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GB/T 3280-2015: Cold 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/GBT3280-2015GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 H 46 Replacing GB/T 3280-2007 Cold rolled stainless steel plate, sheet and strip Issued on. SEPTEMBER 11, 2015 Implemented on. JUNE 01, 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 ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Classification, code... 8 4 Order content... 9 5 Dimension, shape, weight and tolerances... 9 6 Technical requirements... 19 7 Test methods... 44 8 Inspection rules... 46 9 Packaging, marking and quality certificate... 47 Annex A (informative) Comparison table of stainless steel designations of various countries... 48 Annex B (informative) Characteristics and uses of stainless steel... 54 Annex C (informative) Heat treatment system for stainless steel... 65ForewordThis Standard was drafted according to the rules given in GB/T 1.1-2009. This Standard replaces GB/T 3280-2007 “Cold rolled stainless steel plate, sheet and strip”. Compared with GB/T 3280-2007, the main technical changes are as follows. - ADD “3/4 cold hardened state” in the classification; - ADD “edge state” in the order contents; - ADJUST the dimensional accuracy of steel plates, sheets and strips; - MODIFY the unevenness of roll-cut steel strips II; - ADD 23 steel designations and related technical requirements; - ADJUST the chemical composition of 5 steel designations; - ADJUST the mechanical properties of 13 steel designations, and SUPPLEMENT some HV hardness; - MODIFY the original steel designation 022Cr18NbTi to 022Cr18Nb; - MODIFY the specimens for elongation at break of steel plates, sheets and strips with a thickness of not more than 3 mm to A50 mm; - ADD 2E surface processing type; - MODIFY reinspection and determination rules; - ADD specifications for rounding off of the test results of mechanical properties and chemical composition; - ADD Annex A “Comparison table of stainless steel designations of various countries” (informative). This Standard was proposed by China Iron and Steel Industry Association. This Standard is under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/C 183). Main drafting organizations of this Standard. Shanxi Taigang Stainless Steel Co., Ltd., Baosteel Stainless Steel Co., Ltd., China Metallurgical Information and Standardization Institute, Sichuan Southwest Stainless Steel Co., Ltd., Ningbo Baoxin Stainless Steel Co., Ltd., Shandong Taishan Steel Group Co., Ltd. Main drafters of this Standard. Wu Qiang, Zhang Jingjing, Xu Zhongjie, Dong Li, Wang Jun, Yan Zhuxian, Chen Peidun, Sun Mingshan, Wang Xiaohu, Ji Dengping, Li Liuyi, Wang Chuandong, Yan Yan, Zhang Weixu. The previous editions of the standards replaced by this Standard are. - GB 3280-1984, GB/T 3280-1992, GB/T 3280-2007; - GB 4239-1984, GB/T 4239-1991. Cold rolled stainless steel plate, sheet and strip1 ScopeThis Standard specifies the classification, code, order contents, dimension, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of cold rolled stainless steel plates, sheets and strips. This Standard applies to corrosion-resistant cold rolled stainless steel wide steel strip (hereinafter referred to as wide steel strip) and its roll-cut cut-to-size steel plate/sheet (hereinafter referred to as roll-cut steel plate/sheet), slitting cold rolled wide steel strip (hereinafter referred to as slitting wide steel strip) and its roll-cut cut-to-size steel strip (hereinafter referred to as roll-cut steel strip I), cold rolled narrow steel strip (hereinafter referred to as narrow steel strip) and its roll-cut cut-to-size steel strip (hereinafter referred to as roll-cut steel strip II), as well as single-sheet steel plate/sheet.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. 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 diantipyryl methane 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 content3 Classification, code3.1 Classification according to hardening state is as follows. 3.2 Classification according to edge state is as follows. 3.3 Classification according to dimension and shape accuracy is as follows.4 Order contentContracts or orders placed under this Standard shall include the following. a) standard number; b) product name; c) steel designation or unified digital code; d) dimension and precision; e) weight (amount) of delivery; f) surface processing type; g) edge state; h) delivery state;5 Dimension, shape, weight and tolerances5.1 Dimension and tolerances 5.1.1 Dimension range of steel plates, sheets and strips The nominal dimension range of steel plates, sheets and strips is shown in 5.1.2 Thickness tolerances 5.1.3 Width tolerances 5.1.3.1 The width tolerances for cut-edge (EC) wide steel strips and roll-cut steel plates (sheets), slitting wide steel strips and roll-cut steel strips I shall comply with the specifications of general precision (PT.A) in Table 4.If required by the demand party and specified in the contract, higher precision (PT.B) in Table 4 may be implemented. 5.1.3.2 The width tolerances for mill-edge (EM) wide steel strips and roll-cut steel plates (sheets) shall comply with the specifications of Table 5. 5.1.3.3 The width tolerances for cut-edge (EC) narrow steel strips and roll-cut 5.1.4 Length tolerances 5.1.4.1 The length tolerances for roll-cut steel plates (sheets) and roll-cut steel strips I shall comply with the specifications of general precision (PT.A) in Table 7.If required by the demand party and specified in the contract, higher precision (PT.B) in Table 7 may be implemented. 5.1.4.2 The length tolerances for roll-cut steel strips II shall comply with the specifications of general precision (PT.A) in Table 8.If required by the demand party and specified in the contract, higher precision (PT.B) in Table 8 may be implemented. 