GOST 10885-85

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  ГОСТ 10885-85

GOST 10885−85 Steel sheet hot-rolled dual-layer corrosion-resistant. Specifications (with Change No. 1)

GOST 10885−85

Group B33

INTERSTATE STANDARD
STEEL SHEET HOT-ROLLED DUAL-LAYER CORROSION-RESISTANT
Specifications
Hot-rolled corrosion-resistant clad steel sheets. Specifications

OKP 09 9500

Date of introduction 1986−07−01

INFORMATION DATA

1. DEVELOPED 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 26.08.85 N 2729

3. REPLACE GOST 10885−75

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	Item number
GOST 380−94	2.2, 2.6
GOST 492−73	2.4
GOST 1050−88	2.2
GOST 1497−84	4.11
GOST 1577−93	2.6, 2.9
GOST 5520−79	2.2, 2.6, 2.9
GOST 5521−93	2.9, 2.17, 2.18, 4.14
GOST 5632−72	1, 3, 2.4
GOST 6032−89	4.5, 4.13
GOST 6689.1−92	4.1
GOST 6689.2−92	4.1
GOST 6689.3−92	4.1
GOST 6689.4−92	4.1
GOST 6689.5−92	4.1
GOST 6689.6−92	4.1
GOST 6689.7−92	4.1
GOST 6689.8−92	4.1
GOST 6689.9−92	4.1
GOST 6689.10−92	4.1
GOST 6689.11−92	4.1
GOST 6689.12−92	4.1
GOST 6689.13−92	4.1
GOST 6689.14−92	4.1
GOST 6689.15−92	4.1
GOST 6689.16−92	4.1
GOST 6689.17−92	4.1
GOST 6689.18−92	4.1
GOST 6689.19−92	4.1
GOST 6689.20−92	4.1
GOST 6689.21−92	4.1
GOST 6689.22−92	4.1
GOST 6689.24−92	4.1
GOST 7268−82	4.12
GOST 7564−97	4.4
GOST 7565−81	3.6
GOST 7566−94	3.1, 3.8, 5.1
GOST 9454−78	4.12
GOST 10243−75	4.4, 4.8
GOST 12344−88	4.1
GOST 12345−2001	4.1
GOST 12346−78	4.1
GOST 12347−77	4.1
GOST 12348−78	4.1
GOST 12349−83	4.1
GOST 12350−78	4.1
GOST 12351−81*	4.1
_______________ * On the territory of the Russian Federation GOST 12351−2003. — Note the manufacturer’s database.
GOST 12352−81	4.1
GOST 12353−78	4.1
GOST 12354−81	4.1
GOST 12355−78	4.1
GOST 12356−81	4.1
GOST 12357−84	4.1
GOST 12362−79	4.1
GOST 12363−79	4.1
GOST 12364−84	4.1
GOST 12365−84	4.1
GOST 14019−80	4.9
GOST 14637−89	2.6, 2.9
GOST 19281−73	2.2, 2.3, 2.6
GOST 19903−74	1.4, 1.5, 4.3
GOST 20072−74	2.2, 2.3
GOST 22727−88	4.15
GOST 24982−81	4.13
GOST 26877−91	4.3
GOST 28473−90	4.1

5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

6. EDITION with Change No. 1, approved in September 1988 (IUS 1−89)


This standard applies to hot-rolled dual-layer corrosion-resistant sheets with a base layer of carbon or low-alloy steel and cladding layer of corrosion-resistant steels and alloys, Nickel and Monel.

1. ASSORTMENT

1.1. Steel classification:

— the thickness of the corrosion-resistant layer on normal and high — K;

— continuity of adhesion layers on classes 01, 0, 1, 2, 3.

The thickness of the corrosion-resistant layer and class sheets at the denseness of the adhesion layers is indicated in the order.

1.2. Two-layer sheets are produced in thickness from 4 to 60 mm. By agreement between manufacturer and consumer two-layer sheets are produced with thickness over 60 to 120 mm. the thickness of the sheets and corrosion-resistant layer is specified in table. 1.

Sheet thickness St 60 to 120 mm thick corrosion-resistant layer is determined by agreement between manufacturer and consumer.

