GOST 11268-76
GOST 11268−76 rolled sheet special purpose alloyed structural high-grade steel. Specifications (with Amendments No. 1, 2, 3)
GOST 11268−76
Group
INTERSTATE STANDARD
THIN-SHEET SPECIAL PURPOSE ALLOYED STRUCTURAL HIGH-GRADE STEEL
Specifications
Alloyed structural high-grade rolled steel sheets for special purposes. Specifications
OKP 09 9100
Date of introduction 1978−01−01
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 11268−65
Change No. 3 adopted by the Interstate Council for standardization, Metrology and certification (Protocol No. 8, dated 12.10.95)
The adoption voted:
| The name of the state | The name of the national standardization body |
| The Republic Of Belarus | Belstandart |
| The Republic Of Kazakhstan | Gosstandart Of The Republic Of Kazakhstan |
| The Republic Of Moldova | Moldovastandart |
| Russian Federation | Gosstandart Of Russia |
| The Republic Of Tajikistan | Tajik state center for standardization, Metrology and certification |
| Turkmenistan |
Turkmengeologiya |
| Ukraine |
Gosstandart Of Ukraine |
4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced | Item number |
| GOST 8.001−80 | 4.2 |
| GOST 8.326−89 | 4.2 |
| GOST 162−90 | 4.2 |
| GOST 166−89 | 4.2 |
| GOST 427−75 | 4.2 |
| GOST 1497−84 | 4.7 |
| GOST 1763−68 | 4.5, 4.9 |
| GOST 2216−84 | 4.2 |
| GOST 3749−77 | 4.2 |
| GOST 4543−71 | 2.1 |
| GOST 5639−82 | 4.11 |
| GOST 5640−68 | 4.10 |
| GOST 5378−88 | 4.2 |
| GOST 6507−90 | 4.2 |
| GOST 7502−98 | 4.2 |
| GOST 7564−97 | 4.6 |
| GOST 7565−81 | 3.3, 4.1 |
| GOST 7566−94 | 3.1, 3.5, 5.1, 5.1.3 |
| GOST 10510−80 | 4.8 |
| GOST 11701−84 | 4.7 |
| 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 12365−84 | 4.1 |
| GOST 14192−96 | 5.1.4 |
| GOST 15846−79 | 5.1.5 |
| GOST 18895−97 | 4.1 |
| GOST 19903−74 | 1.1, 1.2, 2.3, 4.2 |
| GOST 19904−90 | 1.1, 1.2, 2.3, 4.2 |
| GOST 24597−81 | 5.1.3 |
| GOST 26663−85 | 5.1.3 |
| GOST 26877−91 | 4.2 |
| GOST 28473−90 | 4.1 |
5. Limitation of actions taken by Protocol No. 4−93 of the Interstate Council for standardization, Metrology and certification (ICS 4−94)
6. EDITION with Amendments No. 1, 2, 3, approved in October 1982, June 1987-may 1996 (ICS 1−83, 11−87, 8−96)
This standard applies to hot-rolled and cold-rolled flat products of stainless steel, special purpose, manufactured in sheets up to 3.9 mm and used in the heat-treated condition.
(Changed edition, Rev. N 2, 3).
1. ASSORTMENT
1.1. Shape, dimensions, limit deviations and other requirements for grades must meet the requirements:
— GOST 19903 — for hot rolled sheets of high and normal rolling accuracy;
— GOST 19904 — for cold-rolled sheets of high and normal rolling accuracy.
1.2. Deviation from flatness shall not exceed the standards high flatness (DF) according to GOST 19903 for hot rolled sheets and high standards of flatness (PV), and at the request of the consumer standards very high flatness (FOR) according to GOST 19904 for cold rolled sheets.
