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GB/T 708-2019: Dimension, shape, weight and tolerance for cold-rolled steel strip and sheet Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 708: Historical versions
Similar standardsGB/T 708-2019: Dimension, shape, weight and tolerance for cold-rolled steel strip and sheet---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/GBT708-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 H 46 Replacing GB/T 708-2006 Dimension, shape, weight and tolerance for cold-rolled steel strip and sheet Issued on. MARCH 25, 2019 Implemented on. FEBRUARY 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Classification and code... 6 5 Dimensions... 7 6 Dimension tolerances... 8 7 Shape... 12 8 Measurement of dimensions and shape... 14 9 Weight... 16 10 Rounding off of numerical values... 17ForewordThis Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 708-2006 “Dimension, shape, weight and tolerance for cold-rolled steel plates and sheets”. Compared with GB/T 708-2006, the main technical changes of this Standard are as follows. - MODIFY the thickness and width ranges of steel sheets and strips (see 5.1 of this Standard, 5.1 of 2006 edition); - MODIFY the thickness tolerance of steel sheets and strips, which is specified respectively according to the specified minimum yield strength Re < 260 MPa, 260 MPa ≤ Re < 340 MPa, 340 MPa ≤ Re ≤ 420 MPa, Re > 420 MPa (see Table 2, Table 3, Table 4, Table 5 of this Standard, Table 2 of 2006 edition); - ADD the higher precision (PW.B) of width tolerance of slit wide strips and its requirements; MODIFY the width tolerance of slit wide strips (see 6.2.3 of this Standard, 6.2.2 of 2006 edition); - MODIFY the flatness of steel sheets and strips according to the specified minimum yield strength Re < 280 MPa, 280 MPa ≤ Re < 360 MPa, Re < 260 MPa, 260 MPa ≤ Re < 340 MPa; MODIFY the requirements for flatness (see 7.1 of this Standard, 7.1 of 2006 edition); - ADD the requirement that steel sheets and strips are supplied according to general precision when the thickness tolerance, width tolerance, length tolerance and flatness are default (see 6.1.6, 6.2.2, 6.3, 7.1.1); - ADD the negotiation terms when the yield strength and requirements are not specified in the thickness tolerance and flatness requirements of steel sheets and strips in the product standard (see 6.1.5, 7.1.5); - MODIFY the requirements for camber (see 7.2 of this Standard, 7.2 of 2006 edition); - MODIFY the “cutting angle” to “out-of-squareness”; ADD the method and requirements for the measurement of out-of-squareness using the diagonal method (see 7.3 of this Standard, 7.3 of 2006 edition); - ADD the requirements for the measurement position of flatness of steel strips (see 8.3.3); - ADD the schematic diagram of the measurement of out-of-squareness using the diagonal method [see 8.5b)]. 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/TC 183). Drafting organizations of this Standard. China Metallurgical Information and Standardization Institute, Tangshan Branch of Hebei Iron and Steel Co., Ltd., Guangxi Liuzhou Iron and Steel Group Co., Ltd., Shougang Group Co., Ltd., Anshan Iron and Steel Co., Ltd., Baoshan Iron and Steel Co., Ltd. Main drafters of this Standard. Hou Jie, Zhang Weixu, Li Qian, Deng Cuiqing, Gan Guiping, Tang Mu, Su Haolu, Hu Ling, Xu Feng, Tan Cuiying. The previous released versions replaced by this Standard are as follows. - GB 708-1965, GB 708-1988, GB/T 708-2006. Dimension, shape, weight and tolerance for cold-rolled steel strip and sheet1 ScopeThis Standard specifies terms and definitions, classification and code, dimensions, dimension tolerances, shape requirements, measurement of dimensions and shape, weight and rounding off of numerical values of cold- rolled steel sheets and strips. This Standard applies to cold-rolled wide strips, slit wide strips and sheets cut from strip of which the rolling width is not less than 600 mm (hereinafter referred to as steel sheets and strips). Steel plates may also refer to this Standard.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 8170 Rules of rounding off for numerical values & expression and judgement of limiting values3 Terms and definitionsFor the purpose of this document, the following terms and definitions apply. 3.1 wide strip Steel strips with a width of not less than 600 mm and delivered in rolls. 3.2 slit wide strip Slit from wide strips and delivered in rolls. 3.3 sheet cut from strip Cut form steel strips and delivered in sheets.4 Classification and code4.1 Classification according to edge state is as follows. 4.2 Classification according to dimension precision and code is as follows. 4.3 Classification according to flatness precision and code is as follows. 