Table 1

In millimeters

The thickness of the sheet	The thickness of the corrosion-resistant layer
	normal	increased
4	0,7−1,1	-
5	0,8−1,2
6	1.0 to 1.6
7	1,2−1,8
8, 9	2.0 to 3.0
10, 11, 12, 13, 14, 15	2.0 to 3.0	For 3.0−4.0
16, 17, 18, 19, 20, 21	2,5−3,5
22, 24, 25, 26	For 3.0−4.0	-
28, 30	3,5−5,0
32, 34, 36, 38, 40, 42, 45, 48, 50, 52, 55, 60	4,0−6,0

1.1, 1.2. (Changed edition, Rev. N 1).

1.3. The length and width of a double-layer sheets shall conform to the requirements of table.2.

Allowed up to 20% of leaves from the mass of the party with deviations in length of up to 30%.

Measuring the length within the limits specified in table.2, establish at the request of the consumer.

Table 2

In millimeters

The thickness of the sheet	Minimum and maximum sheet length with a width of
	1200	1300	1400	1500	1600	1700	1800	1900	2000	2100	2200	2300	2400	2500	2600	2700	2800
4; 5	4000	4000	4000	4000	4000	4000	-	-	-	-	-	-	-	-	-	-	-
	6000	6000	6000	6000	6000	6000
6; 7	4000	4000	4000	4000	4000	4000
	6000	6000	6000	6000	6000	6000
8, 9, 10	4000	4000	4000	4000	4000	4000
	7500	7600	7000	7000	6700	6300
11, 12, 13	4000	4000	4000	4000	4000	4000
	7100	7600	7000	6600	7500	7000
14, 15, 16, 17	4500	4500	4000	4000	4000	3700
	6300	7700	7200	7000	6600	7200
18, 19, 20, 21, 22, 24, 25	4300	4000	4000	3000	3200	3700		3600	3400	3300	3300	3400	3300	3400	3300	3300	3500
	6000	7200	6700	6200	5800	5500		8400	7900	7500	7100	6800	6500	6300	6100	5900	5700
26, 28, 30, 32, 34, 36, 38, 40	-	-	4400	4100	3800	3600	3400	3200	3300	3200	3300	3200	3300	3300	3300	3300	3300
			9400	8800	8300	7800	7400	7000	6600	6300	6000	5700	5500	5300	5100	4900	4700
42, 45, 48, 50			-	4000	3600	3400	3200	3200	3300	3200	3200	3300	3200	3300	3400	3300	-
52, 55, 60				6200	5800	5500	5200	4900	4700	4500	4300	4100	3900	3700	3500	3400

1.4. Maximum deviations in thickness of the sheets must comply with:

for sheets made batch by rolling with a thickness of 4 to 7 mm incl. and for sheets of all thicknesses obtained by other methods — according to GOST 19903, normal accuracy of rolling;

for sheets with thickness from 8 to 60 mm incl., produced by the method of batch rolling, the requirements table.3;

Table 3

In millimeters

The thickness of the sheet	Pred. OTK.
8	±0,8
9, 10	±0,9
11	±1,0
12, 13, 14	±1,1
15, 16, 17	±1,2
18, 19	±1,3
20, 21, 22	±1,4
24, 25	±1,5
26	±1,6
28	±1,7
30, 32	±1,8
34, 36	±1,9
38, 40	±2,0
42	±2,1
45	±2,2
48	±2,3
50, 52	±2,4
55, 60	±2,5

for sheets with a thickness of over 60 to 120 mm according to agreement between manufacturer and consumer.

(Changed edition, Rev. N 1).

1.5. Limit deviations of the length and width of leaves and the cut end Squareness, mm — according to GOST 19903. For two-layer sheets manufactured by the batch rolling, is allowed to exceed extreme deviations in length and width to the standards set for the double thickness of the sheet.

1.6. The deviation from flatness of 1 m long two-layer sheets with thickness of 8 mm should not exceed 15 mm. For sheets with thickness less than 8 mm the deviation from flatness shall not exceed 20 mm.

Example of designation double-layer sheet steel with a thickness of 8 mm, a width of 1500 mm and a length of 6000 mm with a base layer of steel grade st3sp, category 2 according to GOST 14637 and corrosion-resistant layer of steel 12X18H10T according to GOST 5632, without testing the adhesion of layers with increased thickness of the corrosion-resistant layer:

Same for double-layer sheet steel with a thickness of 20 mm, width 1400 mm and length of 4000 mm with a base layer of steel grade 16GS, category 3 according to GOST 5520 and corrosion-resistant layer of 08KH13 steel grade according to GOST 5632, class of continuity of the bonding layers 2, with normal thickness of corrosion-resistant layer:

(Changed edition, Rev. N 1).

