GB/T 711-2017Hot-rolled quality carbon structural steel plates, sheets and strips (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009. This Standard combined and modified the following standards like GB/T 710-2008 Hot- Rolled Quality Carbon Structural Steel Sheets and Strips, GB/T 711-2008 Hot-rolled Quality Carbon Structural Steel Plates, Sheets and Wide Strips. This Standard replaced GB/T 710-2008 Hot-Rolled Quality Carbon Structural Steel Sheets and Strips, GB/T 711-2008 Hot-rolled Quality Carbon Structural Steel Plates, Sheets and Wide Strips; compared with GB/T 710-2008 and GB/T 711-2008, this Standard has the major technical changes as follows:

--- Cancel the relevant brand of boiling steel;

--- Cancel the pull-edge level;

--- Increase three brands of 35Mn, 55Mn, 70Mn (see Table 1, Table 2, Table 3);

--- Tighten the control harmful elemental sulfur in steel (see Table 1);

--- Adjust the delivery status of some brands (see Table 2). This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee for Standardization of Steel (SAC/TC 183). Drafting organizations of this Standard. Chongqing Iron & Steel Company Limited, Angang Steel Company Limited, China Metallurgical Information and Standardization Institute, Shougang Co., Ltd., Xinyu Iron & Steel Co., Ltd., and Hebei Iron and Steel Co., Ltd. Tangshan Branch. Chief drafting staffs of this Standard. Du Dasong, Ye Guohua, Pu Zhimin, Zhang Weixu, Shi Li, Liao Sangsang, Deng Cuiqing, Xie Caozhong, Guan Jichun, Yang Juanyu, Gao Yan, Wang Xin, Liu Xuyuan, Su Haolu. The historical editions replaced by this Standard are as follows:

--- GB/T 710-1998, GB/T 710-1991, GB/T 710-2008;

--- GB/T 711-1985, GB/T 711-1988, GB/T 711-2008. Hot-Rolled Quality Carbon Structural Steel Plates Sheets and Strips

1 Scope

China's national standard for hot-rolled quality carbon structural steel plates, sheets and strips. Quality carbon steel is distinguished from ordinary carbon structural steel by control rather than by composition: the carbon range is narrower, the sulfur and phosphorus limits are lower, and the composition is guaranteed rather than merely typical. That is what makes it usable for parts that will be heat treated or heavily formed, since a steel whose carbon varies from heat to heat cannot be quenched and tempered to a predictable hardness, and one carrying sulfur cracks when it is bent. The plate and strip covered here goes into machine components, pressed parts, drums and gas cylinders, and into everything subsequently hardened. The standard specifies the dimensions, appearance, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate, and applies to such plates, sheets and strips of thickness up to 100 mm and width 600 mm and above.

This Standard specifies the dimension, appearance, weight, technical requirements, test methods, inspection rules, package, marking and quality certificate of the hot- rolled quality carbon structural steel plates sheets and strips. This Standard is only applicable to the hot-rolled quality carbon structural steel plates sheets and strips with thickness no greater than 100mm, width no less than 600mm (hereinafter referred to as steel sheets and strips).

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products

GB/T 223.5 Methods for Chemical Analysis of Iron, Steel and Alloy - The Reduced Molybdosilicate Spectrophotometric Method for The Determination of Acid-Soluble Silicon Content

GB/T 223.12 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Carbonate Separation-Diphenyl Carbazide Photometric Method for The Determination of Chromium Content

GB/T 223.19 Methods for Chemical Analysis of iron, Steel and Alloy - The Neocuproine-Chloroform Extraction Photometric Method for the Determination of Copper Content

GB/T 223.23 Methods for Chemical Analysis of Iron, Steel and Alloy - The Dimethylglyoxime Spectrophotometric Method for The Determination of Nickel Content

3 Ordering Contents

Contracts or orders for purchasing products under this Standard shall include the following contents.

4 Dimension, Appearance, Weight

The dimension, appearance, weight and permissible deviation of steel sheet and strip shall conform to the provisions of GB/T 709.

6 Test Methods

6.1 The analysis method for chemical compositions of steel shall be performed as per the provisions of GB/T 223.5, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T 223.37, GB/T 223.59, GB/T 223.64, GB/T 223.68, GB/T 223.86, GB/T 4336, GB/T 20123, GB/T 20125, and general method; however, the arbitration shall be performed as per the provisions of GB/T 223.5, GB/T 223.12, GB/T 223.19, GB/T 223.23, GB/T 223.37, GB/T 223.59, GB/T 223.64, GB/T 223.68, GB/T 223.86.

7 Inspection Rules

7.1 The quality of steel plate and strip shall be inspected and accepted by the supplier's Quality and Technology Supervision Department.

7.2 The steel plate and strip shall be accepted in batches; each batch consists of the steel plates and strips with the same brand, the same furnace number, the same thickness, the same rolling system or heat treatment; the weight of each batch shall not exceed 60t.

7.3 The re-inspection of steel plate and strip shall conform to the provisions of GB/T 17505.

7.4 The sampling quantity and sampling method of steel plate and strip shall conform to the provisions of Table 7.

7.5 The mechanical properties and chemical composition test results shall be rounded off by using the rounding comparison method. The rounding off rules shall be performed as per the provisions of GB/T 8170.

8 Package, Marking and Quality Certificate

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