Examples of symbols
Rental cold-rolled sheet, thickness 0.9 mm, width 600 mm, length 1200 mm, high precision manufacturing: thickness (AT) and width (ASH), particularly high flatness (FOR) according to GOST 19904, of steel grade 12KH2NVFA, category 4:
The hot rolled sheet, thickness 2.2 mm, width 650 mm, length 2000 mm, normal accuracy of rolling B, high flatness (DF) according to GOST 19903, of steel grade 19KH2NMFA, category 1:
Examples of symbols that are allowed to lead in the design documentation
Rental cold-rolled sheet, thickness 0.9 mm, width 600 mm, length 1200 mm, high precision manufacturing: thickness (AT) and width (ASH), particularly high flatness (FOR) according to GOST 19904, of steel grade 12KH2NVFA, category 4:
(Changed edition, Rev. N 2, 3).
2. TECHNICAL REQUIREMENTS
2.1. Sheets are produced in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.
(Added, Rev. N 1).
2.1. Brand and chemical composition of steel shall be as specified in table.1.
Table 1
| Steel grade | Mass fraction of elements, % | |||||||||
| Carbon | Silicon | Mar Ganz |
Chrome | Nickel | Molyb- den |
WOL- FRAM |
Vanadium | Sulfur | Phosphorus | |
| no more | ||||||||||
| 25KHGSA, 30KHGSA, 30KHGSN2A, (30ХГСНА) |
According to GOST 4543 | |||||||||
| 12KH2NMFA |
0,09−0,16 | 0,17−0,37 | 0,30−0,70 | 1,9−2,4 | 0,8−1,2 | 0,35−0,45 | - | 0,18−0,28 | 0,025 | 0,025 |
| 12KH2NVFA | - | 1,0−1,4 | ||||||||
| 12KH2NM1FA | 0,60−0,90 | 1,2−1,6 | 0,70−1,00 | - | ||||||
| 12KH2NVFMA | 0,35−0,45 | 1,0−1,4 | ||||||||
| 19KH2NMFA | 0,16−0,23 | 0,30−0,70 | 0,8−1,2 | - | ||||||
| 19KH2NVFA | - | 1,0−1,4 | ||||||||
| 21KH2NMFA | 0,19−0,23 | 0,35−0,45 | - | |||||||
| 21KH2NVFA | - | 1,0−1,4 | ||||||||
| 23KH2NMFA | 0,19−0,26 | 0,35−0,45 | - | |||||||
| 23KH2NVFA | - | 1,0−1,4 | ||||||||
Notes:
1. Mass fraction of residual copper in the steel of all grades should not exceed 0.25%, and at the request of the consumer to 0.20%.
2. By agreement between manufacturer and consumer, the sheets of steel grades listed in table.1, manufactured with narrowed limits of the mass fractions of individual elements.
3. Allowed Wolfram to 0.20%, molybdenum up to 0.15%, titanium up to 0.03% vanadium and up to 0.05% in steels, alloyed with these elements, unless a different number is not due to a special agreement.
4. In steel grades 12KH2NMFA, 19KH2NMFA, 21KH2NMFA, 23KH2NMFA and 12KH2NM1FA allowed the partial replacement of molybdenum with tungsten on the basis that one mass part of the molybdenum is replaced by three mass parts of tungsten. In this case the mass fraction of tungsten should not exceed 0.3%.
In steel grades 12KH2NVFA, 19KH2NVFA, 21KH2NVFA and 23KH2NVFA permitted to replace the residual tungsten molybdenum on the basis that one mass fraction of molybdenum replaces three of the mass fraction of tungsten. In this case the mass fraction of tungsten in steel each brand should be not less than 0.60%.
5. Ready to hire a deviation in chemical composition:
| — silicon, vanadium, molybdenum | ±0,02% |
| — chromium, tungsten | ±0,05% |
| — manganese (when the content is less than 1.0%) | ±0,02% |
| — manganese (at a content of 1.0% or more) | ±0,05% |
| — Nickel | -0,05% |
(Changed edition, Rev. N 2, 3).
2.2. Sheets are produced in the annealed (softened) state. Allowed to produce leaves in the normalized condition.
2.3. The leaves should be cropped from all sides. Sheets laminated on the continuous rolling mills can be supplied with mill longitudinal edge.