2. TECHNICAL REQUIREMENTS

2.1. Two-layer sheets are produced in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

Two-layer sheets made from combinations of grades of steel core and cladding layers as shown in table.4 «+"sign.

Table 4

Steel grade cladding layer	Steel grade base layer
	St3sp	10	20K	09Г2	16GS	09G2S	10KHSND	10KHGSN1D	12MKH	12KHM	10KH2M1
08KH13	+	-	+	+	+	+	-	-	+	+	-
08KH17T				-	-	-			-	-
15KH25T
08KH18N10T					+	+	+		+	+	+
12KH18N10T				+				+			-
10X17H13M2T				-			-	-	-	-
10X17H13M3T
08KH17N15M3T						-
08KH22N6T					-
06HN28MDT					+
KHN65MV, KHN65MVU	-		-
N70MFV-VI
Monel Nmzhmts 28−2,5−1,5	+		+		-
Nickel NP-2		+	-

Note. Two-layer plates with a combination of layers that are not marked with a+, are made by agreement between manufacturer and consumer.

2.2. The chemical composition of steel grades the base layer must conform to the requirements of the following standards:

St3sp GOST 380−88*;
______________
* On the territory of the Russian Federation GOST 380−2005. — Note the manufacturer’s database.

10 — the GOST 1050−88;

20K, 12KHM — GOST 5520;

16GS, 09G2S, 09Г2, 10KHSND — GOST 19281−89;

12MKH — GOST 20072.

2.3. Chemical composition steel grades and 10KHGSN1D 10KH2M1 should match the table.5.

Table 5

Steel grade base layer	Mass fraction of elements, %
	Carbon	Silicon	Manganese	Chrome	Nickel	Molybdenum	Copper	Sulfur	Phosphorus
								no more
10KHGSN1D	Not more than 0.12	0,70−1,00	0,50 — 0,90	0,40−0,70	1,30−1,60	-	0,30−0,60	0,035	0,035
10KH2M1	0,08−0,12	0,17−0,37	0,30−0,60	2,00−2,50	Not more than 0,50	Of 0.90−1.10	-	0,030	0,030

Notes:

1. In steel brand 10KHGSN1D permitted processing aid titanium.

2. Ready to hire can be deviations in chemical composition for steel grade 10KHGSN1D in accordance with GOST 19281−89, 10KH2M1 steel grade according to GOST 20072.

2.4. The chemical composition of the steel cladding of the layer must match trebovaniye 5632, Nickel brand NP-2 and Manila brand Nmzhmc28−2,5−1,5 — GOST 492*.
______________
* On the territory of the Russian Federation GOST 492−2006. — Note the manufacturer’s database.

2.5. Two-layer sheets are produced thermally processed. Type and mode of heat treatment sets the manufacturer. Allowed to produce sheets without heat treatment, provided that the specified properties.

2.6. The mechanical properties of two-layer sheets shall conform to the requirements of the standards for the steel grades of the base layer:

St3sp categories 2−6 — GOST 14637−89;

20K categories 2−5; 10 and 11, brands 16GS and 09G2S categories 2−9 and 17 — GOST 5520;

09Г2 and 10KHSND categories 2−6; 10 and 11 — GOST 19281−89;

10 — GOST 1577;

12KHM categories 2, 3 and 16 — GOST 5520.

For two-layer sheets obtained by the method of batch rolling, allowed the decline in standards for yield strength against the norms given in the above standards, by 9.81 H/mm(1 kgf/mm).

For sheets of 8 mm thickness and less with the core layer of carbon steel upper value of the temporary resistance not normalized.

The toughness of the base layer at normal and reduced temperatures normalized to the two-layer sheets with thickness 10 mm or more, and after mechanical aging — 12 mm and more.

For double-layer sheets with a thickness of 16 mm or more with a base layer of steel 10KHSND in the impact strength at a temperature of minus 70 °C is determined by agreement between manufacturer and consumer, and at a temperature of minus 40 °C should not be less than 294 j/cm(3 kgf · m/cm).

(Changed edition, Rev. N 1).

2.7. The mechanical properties of two-layer sheets with a base layer of steel grades 10KHGSN1D, 12MKH and 10KH2M1 must conform to the standards specified in table.6.

