GB/T 4237-2015 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 4237-2015 | English | 145 |
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Hot rolled stainless steel plate, sheet and strip
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| GB/T 4237-2007 | English | 170 |
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Hot rolled stainless steel plate, sheet and strip
| Obsolete |
| GB/T 4237-1992 | English | 599 |
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Hot rolled stainless steel sheets and plates
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GB/T 4237-2015: Hot rolled stainless steel plate, sheet and strip---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4237-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 4237-2007
Hot rolled stainless steel plate, sheet and strip
Issued on. SEPTEMBER 11, 2015
Implemented on. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Classification and code... 8
4 Order content... 8
5 Dimension, shape, weight and allowable deviation... 9
6 Technical requirements... 15
7 Test methods... 33
8 Inspection rules... 36
9 Packing, marking and quality certificate... 37
Annex A (informative) Comparing table of stainless steel grades in different countries
... 38
Annex B (informative) Characteristics and uses of stainless steels... 43
Annex C (informative) Heat treatment system of stainless steels... 57
1 Scope
This Standard specifies the classification, code, order content, dimension, shape,
weight and allowable deviation, technical requirements, test methods, inspection rules,
packaging, marking and product quality certificates of hot rolled stainless steel plates,
sheets and strips.
This Standard applies to corrosion-resistant hot-rolled thick stainless steel plates
(hereinafter referred to as thick steel plates), corrosion-resistant hot-rolled wide
stainless steel strips (hereinafter referred to as wide steel strips) and their roll-cutting
specified-length steel plates (hereinafter referred to as roll-cutting steel plates) and
slitting wide steel strips, also applies to corrosion-resistant hot-rolled narrow stainless
steel strips (hereinafter referred to as narrow steel strips) and their roll-cutting
specified-length steel strips (hereinafter referred to as roll-cutting steel strips).
2 Normative references
The following documents are indispensable for the application of this document. For
dated references, only the dated edition applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The
diantipyrylmethane phosphomolybdate gravimetric method for the determination of
phosphorus content
GB/T 223.4 Alloyed steel - Determination of manganese content - Potentiometric or
visual titration method
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon
content - Reduced molybdosilicate spectrophotometric method
GB/T 223.8 Methods for chemical analysis of iron, steel and alloy - The sodium
fluoride separation-EDTA titration method for the determination of aluminium
content
GB/T 223.9 Iron steel and alloy - Determination of aluminium content - Chrom azurol
S photometric method
GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visual
titration or potentiometric titration method
GB/T 223.16 Methods for chemical analysis of iron, steel and alloy - The
chromotropic acid photometric method for the determination of titanium content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium
thiosulfate separation iodimetric method for the determination of copper content
GB/T 223.19 Methods for chemical analysis of iron steel and alloy - The
neocuproine-chloroform extraction photometric method for the determination of
copper content
3 Classification and code
3.1 Classification by edge state is as follows.
a) edge-trimming, EC;
b) non-edge-trimming, EM.
3.2 Classification by dimension and shape precision grade is as follows.
a) thickness general precision, PT.A;
b) thickness higher precision, PT.B;
c) unevenness general grade, PF.A;
d) unevenness higher grade, PF.B.
4 Order content
The contract or order according to this Standard shall include the following contents.
a) standard number;
b) product name;
c) steel grade or unified digital code;
d) dimension and precision;
e) weight (quantity) of the delivery;
f) surface processing type;
g) edge state;
h) delivery state;
5 Dimension, shape, weight and allowable deviation
5.1 Dimension and allowable deviation
5.1.1 Dimension range of steel plates, sheets and strips
The nominal dimension range of steel plates, sheets and strips are shown in Table 1.
The recommended nominal dimension shall comply with the specifications in 5.2 of
GB/T 709-2006.According to the requirements of the demand party, and after the
consultation of both supply and demand parties, products of other dimensions may
adopt this table.
5.1.2 Allowable deviation of thickness
5.1.3 Allowable deviation of width
5.1.3.1 The allowable deviation of edge-trimming thick steel plates’ width shall comply
with the specifications in Table 7, and the allowable deviation of non-edge-trimming
thick steel plates’ width shall be determined through consultation between supply and
demand parties.
5.2 Shape
5.2.1 The camber of thick steel plates, wide steel strips and roll-cutting steel plates
shall comply with the specifications in Table 11.
5.2.2 The camber of narrow steel strips and roll-cutting steel strips shall comply with
the specifications in Table 12.
5.2.3 The tangential inclination of thick steel plates, roll-cutting steel plates and roll-
cutting steel strips shall not be more than 1% of the nominal width.
5.2.4 Unevenness
5.2.4.1 The unevenness of thick steel plates shall comply with the specifications in
Table 13.
5.2.5 Shape
The steel coil shall be firmly rolled and kept as cylindrical as possible without curling.
The trunnion of edge-trimming (slitting) steel coils shall not be more than 35 mm, and
the trunnion of the non-edge-trimming steel coils shall not be more than 70 mm.
5.2.6 Weight
5.2.6.1 Steel plates are delivered in theoretical or actual weight. The steel density shall
comply with the specifications in Annex A of GB/T 20878-2007 when calculating the
weight. If not specified, it shall be determined through consultation between supply and
demand parties.
5.2.6.2 Steel strips shall be delivered in actual weight.
6 Technical requirements
6.1 Smelting methods
Steel shall adopt the primary smelting of molten steel and furnace refining process.