Quality edging edging must comply with the requirements:
— GOST 19903 — for hot rolled sheets;
— GOST 19904 — for cold rolled sheets.
When the supply of sheets mill edge tears and other defects (if they are on the edges) must not exceed half of the limit deviations on width and output sheets for a nominal size width specified in the order.
(Changed edition, Rev. N 3).
2.4. Macrostructure of steel shall not have traces of shrinkage, delamination, foreign inclusions, cracks, blisters and shall be ensured by the fabrication technology.
2.5. Depending on the normalized parameters and mechanical properties of sheets made according to the categories given in table.2.
Table 2
| Normalized indicator | Category | |||
| 1 | 2 | 3 | 4 | |
| Mechanical properties of the sheets in the softened or normalized condition |
+ | - | + | + |
| Mechanical properties of the sheets are determined on thermally treated samples (quenching+tempering) |
- | + | ||
| The depth of the extruded holes (for sheets with thickness up to 1.0 mm) |
- | - | ||
Note. The «+" sign means that the indicator is normalized, the sign «— «is not normalized.
2.6. Mechanical properties of the sheets in the softened or normalized condition shall be as specified in table.3.
Table 3
| Steel grade | Tensile strength |
Elongation, %, not less than | |
| 25KHGSA |
490−690 (50−70) | 21 | 17 |
| 30KHGSA |
490−740 (50−75) | 20 | 16 |
| 30KHGSN2A (30ХГСНА) |
590−830 (60−85) | 19 | 15 |
| 12KH2NMFA |
490−740 (50−75) | 15 | 11 |
| 12KH2NVFA |
|||
| 12KH2NM1FA |
|||
| 12KH2NVFMA |
|||
| 19KH2NMFA |
18 | 16 | |
| 19KH2NVFA |
|||
| 21KH2NMFA |
15 | 11 | |
| 21KH2NVFA |
|||
| 23KH2NMFA |
490−780 (50−80) | 17 | 15 |
| 23KH2NVFA |
|||
Notes:
1. For sheets with thickness up to 0.9 mm incl. the value of elongation not normalized.
2. For sheets supplied in the normalized condition, may be increased to a strength of 49 N/mm(5 kgf/mm
) in the observance of the relative elongation.
3. (Deleted, Rev. N 1).
Mechanical properties of the sheets are determined on heat-treated samples shall be as specified in table.4.
Table 4
| Steel grade | Heat treatment | Tensile strength |
Elongation | |||
| Hardening | Leave (recommended) |
|||||
| Tempe temperature, °C |
Environment cooling | Tempe temperature, °C |
Environment cooling | not less than | ||
| 25KHGSA | 880 | Oil | 470−550 | Water or oil |
1080 (110) | 10 |
| 30KHGSA | 480−570 | Oil | ||||
| 30KHGSN2A | 900 | 200−300 | The air | 1570 (160) | 9 | |
| (30ХГСНА) | 1570 (160)* | 9* | ||||
| 12KH2NMFA | 910 | 490−550 | 1030 (105) | 10 | ||
| 12KH2NVFA | ||||||
| 12KH2NM1FA | Air or oil | 500−550 | 980 (100) | 11 | ||
| 12KH2NVFMA | ||||||
| 19KH2NMFA | 925 | Oil | 450−550 | 1130 (115) | 9 | |
| 19KH2NVFA | ||||||
| 21KH2NMFA | 550−570 | |||||
| 21KH2NVFA | ||||||
| 23KH2NMFA | 890 | 590−620 | Air or oil | |||
| 23KH2NVFA | ||||||
________________
* For highest quality.
Notes:
1. During heat treatment of the samples according to the modes specified in table.4, a deviation of quenching temperature ±15 °C.
2. (Deleted, Rev. N 2).
2.7. The surface of the sheets must be clean, smooth, flat, without bubbles rolled out, smoothed out the cracks, smoothed out the dirt and pollution, stress crack, sinks-vdaviv, shells from scale, wooloowin, katanoi scale, rolling and kletochnykh captured. Bundle sheets is not allowed.
