GB/T 908-2019 PDF EnglishUS$145.00 · In stock · Download in 9 seconds
GB/T 908-2019: Forged bars for 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 908: Historical versions
GB/T 908-2019: Forged bars for 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/GBT908-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.60 H 44 Replacing GB/T 908-2008 Forged bars for dimensions, shape, weight and tolerances Issued on. JUNE 04, 2019 Implemented on. MAY 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 Classification... 5 3 Section shape... 5 4 Section size, weight and allowable deviation... 6 Annex A (normative) Size and theoretical weight of forged bars... 13ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 908-2008 “Forged Bars - Dimensions, Shape, Weight and Tolerances”. Compared with GB/T 908-2008, main changes are as follows. - maximum nominal diameter of round steel was increased from 400mm to 1000mm; maximum nominal side length of square steel was increased from 400mm to 1000mm; correspondingly added stipulations on allowable size deviation (see Table 1 of this Edition, Table 1 of Edition 2008); - maximum nominal thickness of flat steel was increased from 160mm to 800mm; maximum nominal width was increased from 300mm to 1500mm; correspondingly added stipulations on allowable size deviation (see Table 2 of this Edition, Table 2 of Edition 2008); - added stipulations on size, shape and allowable deviation of polished round steel (see Table 1 of this Edition); - added stipulations on size, shape and allowable deviation of machined steel bar (see Table 3 of this Edition); - tightened stipulations on curvature of steel bar (see 4.4 of this Edition, 2.5 of Edition 2008); - added requirements for steel bar delivery with both ends sawing and stipulations on cutting slope (see Table 6 of this Edition); - deleted marking examples (see Clause 4 of Edition 2008). This Standard was proposed by China Iron and Steel Association. This Standard shall be under the jurisdiction of National Technical Committee on Steels of Standardization Administration of China (SAC/TC 183). The drafting organizations of this Standard. Northeast Special Steel Group Fushun Special Steel Co., Ltd., Xiwang Special Steel Company Limited, Metallurgical Industry Information Standards Institute. Main drafters of this Standard. Gu Qiang, Yu Zongyang, Wang Yujie, Zhang Qingsheng, Chen Qingxin, Liu Baoshi, Li Wenshuang. Versions of standard substituted by this Standard are. - GB/T 908-1972, GB/T 908-1987, GB/T 908-2008; - GB/T 16761-1997. Forged bars for dimensions, shape, weight and tolerances1 ScopeThis Standard specifies section shape, section size, weight and allowable deviation, length and allowable deviation, shape of forged bars (round steel, square steel, flat steel). This Standard is applicable to forged round steel of which diameter is 40mm~1000mm, forged square steel of which side length is 40mm~1000mm and flat steel of which thickness is 20mm~800mm, width is 40mm~1500mm.2 ClassificationForged bars, according to surface state of delivery, are classified into following three categories.3 Section shape3.1 Section shapes of forged round steel and flat steel are shown as Figure 1.4 Section size, weight and allowable deviation4.1 Size and weight 4.1.1 Sizes and theoretical weights of forged round steel, square steel shall comply with provisions of Table A.1 in Annex A. 4.1.3 Theoretical weights of forged bars that exceed nominal size range specified in Table A.1, Table A.2 are determined by supplier and purchaser via negotiation. 4.2 Allowable size deviation 4.2.1 Hot-forged bars 4.2.1.1 Sizes and allowable deviations of hot-forged wound steel and flat steel shall comply with Table 1.Allowable size deviation groups shall be indicated in corresponding product standards or order contracts. If not specified, perform according to allowable deviation of Group 2. 4.2.1.4 Agreed by supplier and purchaser and indicated in contract, hot-forged bars of medium size unlisted in Table 1 and Table 2 or hot-forged bars of maximum nominal size exceeding Table 1 and Table 2 can be also supplied. 4.2.2 Polished bars 4.2.2.1 Size and allowable deviation of polished round steel of which nominal diameter is 40mm~200mm shall comply with Table 1.Size and allowable deviation of polished round steel of which nominal diameter is greater than 200mm~600mm shall comply with Table 3.Allowable size deviation groups shall be indicated in corresponding product standards or order contracts. If not specified, perform according to allowable deviation of Group 2. 4.2.3 Machined bars Size and allowable deviation of machined bars shall comply with Table 4. 4.3 Length and allowable deviation 4.3.1 Generally, delivery length for forged bars shall not be less than 1500mm. 4.3.2 Short-foot forged bars of which length is not less than 1000mm are allowed to deliver. But their weights must not exceed 10% of total weight of this batch of delivery. 4.3.3 When delivered according to definite length, double length, its allowable length deviation is mm. 4.4 Shape 4.4.1 Hot-forged bars 4.4.1.1 Hot-forged round steel 4.4.1.3 Hot-forged flat steel 4.4.1.3.1 Plane curvature of hot-forged flat steel per meter shall not exceed 4mm. Total plane curvature shall not exceed 0.4% of total length. 4.4.1.3.2 Side curvature (sickle bend) per meter of hot-forged flat steel shall not exceed 4mm. Total side curvature (sickle bend) shall not exceed 0.4% of total length. 4.4.2 Polished bars 4.4.2.1 Curvature of polished round steel per meter shall not exceed 4mm. Total curvature shall not exceed 0.4% of total length. 4.4.2.2 Diameter difference of polished round steel at one same section shall not exceed 0.7 times nominal diameter tolerance. 4.4.3 Machined bars 4.4.3.1 Curvature of round steel and square steel per meter shall not exceed 2.5mm. Total curvature shall not exceed 0.25% of total length. 4.4.3.2 Plane curvature and side curvature (sickle bend) of flat steel shall not exceed 2.5mm per meter. Total curvature shall not exceed 0.25% of total length. 4.4.4 Cutting slope of end face 4.4.4.1 Both end faces of forged bars shall be delivered in sawing. 4.4.4.2 Cutting slope of end face of forged bars shall comply with Table 5.Annex A(normative) Size and theoretical weight of forged bars A.1 See Table A.1 for sizes and theoretical weights of round steel, square steel of which nominal diameter or side length is 40mm~400mm. A.2 See Table A.2 for size and theoretical weight of flat steel of which nominal thickness is 20mm~160mm, nominal width is 40mm~300mm. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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