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GB/T 702-2017: Hot-rolled steel bars - Dimensions, shape, weight and tolerances 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 702: Historical versions
GB/T 702-2017: Hot-rolled steel bars - Dimensions, shape, weight and tolerances---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/GBT702-2017GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.60 H 44 Replacing GB/T 702-2008 Hot-rolled steel bars - Dimensions, shape, weight and tolerances Issued on. SEPTEMBER 29, 2017 Implemented on. JUNE 01, 2018 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 Cross-sectional shape... 5 3 Cross-sectional dimensions, weight and tolerances... 6 4 Length and tolerances... 9 5 Shape... 11 Annex A (normative) Dimensions and theoretical weight of hot-rolled steel bars ... 15ForewordThis Standard is drafted in accordance with the rules given GB/T 1.1-2009. This Standard replaces GB/T 702-2008 “Hot-rolled steel bars - Dimensions, shape, weight and tolerances”, and compared with GB/T 702-2008, the main changes are as follows. - ADJUST the range of hot-rolled round steel bars and square steels; - ADJUST the tolerances on dimensions of hot-rolled round steels and square steels; - DELETE the provision on the full length of hot-rolled steel bars of general quality; - ADJUST the provision on the misshaped cutting at both ends of hot-rolled round steels and square steels; - ADD the provision on the fillet radius of hot-rolled flat steels; - ADJUST the provision on the curvature of hot-rolled hexagonal steels and hot- rolled octagonal steels; - ADJUST the provision on the misshaped cutting of hot-rolled hexagonal steels and hot-rolled octagonal steels; - DELETE the example of marking. This Standard is proposed by China Iron and Steel 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. Beiman Special Steel Co., Ltd. of Dongbei Special Steel Group, China Metallurgical Information and Standardization Institute, Jiangyin Xingcheng Special Steel Co., Ltd., Shougang Group, Fushun Special Steel Shares Co., Ltd. Main drafters of this Standard. Qian Chengyun, Wang Yujie, Chen Qinghua, Xiong Huabing, Gu Qiang, Liu Baoshi, Zhang Jinfeng. The historical editions of the standard replaced by this Standard are as follows. - GB/T 702-1965, GB/T 702-1972, GB/T 702-1986, GB/T 702-2004, GB/T 702-2008; - GB/T 704-1983, GB/T 704-1989; - GB/T 705-1983, GB/T 705-1990; - GB/T 911-1966, GB/T 911-2004. Hot-rolled steel bars - Dimensions, shape, weight and tolerances1 ScopeThis Standard specifies the cross-sectional shape, cross-sectional dimensions, weight and tolerances, length and tolerances, appearance, etc. of hot-rolled steel bars (round steels, square steels, flat steels, hexagonal steels, octagonal steels). This Standard applies to hot-rolled round steels with the diameter of 5.5 mm ~ 380 mm and hot-rolled square steels with the side length of 5.5 mm ~ 300 mm; hot-rolled flat steels for general purposes with the thickness of 3 mm ~ 60 mm and the width of 10 mm ~ 200 mm; hot-rolled tool flat steels with the thickness of 4 mm ~ 100 mm and the width of 10 mm ~ 310 mm (hot-rolled flat steels and hot-rolled tool flat steels for general purposes are generally referred to as hot-rolled flat steels); hot-rolled hexagonal steels with the distance across flats of 8 mm ~ 70 mm and hot-rolled octagonal steels with the distance across flats of 16 mm ~ 40 mm.2 Cross-sectional shape2.1 The cross-sectional shape of hot-rolled round steels and square steels is shown in Figure 1. 2.2 The cross-sectional shape of hot-rolled flat steels is shown in Figure 2. 2.3 The cross-sectional shape of hot-rolled hexagonal steels and hot-rolled octagonal steels is shown in Figure 3.3 Cross-sectional dimensions, weight and tolerances3.1 Dimensions and weight 3.1.1 The dimensions and theoretical weight of hot-rolled round steels and square steels shall comply with the provisions of Table A.1 in Annex A. 3.1.2 The dimensions and theoretical weight of hot-rolled flat steels for general purposes shall comply with the provisions of Table A.2. 3.1.3 The dimensions and theoretical weight of hot-rolled tool flat steels shall comply with the provisions of Table A.3. 3.1.4 The dimensions and theoretical weight of hot-rolled hexagonal steels and hot- rolled octagonal steels shall comply with the provisions of Table A.4. 