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GB/T 11253-2019: Cold-rolled sheet and strip of carbon structural steels 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 11253: Historical versions
Similar standardsGB/T 11253-2019: Cold-rolled sheet and strip of carbon structural steels---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/GBT11253-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 H 46 Replacing GB/T 11253-2007, GB/T 716-1991 Cold-rolled sheet and strip of carbon structural steels Issued on. OCTOBER 17, 2019 Implemented on. SEPTEMBER 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 Classification and code... 7 4 Order content... 8 5 Size, shape, weight... 8 6 Technical Requirements... 9 7 Test method... 12 8 Inspection rules... 13 9 Packaging, marking and quality certificate... 13ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 11253-2007, Cold-rolled sheets and strips of carbon structural steels and GB/T 716-1991, Cold-rolled carbon structural steel strips. This Standard combines GB/T 11253-2007, Cold-rolled sheets and strips of carbon structural steels and GB/T 716-1991, Cold-rolled carbon structural steel strips. Compared with GB/T 11253-2007 and GB/T 716-1991, the major technical changes of this Standard are as follows. -- Modify the thickness range of steel plates and strips and the width range of cold-rolled narrow steel plates and strips (see Chapter 1, Chapter 1 of GB/T 11253-2007); -- Modify the surface structure classification and code (see 3.2, 3.2 of GB/T 11253-2007); -- Modify the order content, and add the surface structure type and oiling regulations (see Chapter 4, Chapter 4 of GB/T 11253-2007); -- Modify the size, shape, weight and tolerance of cold-rolled narrow steel plates and steel strips (see Table 1, Table 1 of GB/T 716-1991); -- Add designation-Q325 and corresponding chemical composition, mechanical property and process property (see Table 2, Table 3, Table 4); -- Modify the technical requirements for cold-rolled narrow steel plates and steel strips (see Table 3, Table 3 of GB/T 716-1991); -- Add surface structure requirements (see Table 6); -- Add requirements of rounding off of numerical values (see 8.4); -- Delete the quality certificate type regulations for steel plates and strips (see Chapter 9 of GB/T 11253-2007). This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee 183 on Iron and Steel of Standardization Administration of China (SAC/TC 183). The drafting organizations of this Standard. Angang Steel Company Limited, China Metallurgical Information and Standardization Institute, Shougang Group Co., Ltd., Hunan Valin Lianyuan Iron and Steel Co., Ltd., Guangxi Liuzhou Iron and Steel Group Company Limited. The drafters of this Standard. Su Haolu, Huang Qiuju, Li Qian, Hou Jie, Tang Mu, Tian Fei, Jiang Cailing, Qi Bing, Guan Jichun, Zhang Weixu, Wang Haiquan, Yang Yuebiao, Wang Yue, Xin Lifeng. The previous versions of the standards which are replaced by this Standard are. -- GB/T 11253-1989, GB/T 11253-2007; -- GB/T716-1983, GB/T716-1991. Cold-rolled sheet and strip of carbon structural steels1 ScopeThis Standard specifies the order content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of cold-rolled sheet and strip of carbon structural steels. This Standard applies to cold-rolled sheet and strip of carbon structural steels with a thickness of not more than 4 mm, including cold-rolled wide strip and shear steel strip, slit steel strip (referred to as wide steel plate and steel strip) with a width of not less than 600 mm AND cold-rolled narrow steel strip and shear steel plate (referred to as narrow steel plate and steel strip) with a width range of 250mm ~ < 600mm. A single cold-rolled steel sheet of which the width is not less than 600 mm can also refer to it to perform.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. 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 223.9, Iron, steel and alloy. Determination of aluminium content. Chrome azurol S photometric method GB/T 223.11, Iron, steel and alloy. Determination of chromium content. Visual titration or potentiometric titration method GB/T 223.18, Methods for chemical analysis of iron steel and alloy. The sodium thiosulfate separation iodimetric method for the determination of cupper content3 Classification and code3.1 Steel plates and strips are divided according to surface quality. 