Table 6

Main steel grade layer	The thickness of sheet, mm	The yield stress , H/mm(kgf/mm)	Temporary resistance H/mm(kgf/mm)	Elongation , %	Toughness at + 20 °C, KCU, j/cm(kgf ·m/cm)
		not less than
10KHGSN1D	5−10	440 (45)	550 (56)	16		-
10KH2M1	30−60	235 (24)	440 (45)	19		784 (8)
12MKH	12−40	221 (22,5)	420 (43)	24		588 (6)

2.8. A plating layer of steel grades 08KH17T, 15KH25T, 08KH18N10T, 12KH18N10T, 10X17H13M2T, 10H17N13MZT, 08KH17N15M3T, 08KH22N6T and grades 06XH28MDT, N70MFV-VI, KHN65MV, KHN65MVU should not be prone to intergranular corrosion.

2.9. The surface of the core layer and edges of the bilayer sheet shall conform to the requirements of GOST 14637, GOST 5520 GOST 5521, GOST 1577 for sheet products.

2.10. The surface corrosion-resistant layer of two-layer sheets must have scale, smoothed out bubbles, laminated shells, cracks (rolled and grinding). Defects should be removed with gentle cleaning, the depth of which should take the thickness of the corrosion-resistant layer at its minimum value.

Allowed without Stripping individual fingerprints, scratches, risks, rabiza, not deducing the thickness of the sheets and corrosion-resistant layer negative maximum deviations, as well as traces of the separation layer in a batch method for the production of two-layer sheets.

At the customer’s request sheets are produced without a trace of the separation layer.

By agreement with the consumer allowed the sweep to great depths or defective areas cutting of the corrosion-resistant layer and their subsequent welding. The total area of the corrected areas shall not exceed 5% of the area of the trimming sheet.

In the manufacture of sheets with etched surface traces of Pererva not allowed.

2.11. The leaves should be trimmed evenly.

2.12. For trimming edges of sheets of steel should be free of cracks and delamination.

2.13. According to the continuity of adhesion of the layers of sheets with a thickness of 8 mm shall conform to class requirements that are given in table.7.

Table 7

	Conditional square of the discontinuities, see			Conditional relative area of all take into account discontinuities of metal, %, not more
Class sheet	mini minimum-making it brings	Maxi the minimum admissible thymoma	Conditional area most permissible area of defect, m	1 m	the area of unit of sheet metal	The maximum permissible length of a conditional discontinuities, mm
01	By agreement between manufacturer and consumer
0	5	20	1,0	1,0	0,3	30 — sheet products with thickness up to 60 mm incl., 50 — sheet products with thickness over 60 mm
1	10	50	2,0	2,0	0,5	50
2	20	100		3,0	1,0	100
3	50	250	-	5,0	2,0	200

Notes:

1. The maximum allowable conventional length of discontinuities used in discrete linear scan, and to assess the continuity of the marginal areas of sheet metal.

2. The sensitivity control sets the manufacturer.

At the request of the consumer two-ply sheets izgotavleniya without control by ultrasonic method.

Double layer steel thickness 4 to 7 mm and steel made without control by ultrasonic method, must not have any visible peeling.


(Changed edition, Rev. N 1).

2.14. The macrostructure of the steel base layer should not be visible without using the magnifying devices, bundles, clusters of bubbles rolled out and rolled out of the dirt. Allowed individual smoothed out the bubbles length no more than 15 mm. In fractures allowed separation of the main layer, if the total length does not exceed 20 mm.

The macrostructure steel grade st3sp not control.

2.15. The curvature of the double layer of steel when tested on the strength of the connection layers, and ductility of the basic layer and at the request of the consumer — cladding layer should be no delamination, cracks.

2.16. Shear strength in determining the demand of the consumer the strength of the connection layers of steel with cladding coating of 2 mm or more shall be not less than 147 N/mm(15 kgf/mm).

2.17. The total area of the fracture base layer with a fibrous structure defined for steel grades 09Г2, 09G2S and 10KHSND at the request of the consumer, must comply with the requirements of GOST 5521.

2.18. Sheets with a base layer of steel grades 09Г2, 09G2S and 10KHSND in conducting at the request of the consumer bend test specimens wide must meet the requirements of GOST 5521.