Some local surface defects of the sheets should be removed with a gentle sweep of a fine-grained emery or felt circle. Stripping should take the sheets beyond the minimum thickness.
Welding and sealing of surface defects is not permitted.
2.6, 2.7 (Revised edition, Edit. 1, 2, 3).
2.8. On the surface of cold rolled sheets permitted: on the front side of the plate — light scratches, fingerprints, rolled fingerprints, the local nabesna a depth of not more than half of the thickness tolerance of the sheet, as well as the color of a tint; on the back — these defects and Rabina, not outputting the sheet beyond the minimum thickness.
On the surface of hot-rolled steel sheets on both sides is allowed for fingerprints, light scratches and local nabesna, not outputting the sheets beyond the minimum thickness and color of a tint and a touch of sludge.
At customer’s request, cold-rolled sheets must be manufactured with a polished surface of one side of the sheet.
On the polished surface defects are not allowed.
Note. Allowed the requirements to the surface quality set by standards agreed upon between manufacturer and user.
(Changed edition, Rev. N 3).
2.9. The leaves are category 4, with a thickness of 1 mm or less, designed for cold stamping shall be tested by squeezing. The squeezing depth of the hole should correspond specified in the table.5.
Table 5
Dimensions are in millimeters
| Steel grade | The squeezing depth of the hole when the thickness of the sheet, at least | |||||
| 0,5 | 0,6 | 0,7 | 0,8 | 0,9 | 1,0 | |
| 25KHGSA, 12KH2NVFA, 12KH2NMFA | 7,0 | 7,4 | 7,6 | 7,8 |
8,0 | 8,2 |
| 30KHGSA, 30KHGSN2A, (30ХГСНА), 12KH2NVFMA, 12KH2NM1FA, 19KH2NVFA, 19KH2NMFA, 21KH2NVFA, 21KH2NMFA, 23KH2NVFA, 23KH2NMFA |
7,2 | 7,5 | 7,7 | |||
Notes:
1. For sheets of intermediate thickness standards the depth of the extruded hole to take the nearest lower thickness specified in table.5.
2. (Deleted, Rev. N 1).
(Changed edition, Rev. N 1).
2.10. Depth bezoperatsionnogo layer (for pure ferrite) for sheets from steel grades 25KHGSA, 30KHGSA and 30KHGSN2A (30ХГСНА) must not exceed 2.5% on each side of the actual sheet thickness.
2.11. At the customer’s request sheets are produced:
a) from the steel grades listed in table.1, with narrowed limits for the mass fraction of carbon;
b) steel grades 12KH2NVFA and 12KH2NMFA with a mass fraction of carbon 0,11−0,16%;
C) control of poloschatosti microstructure;
g) the control of the austenitic grain size;
d) with the value bezoperatsionnogo layer less than 2.5% of the thickness of the sheet.
Note. Methods and standards in subparagraphs C and d is established by agreement between the consumer and the manufacturer.
(Changed edition, Rev. N 3).
3. ACCEPTANCE RULES
3.1. The leaves take parties. The party must consist of sheets of one melting ladle, one thickness and one mode of heat treatment, drawn up by one document on quality.
3.1. Each batch is accompanied by a quality document with GOST 7566.
(Added, Rev. N 1; amended, Rev. N 3).
3.2. Dimensions, surface quality and condition of the edges of the check in the stream or in the acceptance of all sheets of the party.
3.3. To check the chemical composition of the sample size — according to GOST 7565.
3.4. To check mechanical properties of poloschatosti microstructure, decarburization and testing at the extrusion of the selected two leaves from different places of the party.
3.5. If unsatisfactory test results of at least one of the indicators, repeat tests performed on the sample selected according to GOST 7566.
4. TEST METHODS
4.1. Sampling for the determination of chemical composition produced according to GOST 7565. Chemical composition of steel is determined according to GOST 12344*-GOST 12356, 12365 GOST, GOST GOST 18895и 28473 or other methods providing the required accuracy.
