:
the coercive force and the specific losses in induction of 1.0 T and frequency of 400 Hz for steel grades 3424 and 3425;
magnetic properties not listed in table.4.
The results indicate in the document about quality.
3.11. At the customer’s request tape thickness 0.1 mm of steel grade 3421 manufactured with magnetic properties corresponding to the thickness of 0,08 mm.
3.12. Density, specific electrical resistance and other magnetic properties of the steel are given in Appendix 1.
Theoretical weight of 1 m of the tape is given in Appendix 2.
4. ACCEPTANCE RULES
4.1. The tape shall be made by the parties consisting of strips melting one, same brand, same size in thickness and one mode of annealing, and accompanied by a document of quality in accordance with GOST 7566 with the addition of: «the mode of heat treatment of the tape».
(Changed edition, Rev. N 1).
4.2. To check sizes, camber, surface quality and edges, magnetic properties, electrical insulating properties of the coating and testing the inflection of each party taken one roll.
4.3. Ratio test of aging and the determination of the sound insulating properties of the coating after additional heating, the manufacturer conducts periodic.
4.4. If unsatisfactory validation results at least one of the indicators, it conducted a re-review on a sample selected according to GOST 7566.
5. TEST METHODS
5.1. To control the size, camber, surface quality, edges, determining the magnetic properties, electrical insulating properties of the coating and testing the inflection of each control coil select two segments from the beginning and end of the roll.
5.2. Tape dimensions and size of burrs check measuring tools that provide required accuracy of measurement. The thickness of tape determines the measuring instrument with division value not more than 1 µm in width, with a scale division of 0.5 mm.
The thickness of the tape measure at the beginning and at the end of the roll at a distance of not less than 3 mm from the edge. The thickness of the insulating coating is not included in the size of the ribbon thickness.
(Changed edition, Rev. N 2).
5.3. To determine camber check the portion of the tape is freely placed on a flat surface. The measurement is performed in the place of greatest curvature by applying a line length of 1 m to the concave side of the tape (or overlapping edges of tape sample length of 1 m with a straight line) and determining the greatest distance from the tape line or a straight line.
5.4. The test bend is carried out on four samples having a width of 30 mm, cut out for no apparent burrs and strips less than 30 mm samples are equal to the width of the tape.
Samples cut along the direction of rolling and are not subjected to additional annealing. The test is carried out in a vise with a radius of curvature of the jaws 1 mm.
During the test shall be provided with a permanent adhesion of the sample and the surface of the jaws. One bend is the bend specimen from the initial position in one direction by 90° and reverse to straighten up to the starting position. The destruction of the sample is considered failure of the specimen or a crack of any length. The resulting value is the number of bends round to the nearest integer or poluslova of inflection.
For test result take the average excesses of three samples. The test is carried out at a temperature of 15−35 °C.
(Changed edition, Rev. N 1).
5.5. Manufacturer of ring specimens and the measurement of magnetic properties of steel to produce the churchyard 12119.0 — GOST 12119.8 on two samples.
The dimensions of ring specimens shall be as specified in table.5.
When coiling specimens are not allowed technological impact on the tape, leading to tensile stresses more than 108 MPa (11 kgf/mm).
Allowed determination of the magnetic properties of other methods or on other samples, while ensuring the required accuracy of measurement.
If there are differences in the magnetic properties is determined on ring samples according to GOST 12119.0 — GOST 12119.8.
Table 5
| Nominal tape thickness, mm |
Tape width for sample making, mm |
The length of the tape for the manufacture of samples, m |
Inner diameter ring sample, mm |
| 0,05 |
25,6 | ||
| 0,08 |
10 |
16,0 |
50 |
| 0,15 |
8,5 |
Note. Testing is allowed on samples having a width of from 10 to 20 mm, made of strips of appropriate width without extra cutting.
(Changed edition, Rev. N 1, 2).
5.6. Samples annealed strip before determining the magnetic properties should be subjected to annealing to relieve work hardening of the recommended modes:
for bands astanovsky samples heating at a temperature of 800−820 °C aged from 2.5 to 10 minutes in an atmosphere protecting against oxidation, or exposure to 3 min in air;
for the ribbon of steel grades 3421, 3422, 3423, 3424 and 3425 — heating in the atmosphere protecting from contamination (hydrogen, inert gas, vacuum with residual pressure not higher than 13 PA (10mm RT.St.), to 750−850 °C, exposure from 1 to 4 h, cooling at a speed of not more than 500 °C/h to 200 °C, then arbitrarily; in preparation for annealing the ring of twisted samples from tape without insulating coating on the surface of the tape should be applied a heat-resistant covering, insulating the coils of the specimen from each other;
for the ribbon of steel grades 3421, 3422, 3423, 3424 and 3425 with insulating coating — heating of the neutral gas in the vacuum up to 750−850 °C, exposure from 1 to 4 h, cooling at a speed of not more than 500 °C/h to 200 °C, then arbitrarily.