3. ACCEPTANCE RULES

3.1. Steel take parties. The party must consist of sheets of one thickness, one base layer bottoms, one charge and one mode of heat treatment. The party is allowed to complete any of the sheets, varying in thickness up to 2 mm. Party of two-layer sheets heat treated in continuous furnaces, shall not exceed 75 m

The party must be accompanied by a document of quality according to GOST 7566 with the following additions:

— mark steel core and corrosion-resistant layers;

— number of melt and the chemical composition of the steel core and corrosion-resistant layers;

— the thickness of the corrosion-resistant layer;

— shear strength;

class of continuity of the bonding layers, defects recording.

(Changed edition, Rev. N 1).

3.2. Control of size, surface defects and quality of the edges is performed on each sheet.

3.3. Control of macrostructure, the thickness of the corrosion-resistant layer, tensile tests, impact bending, bending, bending wide sample, kink, slice is carried out on two leaves from the party.

At the request of the consumer the core layer of steel grades 20K, 16GS, 09G2S, 12MKH, 12KHM, 10KH2M1 and 10KHSND in sheets with a thickness of 12 mm and tested for tensile and impact bending each sheet.

3.4. The tendency of corrosion-resistant steel to intergranular corrosion is controlled on a single sheet from each heat.

3.5. Check continuity of clutch layers two-layer steel grades 01, 0, 1, 2, 3 is carried out on each sheet. Class of sheets is determined by the selection.

Check continuity of clutch layers two-layer steel with a thickness of 4 to 7 mm and steel, made without control by ultrasonic method, is performed on each sheet.

(Changed edition, Rev. N 1).

3.6. For chemical analysis samples are taken according to GOST 7565.

3.7. Chemical composition of steel shall be certified by the company, smelting metal, in the document about quality.

3.8. If unsatisfactory test results of at least one of the indicators, repeat tests performed on sample selected in accordance with GOST 7566.

4. TEST METHODS

4.1. Chemical analysis of steel and alloys is carried out according to GOST 12344−12357 GOST, GOST 12362−12365 GOST, GOST 28473 or other methods providing the required accuracy.
_______________
* On the territory of the Russian Federation GOST 12344−2003. — Note the manufacturer’s database.

Chemical analysis of Nickel brand NP-2 and Manila brand Nmims-28−2,5−1,5 spend churchyard 6689.1−6689.22 GOST, GOST 6689.24.

4.2. The quality of the surface and edges of the sheets checked visually.

4.3. The size of the sheets and the deviation from the flatness is controlled in accordance with the requirements of GOST 19903 and GOST 26877.

(Changed edition, Rev. N 1).

4.4. Samples for tests in bending, tension and impact bending are selected in accordance with the requirements of GOST 7564, and tested to breaking — GOST 10243.

4.5. From each selected for control select sheet:

for tensile tests — one sample;

for testing the impact strength of the sample for each temperature;

for testing the impact strength after mechanical aging — three of the sample;

for bending test, two sample, and with the thickness over 30 mm — three samples;

to control the plasticity of corrosion-resistant layer four of the sample;

for flexure testing wide samples — one sample;

— testing the kink — one sample;

— to test cut or two of the sample;

— to check the thickness of the corrosion-resistant layer or two of the sample;

— to assess the macrostructure of one sample.

To test the intergranular corrosion, the number of samples according to GOST 6032* from each heat corrosion-resistant layer in the party.
______________
* On the territory of the Russian Federation GOST 6032−2003, here and hereafter. — Note the manufacturer’s database.

4.6. The strength of the connection layers of two-layer sheets are checked by the test slice with the determination of the resistance of the slice of the plane of contact of the primary and corrosion-resistant layers.

Form sample, design, and test method of two-layer sheets given in the Appendix.

4.7. The thickness of the cladding layer is checked on two samples with a width of 30 mm taken from cross investigated template sheet. Length of samples shall be not less than 30 mm. One sample selected from mid-transverse the investigated template, and the second edge. One side of the sample is polished. The thickness of the corrosion-resistant layer is measured using a magnifier or a microscope with a scale division of 0.1 mm. For the thickness of the corrosion-resistant layer, take the minimum value of the results of the three measurements.

4.8. Macrostructure control on the longitudinal or longitudinal fractures treated templeto with GOST 10243. Method macro and place the cuttings sample is determined by the manufacturer.

4.9. Bending test, two-layer sheets is carried out according to GOST 14019*. The thickness of the mandrel should be equal to two, and for steel grade 10KH2M1 three thicknesses of the sample.
_______________
* On the territory of the Russian Federation GOST 14019−2003. — Note the manufacturer’s database.