3.2 Steel plates and strips are divided according to their surface structure.4 Order content4.1 The contract or order in accordance with this Standard shall include the following information. 4.2 If the size and unevenness accuracy, surface quality level, surface structure type, edge state and packaging method are not indicated in the order contract, the standard products are supplied to pitted-surface oil-coated cutting-edge plats or strips according to ordinary grade and unevenness accuracy, higher level surface quality and surface structure, and packaged according to the packaging that is provided by the supplier.5 Size, shape, weight5.1 The size, shape, weight and allowable deviation of wide steel plates and steel strips shall comply with the provisions of GB/T 708. 5.2 The size, shape, weight and allowable deviation of narrow steel plates and steel strips shall comply with the provisions of GB/T 15391, of which, the allowable deviation of width shall comply with the requirements of Table 1.6 Technical Requirements6.1 Designation and chemical composition 6.1.1 The steel designation and chemical composition (melting analysis) shall comply with the requirements of Table 2. 6.1.2 When aluminum is used to deoxidize, the content of acid-soluble aluminum (Als) in the steel shall not be less than 0.015%, or the total aluminum (Alt) content shall not be less than 0.020%. 6.1.3 The residual elements, such as chromium, nickel and copper contents, in the steel, which can be guaranteed by the supplier, can be free from analysis. 6.1.4 The nitrogen content in the steel, which is guaranteed by the supplier, can be free from analysis. 6.1.5 Under the condition that the mechanical properties of steel comply with the requirements of this Standard, the carbon, manganese and silicon contents Designation 6.1.6 The allowable deviation of chemical composition of the finished steel product shall comply with the provisions of GB/T 222. 6.2 Smelting method Steels are smelted by oxygen converter or electric furnace. Unless the buyer has special requirements and it is specified in the contract, the smelting method is generally determined by the supplier. 6.3 Delivery status 6.4 Mechanical property 6.4.1 The horizontal tensile test of steel plates and strips that are delivered in a flat state after annealing shall comply with the requirements of Table 3.If the horizontal sample cannot be taken on the narrow steel plate and steel strip due to the width, the vertical sample is taken for tensile test; the mechanical property qualification value is determined by the supplier and the buyer. 6.5 Surface quality 6.5.1 The surface of steel plates and steel strips shall be free of defects such as air bubbles, cracks, crusting, folding and inclusions that are harmful to the use. Steel plates and strips shall not be visually layered. 6.6 Surface structure 6.6.1 The surface structure of the steel strips is divided into three types. The characteristics and requirements are shown in Table 6.7 Test method7.1 For the chemical composition test of steel, generally perform according to GB/T 4336, GB/T 20123 or general chemical analysis methods; for the arbitration, perform according to the provisions of GB/T 223.3, GB/T 223.9, GB/T 223.11, GB/T 223.18, GB/T 223.19, GB/T 223.23, GB/T 223.37, GB/T 223.58, GB/T 223.59, GB/T 223.60, GB/T 223.63, GB/T 223.64, GB/T 223.68, 7.2 The inspection items, sampling quantities, sampling methods and test methods for each batch of steel plates and strips shall comply with the requirements of Table 7.8 Inspection rules8.1 Inspection and acceptance of steel plates and strips shall be carried out by the supplier's quality supervision and inspection department. 8.2 Steel plates and steel strips shall be accepted in batches. Each batch consists of steel plates and steel strips of the same designation, the same heat number, the same thickness and the same heat treatment system. 8.4 The chemical composition and mechanical properties test results shall be rounded-off according to the rounding value comparison method in GB/T 8770. The rounding rules shall be in accordance with the provisions of GB/T 8170.9 Packaging, marking and quality certificateThe packaging, marking and quality certificate of steel plates and steel strips shall comply with the provisions of GB/T 247. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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