4.4 Classification of dimensions and precision of flatness corresponding to product shape and edge state is shown in Table 1.5 Dimensions5.1 Dimension range 5.1.1 The nominal thickness of steel sheets and strips is not more than 4.00 mm. 5.1.2 The nominal width of steel sheets and strips is not more than 2150 mm. 5.2 Recommended nominal dimensions 5.2.1 The nominal thickness of steel sheets and strips shall be within the range specified in 5.1. 5.2.2 The recommended nominal width of steel sheets and strips is any dimension in multiples of 10 mm. 5.2.3 The nominal length of steel sheets is within the range specified in 5.1.The recommended nominal length is any dimension in multiples of 50 mm.6 Dimension tolerances6.1 Thickness tolerance 6.1.1 The thickness tolerance of steel sheets and strips of which the minimum yield strength Re is less than 260 MPa shall comply with the requirements of Table 2. 6.1.5 When the yield strength is not specified in the product standard and the thickness tolerance is not specified, the thickness tolerance of steel sheets and strips shall be agreed upon between the supply and demand parties and indicated in the contract. 6.2 Width tolerance 6.2.1 The width tolerance of cut-edge steel sheets and wide strips shall comply with the requirements of Table 6.The width tolerance of mill-edge steel sheets and wide strips shall be agreed upon between the supply and demand parties. 6.3 Length tolerance The length tolerance of steel sheets shall comply with the requirements of Table 8.If the demand party requires supply according to the higher precision of length (PL.B), it shall be indicated in the contract. If not indicated, supply according to the general precision of length (PL.A).7 Shape7.1 Flatness 7.1.1 The flatness of steel sheets shall comply with the requirements of Table 9.If the demand party requires supply according to the higher precision of flatness (PF.B), it shall be indicated in the contract. If not indicated, supply according to the general precision of flatness (PF.A). 7.1.4 When the user has requirements for the flatness of steel strips, after the user has fully flattened the steel strips, the values specified in Table 9 are also applicable to steel sheets cut by the user from the steel strips. 7.1.5 When the yield strength is not specified in the product standard and the flatness is not specified, the flatness of steel sheets and strips shall be agreed upon between the supply and demand parties and shall be indicated in the contract. 7.2 Camber The camber of steel sheets and strips shall not exceed 5 mm in any length of 2000 mm. When the length of the steel sheet is not more than 2000 mm, the camber shall not exceed 0.25 % of the actual length of the steel sheet. The camber of slit wide strips shall not exceed 2 mm in any length of 2000 mm. 7.3 Out-of-squareness Steel sheets shall be cut at a right angle. When measured using the projection method, the out-of-squareness shall not be greater than 1 % of the actual width of the steel sheet. 7.4 Tower shape Steel strips shall be firmly wound into a roll. The height of the tower shape on one side of the steel strip roll shall comply with the requirements of Table 10.8 Measurement of dimensions and shape8.1 Thickness 8.1.1 For mill-edge steel sheets and strips, it is measured at a distance of not less than 40 mm from the rolling side. For cut-edge steel sheets and strips, it is measured at a distance of not less than 25 mm from the cutting side. 8.2 Width The width shall be measured at where perpendicular to the centerline of steel sheets and strips. 8.3 Flatness 8.3.1 Place the steel sheet freely on a platform. Except for the weight of the steel sheet itself, do not apply any pressure. Measure the maximum distance between the lower surface of the steel sheet and the platform, as shown in Figure 1. 8.3.2 If limited by the length of the test platform, for steel sheets with a length greater than 2000 mm, it may arbitrarily take 2000 mm for the measurement of flatness instead of measuring the flatness of full length. 8.4 Camber The camber of steel sheets and strips refers to the maximum distance between the side and the straight line connecting the two ends of the measuring portion. It is measured on the concave side of the product, as shown in Figure 2.9 Weight9.1 Steel sheets are delivered according to theoretical or actual weight. Steel strips are delivered according to actual weight. 9.2 When steel sheets are delivered according to theoretical weight, the theoretical weight is calculated using nominal dimensions and the carbon steel density of 7.85 kg/dm3.Other steel grades are weighted according to the corresponding standards. 9.3 The theoretical weight of steel sheets is calculated according to the calculation method specified in Table 11.10 Rounding off of numerical valuesThe measurement results are rounded off according to the rounded off value comparison method. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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