5.2 Shape 5.2.1 Unevenness 5.2.1.1 The unevenness of roll-cut steel plates (sheets) and roll-cut steel strips I shall comply with the specifications of general precision (PT.A) in Table 9.If required by the demand party and specified in the contract, higher precision (PT.B) in Table 9 may be implemented. 5.2.2 Camber 5.2.2.1 The camber of wide steel strips and roll-cut steel plates (sheets), slitting wide steel strips and roll-cut steel strips I shall comply with the specifications of Table 12.The camber of cold-hardened roll-cut steel plates (sheets) is agreed upon between the supply and demand parties. 5.2.2.2 The camber of narrow steel strips and roll-cut steel strips II shall comply with the specifications of general precision (PT.A) in Table 13. 5.2.3 Out-of-out-of-squareness 5.2.4 Edge wave The edge wave of wide steel strips, slitting wide steel strips and narrow steel strips shall comply with the following specifications. edge wave = wave height h/wave length L 5.2.5 Shape of steel coils 5.2.5.1 The steel coils shall be firmly rolled and kept as cylindrically as possible and not crimped. The inner diameter of steel coils shall be specified in the contract. 5.3 Single-sheet-rolled steel plates (sheets) The dimension, shape and tolerances of single-sheet-rolled steel plates (sheets) may be implemented according to the specifications of GB/T 708-2006.If the demand party has special requirements, they shall be agreed upon between the supply and demand parties. 5.4 Weight Steel plates, sheets and strips are delivered according to actual or theoretical weights. When delivered according to theoretical weight, the density of steel shall be calculated according to Annex A of GB/T 20878-2007.If not specified, it shall be agreed upon between the supply and demand parties.6 Technical requirements6.1 Steel designation, classification and chemical composition 6.1.1 The designation, classification and chemical composition (smelting analysis) of steel shall comply with the requirements of Tables 16 to 20.See Annex A for the comparison of stainless steel designations of various countries. See Annex B for the characteristics and use of stainless steel. 6.1.2 The tolerances of chemical composition of finished products shall comply with the specifications of GB/T 222. 6.2 Smelting method Steel should adopt smelting molten steel plus furnace refining. 6.3 Delivery state 6.3.1 After cold rolling of steel plates, sheets and strips, they may be delivered after heat treatment and pickling or similar treatments. When performing a bright heat treatment, treatment such as acid washing may be omitted. The heat treatment system is shown in Annex C. 6.3.4 Straightening, leveling or grinding may be performed as necessary. 6.4 Mechanical properties 6.4.1 The mechanical properties of various types of steel plates, sheets and strips after heat treatment shall comply with the specifications of 6.4.4 to 6.4.10. 6.4.2 For several hardness tests, it may choose one of the tests according to the different dimensions and states of steel plates, sheets and strips. 6.4.3 The elongation after fracture and hardness values of steel plates, sheets and strips with a thickness of less than 0.3 mm are for reference only. 6.4.4 The mechanical properties of solution-treated austenitic steel plates, sheets and strips shall comply with the specifications of Table 21. 6.5 Corrosion resistance 6.5.1 Steel plates, sheets and strips are subjected to the intergranular corrosion resistance test according to Tables 33 to 36. 6.5.2 When the steel designations not listed in Tables 33 to 36 are subjected to the intergranular corrosion resistance test, the test method and requirements shall be agreed upon between the supply and demand parties and specified in the contract.7 Test methods7.1 Test methods for chemical composition The test methods for chemical composition of steel shall comply with the specifications of 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, GB/T 20124. 7.2 Inspection items, sampling methods and positions, sampling volume and test methods of steel plates, sheets and strips The inspection items, sampling methods and positions, sampling volume and test methods of each batch of steel plates, sheets and strips shall comply with the specifications of Table 38. 7.3 Measurement methods for dimension and shape 7.3.1 Measurement of dimension 7.3.1.1 Measurement of thickness 7.3.2 Measurement of shape 7.3.2.1 Unevenness. The steel plate is laid flat on the platform under its own weight, and the maximum distance between the lower surface of the steel plate and the platform in any direction is measured. 7.3.2.2 Camber. The measurement method is shown in Figure 1.It can be measured with a 1 m ruler. Narrow steel strips are measured at 3 turns away from the head and tail of the steel coil. 7.3.2.3 Out-of-squareness. The measurement method is shown in Figure 2. 7.3.2.4 Edge wave. The measurement method is shown in Figure 3.8 Inspection rules8.1 The inspection of steel plates, sheets and strips is performed by the supply party’s quality inspection department. 8.2 The mechanical properties of steel plates, sheets and strips used as raw materials for cold rolling shall be examined only when required by the demand party and specified in the contract. 8.3 Steel plates, sheets and strips shall be submitted for acceptance in batches. Each batch shall consist of steel plates, sheets and strips of the same steel designation, the same furnace number, the same thickness and the same heat treatment system. 8.5 The test results of mechanical properties and chemical composition shall be rounded off by using the rounding off value comparison method,9 Packaging, marking and quality certificateThe packaging, marking and quality certificate 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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