5.7. Samples of work-hardened strip before determining the magnetic properties is subjected to annealing regime: heating in a vacuum with residual pressure less than 1.3 PA (10mm RT.St.) or in a pure dry hydrogen with a dew point not above -50 °C and 1100−1150 °C, an excerpt of not more than 6 h, cooling at a speed of not more than 200 °C/h to 200 °C, then arbitrarily.
In the preparation of the ring of twisted samples to the annealing to the surface of the tape should be applied a heat-resistant covering, insulating the coils of the specimen from each other.
5.6, 5.7. (Changed edition, Rev. N 1).
5.8. The ageing factor determined on samples taken to determine the magnetic properties after heating them for 120 h at 120 °C.
The ageing factor (a) percentage calculated by the formula
where and
— the values of specific losses measured before and after aging W/kg.
5.9. To determine the adhesive strength of the insulating coating with the metal selected sample of 30 mm wide or equal to the width of the tape. The sample is tightly pressed against the rod 10 mm in diameter and smoothly bent 90° around the web.
5.10. The thickness of the insulating coating is determined by the thickness of electromagnetic or other system that allows to measure with an accuracy of ±1 µm.
5.11. The electrical resistance of insulating coatings is determined according to GOST 12119.0 — GOST 12119.8.
5.12. The condition of the belt surface check visually.
6. MARKING, PACKAGING, TRANSPORTATION AND STORAGE
6.1. Marking, packaging, transportation and storage — by GOST 7566 with the following additions.
6.1.1. The tape should be in rolls or bundles of rolls. Roll weight up to 100 kg, inclusive, bundles of rolls up to 120 kg inclusive. Outer diameter is not more than 500 mm.
Is permitted to wind in a roll of some of the tapes of the party, the number of separate strips of length not less than 10 m must not exceed 5% of the batch weight.
Allowed the rolls of tape width up to 50 mm, inclusive, to tie in bundles no shims under the condition that the total height of all coils does not exceed 100 mm.
6.1,
6.1.2. For protection against corrosion tape is applied to industrial oil according to GOST 20799 allowed the use of inhibitory additives. Allowed the use of other neutral oil that protects the metal from corrosion.
The rolls of tape with electrical insulating coating must not be covered by industrial oil.
Each roll bundles tied with at least three radial studs and packaged in waterproof paper GOST 8828 or paper of the «parchment» churchyard 1341 by one toroidal winding or wraps. Rolls on tape inside diameter less than 100 mm are allowed to be Packed without radial studs. May be replaced with radial studs on the mounting of the outer and inner coils of the adhesive polymer tape.
Bundle of roll Packed in wrapping cloth or polyethylene film according to GOST 10354 or container holstoproshivny cloth GOST of 14,253, nonwovens, and stitched a flap of waste textile industry or other types of packaging materials according to the current normative-technical documentation, with the exception of cotton and linen fabrics.
Coils and bundles of coils is allowed to pack a removable polymeric coating.
Coils and bundles of coils are placed in wooden boxes type I or type II according to GOST 2991 or boxes of the collapsible or folding design according to GOST 9396 or other regulatory-technical documentation.
Weight (gross weight) load — 130 kg.
(Changed edition, Rev. N 1, 2).
6.1.3. On the label attached to the roll or to the end of the box (if packing rolls into boxes), must be applied:
trademark of the manufacturer;
batch number;
the room melt;
steel grade;
the weight of the batch;
the size of the tape;
stamp of technical control.
6.1 4. (Deleted, Rev. N 1).
6.1.5. Transportation is carried out by all kinds of transport in covered vehicles in accordance with the rules in force in each mode of transport.
The tape transport by rail is carried in covered wagons or carload small shipments or in containers in accordance with the rules of transportation of cargo and conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.
When you ship two or more packages to one user should be consolidation packages in accordance with the requirements of GOST 24597 and GOST 21650.
(Changed edition, Rev. N 1, 2).
6.2. Transport marking under GOST 14192 with the indication of the manipulation of signs «Keep away from moisture», «Top». Marking color on the stencil and must be black on a light ground and Vice versa. Allowed to affix the marking printed on a label that is glued to the box.
6.3. Products must be stored in a dry heated room at a temperature 1 to 30 °C and relative humidity not more than 1.95% in the absence of alkaline, acidic and other aggressive contaminants.
6.2, 6.3. (Added, Rev. N 1).
ANNEX 1 (reference). Mass fraction of silicon, density, electrical resistivity and magnetic properties of alloys in the different modes of magnetization
ANNEX 1
Reference
| Steel grade |
Mass fraction of silicon, % |
The density of steel, kg/m |
Electrical resistivity, Ohm·m·10 |
| 3421, 3422, 3423, 3424, 3425 |
2,8−3,8 |
7650 |
0,50 |
On the heck.1−6 shows the data on the magnetic properties of a thin strip of electrical steel at constant and variable fields.