6.2 Chemical composition
6.2.1 The classification, grade and chemical composition (melting analysis) of steels
shall comply with the specifications in Tables 15 to 19.See Annex A for stainless steel
grades in different countries. See Annex B for characteristics and uses of stainless steels.
6.2.2 The allowable deviation of the chemical composition of steel plates, sheets and
strips shall comply with the specifications of GB/T 222.
6.3 Delivery state
6.3.1 After hot rolling, steel plates, sheets and strips can be delivered after heat
treatment and pickling or similar treatment. If the demand party agrees, the treatment
such as pickling can be omitted. See Annex C for heat treatment.
6.3.2 For the heat treatment of precipitation-hardening steels, the demand party shall
indicate in the contract the type of heat treatment of the steel plate or specimen, steel
strip or specimen, and if not indicated, it shall be delivered in solid solution.
6.4 Mechanical properties
6.4.1 The mechanical properties of heat treated steel plates, sheets and strips shall
comply with the specifications of 6.4.3 to 6.4.8.
6.4.2 For the hardness test, choose one of the test methods according to different
dimensions and states of steel plates, sheets and strips. When carrying out bending
tests to annealed ferritic and martensitic steel plates, sheets and strips, there shall be
no visible cracks on the outer surface.
6.4.3 The mechanical properties of austenitic steel plates, sheets and strips after sold
solution treatment shall comply with the specifications in Table 20.
6.5 Corrosion resistance
6.5.1 The steel plates, sheets and strips shall be carried out intergranular corrosion
resistance test according to 6.5.3 to 6.5.6.The test method shall be determined
through consultation between supply and demand parties and indicated in the contract.
If not indicated in the contract, the test may not be carried out. For low-carbon stainless
steels with molybdenum content of not less than 3%, the sensitization treatment before
the test shall be determined through consultation between supply and demand parties.
6.5.2 For steel grades not listed in Table 27 to Table 30, intergranular corrosion
resistance test shall be carried out; the test method and requirements shall be
determined through consultation between supply and demand parties and indicated in
the contract.
6.5.3 The determination of eroded tissues after 10% oxalic acid etching test shall
comply with the specifications in Table 27.
6.6 Grain size
According to the requirements of the demand party, through the consultation between
supply and demand parties, and indicated in the contract, the stainless steel with the
steel grade of 07Cr19Ni10, 07Cr17Ni12Mo2, 07Cr19Ni11Ti and 07Cr18Ni11Nb shall
be carried out grain size inspection, the average grain size shall be grade 7 or more
coarse.
6.7 Surface processing and quality requirements
6.7.1 Type of surface processing for steel plates, sheets and strips
The type of surface treatment for steel plates, sheets and strips is shown in Table 31.
The demand party shall specify the type of surface processing in accordance with the
use requirements. The type of surface processing other than Table 31 may be provided
through the consultation of supply and demand parties and indicating in the contract.
6.8 Special requirements
According to the requirements of the demand party, there may be special requirements
for steels’ chemical composition, mechanical properties, α phase content in austenite
- ferrite and non-metallic inclusions, etc., or supplement specifications of non-
destructive test, etc.; the specific content shall be determined through the consultation
of supply and demand parties.
7 Test methods
7.1 Test methods for chemical composition
The test method for steels’ chemical composition shall comply with the specifications
in GB/T 223.3, GB/T 223.4, GB/T 223.5, GB/T 223.8, GB/T 223.9, GB/T 223.11, GB/T
223.16, GB/T 223.18, GB/T 223.19, GB/T 223.23, GB/T 223.25, GB/T 223.26, GB/T
223.28, GB/T 223.33, GB/T 223.36, GB/T 223.40, GB/T 223.53, GB/T 223.58, GB/T
223.60, GB/T 223.61, GB/T 223.68, GB/T 223.69, GB/T 11170, GB/T 20123 and GB/T
20124.
7.2 Inspection items, sampling methods and positions, number of samples and
test methods of steel plates, sheets and strips
The inspection items, sampling methods and positions, number of samples and test
methods of each batch of steel plates, sheets or strips shall meet the specifications in
Table 32.
7.3 Dimension and shape measurement
7.3.1 Dimension measurement
7.3.1.1 Thickness measurement
7.3.1.1.1 Thick steel plates. measure at any position at a distance not less than 40 mm
from the edge of steel plates.
7.3.1.1.2 Wide steel strips, roll-cutting steel plates. at non-edge-trimming state
measure at any position at a distance not less than 40 mm from the rolling edge of
steel strips; at edge-trimming (slitting) state, measure at any position at a distance not
less than 20 mm from the trimming edge of steel strips.
7.3.1.2 Width measurement
Width measurement position. perpendicular to the rolling direction. Except for
abnormal parts on the head and tail of non-edge-trimming steel strips.
7.3.2 Shape measurement
7.3.2.1 Camber. see Figure 1 for measurement method; except for abnormal parts on
the head and tail of non-edge-trimmed steel strips.
8 Inspection rules
8.1 Inspection of steel plates, sheets and strips shall be carried out by the quality
inspection department of supply parties.
8.2 The mechanical properties of steel plates, sheets and strips used as raw materials
of cold rolling shall be inspected only when the demand party requires and indicates
in the contract.
8.3 steel plates, sheets and strips shall be accepted in batches. Each batch shall
consist of steel plates, sheets and strips of the same grade, the same furnace number,
the same thickness and the same heat treatment system.
9 Packing, marking and quality certificate
The packaging, marking and quality certificates of steel plates, sheets and strips shall
comply with the specifications of GB/T 247.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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