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GB/T 4171-2008: Atmospheric corrosion resisting structural steel 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 4171: Historical versions
GB/T 4171-2008: Atmospheric corrosion resisting structural steel---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/GBT4171-2008GB NATIONAL STANDARD ICS 77.140.50 H 46 Replacing GB/T 4171, GB/T 4172-2000, GB/T 18982-2003 Atmospheric corrosion resisting structural steel Issued on. OCTOBER 10, 2008 Implemented on. MAY 01, 2009 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the PRC. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 8 4 Classification and code... 8 5 Order content... 9 6 Dimension, shape, mass and allowable deviation... 9 7 Technical requirements... 10 8 Test methods... 14 9 Inspection rules... 15 10 Packaging, marking and quality certificates... 15 Appendix A (Informative) Comparison of new, old and similar designations.. 16 Appendix B (Informative) Comparison of designations in this standard and foreign similar designations... 17 Appendix C (Informative) Additional information to improve the atmospheric corrosion resistance steel... 18 Appendix D (Informative) Guidelines for assessing atmospheric corrosion resistance of low-alloy steels... 19ForewordThis standard refers to EN 10025-5.2004 “Hot rolled products of structural steels - Part 5.Technical delivery conditions for structural steels with improved atmospheric corrosion resistance” ISO 4952.2006 “Structural steels with improved atmospheric corrosion resistance”, ISO 5952.2005 “Continuously hot- rolled steel sheet of structural quality with improved atmospheric corrosion resistance”, ASTM A242/A242M-04 “Standard specification for high-strength low-alloy steel”, ASTM A588/A588M-05 “Standard specification for high- strength low-alloy structural steel, up to 50 ksi [345 MPa] minimum yield point, with atmospheric corrosion resistance”, ASTM A606-04 “Standard specification for steel, sheet and strip, high-strength low-alloy, hot-rolled and cold-rolled, with improved atmospheric corrosion resistance”, ASTM A871/A871M-03 “Standard specification for high-strength low-alloy structural steel plate with atmospheric corrosion resistance”, JIS G 3114.2004 “Hot-rolled atmospheric corrosion resisting steels for welded structure”, JIS G 3125.2004 “Superior atmospheric corrosion resisting rolled steel”, combines the development and application conditions of domestic atmospheric resistance steel, AND integrate and revise GB/T 4171-2000 “Superior atmospheric corrosion resisting structural steel”, GB/T 4172-2000 “Atmospheric corrosion resisting steel for welded structure”, and GB/T 18982-2003 “Corrosion resistant steel plates and strips for container". This standard replaces GB/T 4171-2000 “Superior atmospheric corrosion resisting structural steel”, GB/T 4172-2000 “Atmospheric corrosion resisting steel for welded structure”, and GB/T 18982-2003 “Corrosion resistant steel plates and strips for container". As compared with the above three standards, in this standard, the following main technical contents are modified. - RE-DEVELOP the standard name; - RE-DEVELOP the steel designation; - RE-ESTABLISH the chemical composition and mechanical properties of each designation; - ADD an appendix to assess the relative level of atmospheric corrosion resistance. Appendix A, B, C and D of this standard are informative appendixes. This standard was proposed by the China Iron and Steel Association. This standard shall be under the jurisdiction of the National Steel Standardization Technical Committee. The main drafting organizations of this standard. Anshan Iron and Steel Co., Ltd., Metallurgical Industry Information Standards Research Institute, Guangzhou Zhujiang Iron and Steel Co., Ltd., Shougang Corporation, Anyang Iron and Steel Group Co., Ltd. The main drafters of this standard. Guan Jichun, Pu Zhimin, Wang Xiaohu, Li Liejun, Li Kexin, Wei Xian. This Standard replaces the standard previously issued as follows. - GB/T 4171-84, GB/T 4171-2000; - GB/T 4172-84, GB/T 4172-2000; - GB/T 18982-2003. Atmospheric corrosion resisting structural steel1 ScopeThis standard specifies the dimension, shape, mass and allowable deviations, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of atmospheric corrosion resisting structural steels. This standard applies to hot-rolled and cold-rolled steel plates, strips and sections with atmospheric corrosion properties for vehicles, bridges, containers, buildings, towers and other structures. The atmospheric corrosion resisting structural steels can also be used to produce the structural parts for bolted, riveted and welded connection.2 Normative referencesThe provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document 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 diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method GB/T 223.9 Iron steel and alloy - Determination of aluminum content - Chrom azurol S photometric method GB/T 223.11 Iron steel and alloy - Determination of chromium content - Visible titration or potentiometric titration method GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N- Benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content3 Terms and definitionsThe following terms and definitions are used in this standard. 3.1 Atmospheric corrosion resisting steel It refers to the steel to which a small amount of alloying elements such as Cu, P, Cr, Ni, etc., are added to form a protective layer on the metal substrate surface to improve atmospheric corrosion resistance properties.4 Classification and code4.1 Classification As for the classification and application of each designation, SEE Table 1.5 Order contentDuring ordering, the user purchaser shall provide the following information.6 Dimension, shape, mass and allowable deviation6.1 Dimensions As for the product supply dimension range of different designations, SEE Table 2.Through negotiation between the supplier and the purchaser, it can supply the products of other specifications than those in Table 2. Table 2 in millimeters 6.2 Allowable deviations of dimensions 6.2.1 The dimensions, shapes, mass and allowable deviations of the hot-rolled steel plate and strip shall comply with the provisions of GB/T 709.7 Technical requirements7.1 Steel designation and chemical composition 7.1.1 The designation and chemical composition of the steel (melting analysis) shall be as specified in Table 3. 7.2 Smelting method The steel is subjected to converter or electric furnace smelting, AND in the form of killed steel. Unless the purchaser has special requirements, the smelting method shall be chosen by the supplier. 7.3 Supply Status Hot-rolled steel is supplied under hot-rolled, controlled rolling or normalized state; the steel of designation Q460NH, Q500NH and Q550NH can be supplied under quenched and annealed state; AND the cold-rolled steel is generally supplied under annealed state. 7.4 Mechanical properties and process performance 7.5 Other requirements As required by the purchaser through negotiation between the supplier and the purchaser AND indicated in the contract, it may add the following inspection items. 7.6 Surface quality 7.6.1 The surface of steel shall have no defects such as cracks, scarring, folds, pinhole, inclusions and delamination which may affect use. If there are such defects, it is allowed to clear them, BUT the clearing depth shall not exceed half of the steel thickness tolerance. The clearing part shall be smooth and free from edges or corners. It is not allowed to transversely remove the surface defects from the steel profiles.8 Test methods8.1 The appearance of steel shall be visually inspected. 8.2 The dimensions and shape of the steel shall be measured by appropriate measurement tools. 8.3 The inspection items, sample quantities, sampling methods and test methods for each batch of steel shall comply with the requirements in Table 7.9 Inspection rules9.1 Batching rules Steel shall be subjected to acceptance in batches. Each batch is composed of steel of same designation, same heat, same specification, same rolling system, and same supply state; AND the mass of each batch of cold-rolled product shall not exceed 30 t. 9.2 Re-inspection 9.3 Rounding off of values Unless otherwise specified in the contract or order, when it is needed to assess whether the test results meet the specified value, the rounding off method shall follow the provisions of YB/T 081.10 Packaging, marking and quality certificatesThe packaging, marking and quality certificate of steel shall comply with GB/T 247 or GB/T 2101.Appendix A(Informative) Comparison of new, old and similar designations As for the comparison of the designations in this standard and the old and similar designations, SEE Table A.1. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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