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GB/T 4237-2015Hot rolled stainless steel plate, sheet and strip (English PDF)

不锈钢热轧钢板和钢带

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Issued by

AQSIQ; SAC

Level / Type

National · Recommended

Issue date

September 11, 2015

Implementation date

June 1, 2016

Scope

GB/T 4237-2015 is the English-translated version of 不锈钢热轧钢板和钢带.

China's national standard for hot rolled stainless steel plate, sheet and strip. It specifies the classification and codes, the order content, the dimensions, shape, weight and tolerances, the technical requirements, the test methods, the inspection rules and the packaging, marking and quality certificate. It is the companion to the cold rolled standard and covers the heavier end of flat stainless product - the plate from which tanks, pressure vessels, structural sections and heavy fabrications are made, and the hot rolled coil that is the feedstock for cold rolling. The distinction from cold rolled product is not only thickness. Hot rolled material has a scaled surface that must be pickled, a coarser grain, wider tolerances and no bright finish, and it is bought for what it does rather than for how it looks. Its grade list, its composition limits and its mechanical requirements are shared with the cold rolled standard, which is what allows a designer to specify a grade once.

Document preview — GB/T 4237-2015

National Standard of the People's Republic of China

ICS: 77.140.50
Classification: H46

Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

1 Scope
2 Normative references
3 Classification and code
4 Order content
5 Dimension, shape, weight and allowable deviation
5.1 Dimension and allowable deviation
5.1.2 Allowable deviation of thickness
5.1.3 Allowable deviation of width
5.2 Shape
5.2.4 Unevenness
5.2.6 Weight
6 Technical requirements
6.2 Chemical composition
6.3 Delivery state
6.4 Mechanical properties
6.5 Corrosion resistance
6.7 Surface processing and quality requirements
7 Test methods
7.3 Dimension and shape measurement
7.3.1 Dimension measurement
7.3.2 Shape measurement
8 Inspection rules
9 Packing, marking and quality certificate

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;

h) delivery state;

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.

5.1.3 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

6.4.2 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, alpha 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.

7.3.1 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

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 61 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223.3 · GB/T 223.5 · GB/T 223.9 · GB/T 223.11 · GB/T 223.16 · GB/T 223.19

Cited by

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