______________
* On the territory of the Russian Federation GOST 12344−2003, here and hereafter. — Note the manufacturer’s database.
If there are differences in the chemical composition of steel is determined according to GOST 12344-GOST 12356, 12365 GOST, GOST and GOST 18895 28473.
4.2. The geometric dimensions and shape of the rental is determined by means of measuring instruments according to the GOST 162, 166 GOST, GOST 2216, GOST 427, GOST 3749, 5378 GOST, GOST 6507, GOST 7502, GOST 26877, and tools or templates, certified according to GOST 8.001* or GOST 8.326*.
________________
* On the territory of the Russian Federation are PR 50.2.009−94**.
** PR 50.2.009−94 abrogated on the basis of the order of the Ministry of industry and trade
(Changed edition, Rev. N 3).
4.3. The surface quality of the sheets checked by visual examination.
4.4. Stratification is controlled by visual inspection of the edges of the sheet from the manufacturer and when the cut sheets from the consumer.
4.5. For testing from each test sheet selected:
— for mechanical testing of sheets in the softened or normalized condition (see table.3) two transverse sample;
mechanical testing heat-treated samples (see table.4) two of the longitudinal sample;
— to control the depth bezoperatsionnogo layer — two samples according to GOST 1763;
— to determine the microstructure poloschatosti two longitudinal sample;
— to test the extrusion of the two transverse sample. Samples for test by squeezing taken away in the middle and from the edge of the control sheet;
— for the determination of grain size — one sample from melting.
4.6. Sampling for mechanical tests according to GOST 7564.
(Changed edition, Rev. N 1).
4.7. Tensile testing of sheets with a thickness of 3.0 mm and more is carried out according to GOST 1497 on samples with an initial estimated length 
During the checking, the consumer is allowed to conduct tests on samples with an initial estimated length 
Tensile test of sheets up to 3.0 mm is carried out according to GOST 11701 on samples with an initial estimated length 
20 mm.
(Changed edition, Rev. N 3).
4.8. Test by squeezing is carried out according to GOST 10510.
4.9. Bezoperatsionnogo the depth of the layer is controlled according to GOST 1763, method M
4.10. Banding of the microstructure is determined according to GOST 5640.
4.11. The austenitic grain size is determined according to GOST 5639.
5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE
5.1. Marking, packaging, transportation and storage in accordance with GOST 7566 with the following additions.
(Changed edition, Rev. N 2).
5.1.1. Put the sheets coated on both sides with neutral oil.
5.1.2. At the customer’s request sheets provided with the marking of each sheet has a dye.
5.1.3. Rental is transported by all kinds of transport in accordance with cargo carriage regulations applicable to transport of this species.
When transporting in a single address two or more parcels, the dimensions of which allow it to form a transport package with dimensions according to GOST 24597 and when carload shipments of freight must be formed into transport packets churchyard 26663.
The packaging produce strapping tape or wire in accordance with GOST 7566.
Weight package — up to 10 tons, height of the package is 500 mm.
The cargo securing in accordance with the technical conditions of loading and fastening of goods* approved by MPs.
________________
* Probably, the error of the original. Should read: «Technical conditions of loading and fastening cargoes». — Note the manufacturer’s database.
(Changed edition, Rev. N 2, 3).
5.1.4. Transport marking of packages perform in accordance with trebovaniyami 14192 indicating the core, additional information and signatures to be performed on the goods or labels securely attached to the load.
5.1.5. The packing of rental with transportation to the far North and remote areas is carried out in accordance with GOST 15846*.
_______________
* On the territory of the Russian Federation GOST 15846−2002. — Note the manufacturer’s database.
5.1.6 Weight of cargo must not exceed when mechanized loading into open vehicles is 10 tons, covered — 1250 kg.
5.1.3−5.1.6 (Introduced later, Rev. N 2).
5.2. Steel of vacuum-arc remelting, denoted by VD index of a dash at the end of the name of the steel grade.
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