For plates thicker than 30 mm specimens for bending test was adjusted to the required thickness by machining:

— one sample from the cladding layer to determine the plasticity of the base layer;

— two specimens from both sides to a depth proportional to the thickness of each layer to determine the adhesive strength of the layers;

— one sample from the base layer to define the ductility of the cladding layer.

4.10. Ductility is determined by bending the samples of the test layer outside. The strength of the connection layers is determined by bending the sample of the cladding layer inside and outside.

4.11. The tensile test is carried out according to GOST 1497 on samples with a corrosion-resistant layer or without it. At the customer’s request tensile test is performed only on the samples with the remote cladding layer.

Sheets with a thickness up to 15 mm test on flat specimens with a thickness of 16−25 mm — for flat or cylindrical, over 25 mm — cylindrical.

4.12. Test the impact strength of the main layer at normal and low temperatures carried out on samples of type 1−3 pre-remote corrosion-resistant layer according to GOST 9454, and after mechanical aging — according to GOST 7268. The test results take the arithmetic average values of three samples.

4.13. The production of samples, their preparation for testing, testing and evaluation of the propensity to intergranular corrosion cladding layer of steel of all grades and grade 06HN28MDT is carried out according to GOST 6032, and alloys of KHN65MV, KHN65MVU, N70MFV-VI — GOST 24982.

4.14. Through-fracture tests to determine the percentage of fiber and bending wide samples is carried out according to GOST 5521.

4.15. Continuity of adhesion of the layers is checked by ultrasonic inspection according to GOST 22727. Control methods sets the manufacturer. Continuity of adhesion layers two-layer steel with a thickness of 4 to 7 mm and steel, made without control by ultrasonic method check visually.

(Changed edition, Rev. N 1).

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Marking, packaging, transportation and storage of the sheets — GOST 7566 with the following additions:

from the side of the base layer is applied marks both layers (or conditional marking);

— indicate the number of melt of the main layer and the sheet number.

5.2. The sheets are transported in open vehicles.

(Changed edition, Rev. N 1).

APP (mandatory). TEST METHOD TWO-LAYER SHEETS CUT CORROSION-RESISTANT LAYER

APP
Mandatory

The test specimens in the cut aims to quantitatively establish the strength of the bond cladding and core layers.

Form of samples for testing shall be as defined on the devil.1

1 — core layer; 2 — corrosion-resistant layer; — thickness plot of the shear corrosion-resistant layer;  — the width of the section cut corrosion-resistant layer is equal to 1.5 .

Damn.1

Allowed to use different schemes of tests and samples of other forms while maintaining the width of the specimen and size .

Samples are taken equal to the thickness of the sheet taking into account the value of the processing by the base layer.

For sheets with thickness over 50 mm, mechanically treated sample from the main layer to increase its thickness to 50 mm.

When making samples you want to save the parallelism of processed surface to the samples under test were free to move without jamming in the guide parallel and at a pressure from above the cut sites occurred simultaneously along the entire cross section.

Initially made rectangular samples, and then to identify the boundaries between core and cladding layer, they are subjected to heating at 150−200 °C for 2−3 min, or smeared one side with a weak solution of any acid. In both cases, the samples revealed the boundary between core and cladding layer, which gives the opportunity to cut the pad plating layer. The excess cladding layer may be removed by planing or milling. It is necessary to ensure that the preparation of the entire cladding layer was removed, removing the core layer is allowed to a depth of 0.2 mm.

Samples experience according to the scheme given on features.2.

1 — guide; 2 — test sample;  — the attached load

Damn.2

The guides, which carry out tests on the press, made of hardened die steel grades 5KHNV, 3Х2В8 etc. the Guides shall be parallel, and in the lower part of the milled groove, so they do not have got jammed by the samples. The inner surface of the guide needs to be polished — they have to allow a hard setting for samples of different thicknesses. The lower part of the guides must be thoroughly sanded and verified — they need to be set straight on the press.

Testing is necessary to ensure that between the samples and the walls of the guides don’t appear to be too high friction, leading to distortion of test results.

To do this, before the test, check to see if the samples are clamped in the guides. Samples should pass freely in the guides, but this has not led to imbalance. Wall rails can be lightly oiled inside.

APP. (Changed edition, Rev. N 1).



The electronic text of the document
prepared by JSC «Code» and checked by:
the official publication of the
High quality steel: Sat. Standards. -
M.: IPK Publishing house of standards, 2002