3.1.6 Hot-rolled steel bars are generally delivered in actual weight. Negotiated by both supply and demand parties and indicated in the contract, hot-rolled steel bars may also be delivered in theoretical weight. 3.2 Dimensions and tolerances 3.2.1 The tolerances on dimensions of hot-rolled round steels and square steels shall comply with the provisions of Table 1.The group of tolerances on dimensions shall be indicated in the corresponding product standards or order contract; if not indicated, the tolerances of Group 3 shall prevail.4 Length and tolerances4.2 The tolerances on the full length and short length, cut length or multiple length of hot-rolled flat steels for general purposes shall comply with the provisions of Table 6. 4.3 The full length and short length of hot-rolled tool flat steels shall comply with the provisions of Table 7. 4.4 The full length and short length of hot-rolled hexagonal steels and hot-rolled octagonal steels shall comply with the provisions of Table 8.The tolerance on cut 4.5 Negotiated by both supply and demand parties, and indicated in the contract, the length of steel bars may be implemented according to the special requirements other than those specified Table 5, Table 6, Table 7 and Table 8. 4.6 The delivery volume of steel bars of short length shall not exceed 10 % of the total weight of this batch of steel bars.5 Shape5.1 Hot-rolled round steels and square steels 5.1.1 Hot-rolled round steels and square steels are delivered in straight form. 5.1.2 The out-of-roundness of round steels and the diagonal length of square steels shall comply with the provisions of Table 9. 5.1.3 For the out-of-squareness of square steels, the difference between any two side lengths in the same cross section shall not be greater than 50 % of the tolerance on nominal side length, and the difference between the two diagonal lengths shall not be greater than 70 % of the tolerance on nominal side length. 5.1.5 Hot-rolled square steels shall not be significantly reversed. 5.1.6 The misshaped cutting at both ends of hot-rolled round steels and square steels shall not be greater than 15 % of the nominal diameter of round steels or the nominal side length of square steels. Hot-rolled round steel and square steel ends cut with a shear allow partial deformation. 5.2 Hot-rolled flat steels 5.2.1 For hot-rolled tool flat steels, the curvature per meter shall not exceed 5 mm, the total curvature shall not be greater than 0.50 % of the total length, the lateral curvature (camber) per meter shall not exceed 5 mm, and the total lateral curvature shall not be less than 0.50 % of the total length. The curvature of hot-rolled flat steels for general purposes shall comply with the provisions of Table 11. 5.2.4 The irregularity of cross-sectional shape of hot-rolled flat steels is as shown in Figure 4 (a), Figure 4 (b), Figure 4 (c) and Figure 4 (d) below. The maximum allowable dimension C value shall comply with the provisions of Table 12. 5.2.5 The fillet radius r of hot-rolled flat steels is not taken as delivery inspection basis. 5.3 Hot-rolled hexagonal steels and hot-rolled octagonal steels 5.3.1 For hot-rolled hexagonal steels and hot-rolled octagonal steels, the difference in distances between any two opposite side lengths in the same cross-section shall not exceed 70 % of the tolerance. 5.3.3 The curvature of hot-rolled hexagonal steels and hot-rolled octagonal steels shall comply with the provisions of Table 14.The group of curvature shall be indicated in the corresponding product standard or order contract, if not indicated, Group 2 shall prevail. 5.3.4 Hot-rolled hexagonal and hot-rolled octagonal ends shall be cut to be straight. The misshaped cutting length shall not be greater than 15 % of the distance to across flats of the steel. Ends are cut with a shearing machine, and it allows partial deformation at ends. 5.3.5 Hot-rolled hexagonal steels and hot-rolled octagonal steels shall not be significantly reversed.Annex A(normative) Dimensions and theoretical weight of hot-rolled steel bars The dimensions and theoretical weight of hot-rolled steel bars are shown in Table A.1 ~ Table A.4. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 702-2017 be delivered?Answer: The full copy PDF of English version of GB/T 702-2017 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 702-2017_English with my colleagues?Answer: Yes. 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