The data in the constant field magnetization was obtained by a ballistic method according to GOST 8.377.
The data in the magnetization variable fields were obtained by induction.
Legend:and
— magnetic induction and magnetic field when magnetized by a constant field;
and
the maximum value of induction and the effective value of the magnetic field when the magnetization alternating field;
— specific losses on alternating magnetization.
Damn.1. Curves of magnetization grade steel 3424 (Э360А)
Curves of magnetization grade steel 3424 (Э360А)
and — 0.08 mm thickness
b — thickness of 0.15 mm
Damn.1
Damn.2. Curves of magnetization grade steel 3425 (Э360АА)
Curves of magnetization grade steel 3425 (Э360АА)
but — 0.05 mm thickness
b — 0.08 mm thickness
in thickness 0.15 mm
Damn.2
Damn.3. Curves of magnetization grade steel 3424 (Э360А) frequency: 1 — 400 Hz 2 — 1000 Hz; 3 — 3000 Hz
Curves of magnetization grade steel 3424 (Э360А) frequency: 1 — 400 Hz 2 — 1000 Hz; 3 — 3000 Hz
as for tape thickness 0.08 mm
b — for tape thickness of 0.15 mm
Damn.3
Damn.4. Curves of magnetization grade steel 3425 (Э360АА) frequency: 1 — 400 Hz 2 — 1000 Hz; 3 — 3000 Hz
Curves of magnetization grade steel 3425 (Э360АА) frequency: 1 — 400 Hz 2 — 1000 Hz; 3 — 3000 Hz
and for strips of thickness 0.05 mm
b — for tape with a thickness of 0.08 mm
in for a tape thickness of 0.15 mm
Damn.4
Damn.5. The dependence of the losses from induction for steel grade 3424 (Э360А)
The dependence of the losses from induction for steel grade 3424 (Э360А) at frequency: 1 — 400 Hz 2 — 1000 Hz; 3 — 3000 Hz
as for tape thickness 0.08 mm
b — for tape thickness of 0.15 mm
Damn.5
Damn.6. The dependence of the losses from induction for steel 3425 (Э360АА)
The dependence of the losses from induction for steel 3425 (Э360АА) at frequency:1 — 400 Hz 2 — 1000 Hz; 3 — 3000 Hz
and for strips of thickness 0.05 mm
b — for tape with a thickness of 0.08 mm
in for a tape thickness of 0.15 mm
Damn.6
ANNEX 2
Reference
ANNEX 2 (informative). Theoretical weight of 1 m of tape
| Tape width, mm |
Weight of 1 m of ribbon, d, thickness, mm | ||
| 0,05 |
0,08 |
0,10 | |
| 5,0 |
Of 1.91 |
3,06 |
3,83 |
| 5,6 |
2,14 |
3,43 |
4,28 |
| 6,3 |
2,41 |
3,86 |
4,82 |
| 6,5 |
2,49 |
Of 3.98 |
4,97 |
| 7,1 |
Of 2.72 |
4,35 |
5,43 |
| 8,0 |
3,06 |
4,90 |
6,12 |
| 9,0 |
3,44 |
5,51 |
6,89 |
| 10,0 |
3,83 |
6,12 |
7,65 |
| 11,2 |
4,28 |
6,85 |
8,57 |
| 12,0 |
Of 4.59 |
Of 7.34 |
Of 9.18 |
| 12,5 |
4,78 |
7,65 |
9,56 |
| 14,0 |
5,36 |
8,57 |
To 10.71 |
| 15,0 |
5,74 |
Of 9.18 |
Of 11.48 |
| 16,0 |
6,12 |
Of 9.79 |
12,24 |
| 18,0 |
6,89 |
11,02 |
13,77 |
| 20,0 |
7,65 |
12,24 |
15,30 |
| 22,4 |
8,67 |
13,71 |
A 17.14 |
| 25,0 |
9,56 |
15,80 |
19,13 |
| 28,0 |
To 10.71 |
A 17.14 |
21,31 |
| 30,0 |
11,49 |
18,36 |
22,96 |
| 32,0 |
12,24 |
19,58 |
24,48 |
| 35,5 |
13,58 |
21,73 |
27,16 |
| 40,0 |
15,30 |
24,48 |
30,60 |
| 45,0 |
Of 17.21 |
27,54 |
34,43 |
| 50,0 |
19,13 |
30,60 |
A 36.25 |
| 56,0 |
21,42 |
34,27 |
42,84 |
| 64,0 |
Of 24.10 |
38,62 |
48,20 |
| 71.0 per |
27,16 |
43,52 |
54,32 |
| 80,0 |
- |
- |
- |
Note. Theoretical weight of 1 m of the tape is computed from the density of the steel of 7.65 g/cm.
