GB/T 1220-2007 PDF EnglishUS$125.00 · In stock · Download in 9 seconds
GB/T 1220-2007: Stainless steel rod 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 1220: Historical versions
GB/T 1220-2007: Stainless steel rod---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/GBT1220-2007GB ICS 77.140.20 H 40 NATIONAL STANDARD Replacing GB/T 1220-1992 Stainless Steel Bars Issued on. MAY 14, 2007 Implemented on. DECEMBER 01, 2007 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... 6 2.Normative References... 6 3.Terms and definitions... 10 4.Contents in order sheet... 10 5.Classification... 10 6.Dimension, shape, weight and permissible deviation... 11 7.Technical requirements... 12 7.1 Grade and chemical components... 12 7.2 Melting method... 12 7.3 Delivery state... 12 7.4 Mechanical properties... 12 7.5 Corrosion resistance... 25 7.6 Macro structure... 26 7.7 Hot forging... 26 7.8 Surface quality... 26 7.9 Special requirements... 27 8.Test methods... 27 9.Inspection rules... 28 9.1 Inspection and acceptance... 28 9.2 Lot organization rules... 28 9.3 Sampling position and sampling quantity... 28 9.4 Rules for re-inspection and determination... 28 10.Packing, marking and quality certificate... 29 Annex A... 30 Annex B... 33 1.Scope This Standard specifies the dimensions, shape, technical requirements, test methods, inspection rules, packing marks, and certificate quality of stainless steel bars (generic terms of round steel, square steel, flat steel, hexagonal steel and octagonal steel, hereinafter refer to as “Steel bar”). This Standard is applicable to the hot rolled and forged steel bars of which the dimension (diameter, side length, thickness or subtense distance, hereinafter refer to as “Dimension”) is no more than 250mm. Through negotiations of both the Supplier and Buyer, it may also supply the hot rolled and forged steel bars of which the dimension is more than 250mm. 2.Normative References The articles contained in the following documents have become part of this Standard when they are quoted herein. For the dated documents so quoted, all the modifications (excluding corrections) or revisions made thereafter shall not be applicable to this Standard. For the undated documents so quoted, the latest editions shall be applicable to this Standard. GB/T 222 Permissible deviations 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 phosphonium content GB/T 223.4 Methods for chemical analysis of iron, steel and alloy - The volumetric method for determination of manganese content by ammonium nitrate oxidation GB/T 223.5 Methods for chemical analysis of iron, steel and alloy – The reduction type silicomolybdic acid spectrophotometric method for the determination of acid-soluble silicon content 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 3.Terms and definitions The technical terms and definitions established in GB/T 20878 and GB/T 15574 are applicable to this Standard. 4.Contents in order sheet The contract for goods or order form made according this Standard shall contain the following contents. 5.Classification 5.1 By structural features, steel bars are divided into 5 categories - austenite type, austenite-ferrite type, ferrite type, martensite type, and precipitation-hardening type. 5.2 By application methods, steel bars are divided into 2 categories as follows. 6.Dimension, shape, weight and permissible deviation 6.1 Dimension, shape, weight and permissible deviation of hot-rolled round steel and square steel The dimension, shape, weight and permissible deviation of hot-rolled round steel and square steel shall conform to the stipulations set forth in GB/T 702-2004, the concrete requirements of which shall be indicated in contract. Otherwise it shall execute the second group contained in GB/T 802-2004 Standard. 6.2 Dimension, shape, weight and permissible deviation of hot-rolled flat steel The dimension, shape, weight and permissible deviation of hot-rolled flat steel shall conform to the stipulations set forth in GB/T 704-1988, the concrete requirements of which shall be indicated in contract. Otherwise it shall execute the contract according to the common class as specified in GB/T 704-1998. 6.3 Dimension, shape, weight and permissible deviation of hot-rolled hexagonal steel and octagonal steel The dimension, shape, weight and permissible deviation of hot-rolled hexagonal steel and octagonal steel shall conform to the stipulations set forth in GB/T 705-1985, the concrete requirements of which shall be indicated in contract. Otherwise it shall execute the contract according to the second group as specified in GB/T 705-1985. 6.5 Dimension, shape, weight and permissible deviation of forged flat steel The dimension, shape, weight and permissible deviation of forged flat steel shall conform to the stipulations set forth in GB/T 16761-1997, the concrete requirements of which shall be indicated in contract. Otherwise it shall execute the contract according to the second group as specified in GB/T 16761-1997. 6.6 Weight Steel bars shall be delivered by actual weight. 7.Technical requirements 7.1 Grade and chemical components 7.2 Melting method Unless it is otherwise stipulated in contract, it shall usually adopt initial molten steel plus out-of-furnace refining process. 7.3 Delivery state Steel bars can be delivered in heat-treated or non-heat-treated state and the order can select delivery state with reference to Articles 7.3.1 ~ 7.3.4, which shall be indicated in contract. Otherwise, it shall deliver non-heat-treated steels. The regulations for heat treatment of all kinds of steel bars refer to Table A.1 ~ Table A.5 in Annex A. 7.4 Mechanical properties 7.4.1 The heat treatment regulations for all kinds of steel bars of test pieces shall refer to the stipulations set forth in Table A.1 ~ Table A.5 of Annex A. The dimension of test piece blank for heat treatment shall usually be 25mm. When the dimension of steel bar is less than 25mm, heat treatment shall be conducted on original dimension steel bars. 7.4.4 The mechanical properties of precipitation-hardening type steel bars shall be indicated in contract, otherwise it shall execute the second group in contract. 7.4.5 If the Supplier can guarantee the qualification of mechanical properties, it may wholly or partially omit mechanical property test. 7.6 Macro structure 7.7 Hot forging 7.7.1 Steel for hot heading upsetting (to be indicated in contract) shall be subject to hot forging test to forge test piece to one third of the original height without crack or breach on the surface. 7.7.2 This test can be omitted for steel bar with dimension to be more than 80mm if the Supplier can guarantee the qualification of forging test. 7.8 Surface quality 7.8.1 The surface of steel bars for pressing processing shall have no crack, scab, fold or inclusion on surface, otherwise, the defects mentioned above must be eliminated. 7.8.2 It is permissible for steel bars for cutting processing to have local defects no more than stipulations counting from nominal dimension as set forth in Table 15. 7.8.3 It can remove the scale produced by heat treatment by pickling, turning or other methods through negotiations of both the Supplier and Buyer, which shall be indicated in contract. 7.9 Special requirements Steel bars can be supplied by the following special requirements as requested by the Buyer and with agreement reached by both the Supplier and Buyer. 8.Test methods The inspection items and test methods for each lot of steel bars shall conform to the stipulations as set forth in Table 16. 9.Inspection rules 9.1 Inspection and acceptance The inspection and acceptance of steel bars shall be conducted by the technical and quality control departments of the Supplier. 9.2 Lot organization rules The inspection and acceptance of steel bars shall be carried out lot by lot. Each lot shall be composed of steel bars of the same grade, same furnace number, same processing method, same dimension and same delivery state (same furnace number of heat treatment). 9.3 Sampling position and sampling quantity The sampling position and sampling quantity for each lot of steel bars shall conform to the stipulations set forth in Table 16. 9.4 Rules for re-inspection and determination 10.Packing, marking and quality certificate The packing, marking and quality certificate shall conform to the stipulations of GB/T 2101. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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