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GB/T 11251-2020 PDF English

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GB/T 11251-2020: Alloy structural steel plate and strip
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GB/T 11251: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 11251-2020English135 Add to Cart 0-9 seconds. Auto-delivery Alloy structural steel plate and strip Valid
GB/T 11251-2009English125 Add to Cart 0-9 seconds. Auto-delivery Hot-rolled alloy structural steel plates Obsolete
GB/T 11251-1989English279 Add to Cart 3 days Hot-rolled alloy structural steel plates Obsolete

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GB/T 11251-2020: Alloy structural steel plate and strip

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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 H 46 Replacing GB/T 11251-2009 Alloy structural steel plate and strip Issued on. MARCH 06, 2020 Implemented on. OCTOBER 01, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Order content... 6 4 Size, shape, weight... 6 5 Technical requirements... 7 6 Test method... 11 7 Inspection rules... 12 8 Packaging, marking and quality certificate... 13 Appendix A (Normative) Size, shape, weight and allowable deviation of the steel strip... 14

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 11251-2009, Hot-rolled alloy structural steel plates. Compared with GB/T 11251-2009, the major technical changes of this Standard are as follows. -- Add alloy structural steel hot-rolled steel strip and related technical requirements; modify the thickness range of alloy structural steel hot- rolled steel plates (see Chapter 1); -- Modify the order content (see Chapter 3; Chapter 3 of version 2009); -- Add the delivery status of high-temperature tempering (see 5.2); -- Add Brinell hardness of steel plates that are delivered at high-temperature tempering (see 5.3.1); -- Delete the requirements of macro-structure (see 5.5 of version 2009); -- Add requirements for ultrasonic testing (see 5.7); -- Modify the provisions of surface quality (see 5.8; 5.8 of version 2009); -- Add the special requirements (see 5.9); -- Modify the batch rules (see 7.2; 7.2 of version 2009); -- Add requirements of rounding off of numerical values (see 7.5); -- Add the normative Appendix A, “Size, shape, weight and allowable deviation of the steel strip” (see Appendix A). 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. Jiangyin Xingcheng Special Steel Works Co., Ltd., Shougang Group Co., Ltd., China Metallurgical Information and Standardization Institute, Xiwang Metal Technology Co., Ltd. The drafters of this Standard. Huang Jun, Bai Yun, Luan Yan, He Guangxia, Wang Xiaoning, Shi Li, Zhang Lingtong, Li Wenshuang. The previous versions of the standards which are replaced by this Standard are. -- GB/T 11251-1989, GB/T 11251-2009. Alloy structural steel plate and strip

1 Scope

This Standard specifies the order content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of alloy structural steel plate and strip. This Standard applies to alloy structural steel hot-rolled steel plates whose thickness is 4 mm ~ 200 mm (hereinafter referred to as steel plates) and alloy structural steel hot-rolled steel strips (including shear steel plates) whose thickness is not greater than 12 mm and width is less than 600 mm (hereinafter referred to as steel strips).

2 Normative references

The 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 224, Determination of depth of decarburization of steels GB/T 228.1-2010, Metallic materials - Tensile testing - Part 2010.Method of test at room temperature GB/T 229, Metallic materials - Charpy pendulum impact test method GB/T 231.1, Metallic materials - Brinell hardness test - Part 1.Test method GB/T 232, Metallic materials - Bend test GB/T 247, General rule of package, mark and certification for steel plates (sheets) and strips GB/T 709-2019, Dimension shape weight and tolerances for hot-rolled steel plates and sheets

3 Order content

Contracts or orders which are ordered under this Standard shall include the following contents.

4 Size, shape, weight

4.1 The size, shape, weight and allowable deviation of the steel plate shall comply with the provisions of GB/T 709-2019; its thickness allowable deviation shall comply with the type A deviation.

5 Technical requirements

5.1 Designation and chemical composition 5.1.1 The common designations and chemical composition of the steel shall comply with the provisions of GB/T 3077. 5.1.2 The allowable deviation of chemical composition of the finished steel product shall comply with the provisions of GB/T 222. 5.2 Delivery status 5.2.1 Delivery status of steel plate 5.2.1.3 According to the requirement of the buyer, If it is indicated in the contract, the steel plate can be delivered by acid pickling. 5.2.1.4 Steel plates shall be trimmed for delivery; it shall be indicated in the contract when they are delivered in other edge conditions. Rolled steel plates can be free from longitudinal edge cutting. 5.2.2 Delivery status of steel strip Steel strips are generally delivered in a hot rolled status without trimming. According to the requirements of the buyer, steel strips of other special delivery status can be supplied. The specific requirements are negotiated by the supplier and the buyer and indicated in the contract. 5.3 Mechanical property 5.3.1 For steel plates that are delivered in high-temperature tempering status, the surface Brinell hardness shall comply with the provisions of GB/T 3077. 5.3.2 For steel plates that are delivered in the annealing status, the mechanical properties shall comply with the provisions in Table 1. 5.3.4 The mechanical properties of steel plates that are delivered in normalizing + tempering status shall be determined through consultation between the supplier and the buyer. 5.3.5 If it is negotiated between the supplier and the buyer, and indicated in the contract, the mechanical properties of the 25CrMnSi and 30CrMnSi steel plates in the quenching + tempering status of the sample can be determined. 5.4 Process performance Steel plates for stamping (specified in the contract), whose thickness is not greater than 10 mm, shall be subjected to a 180° bending test; the bending indenter diameter D = 2a (a is the thickness of the sample); the outer surface of the bending part of the sample shall not have cracks or layering. 5.5 Decarburized layer 5.5.2 Steel strip If it is required by the buyer and stated in the contract, the depth of the decarburized layer on the surface of the steel strip whose carbon content is greater than 0.30% can be checked; the depth of the total decarburized layer (full decarburized layer + partial decarburized layer) on each side shall meet the following requirements. 5.8 Surface quality 5.8.1 There shall be no cracks, bubbles, folds, inclusions, scars, and obvious scratches on the surface of the steel plate and steel strip; the steel plate and steel strip shall not have visual layering. 5.8.2 Steel plates and steel strips that are delivered by acid pickling are allowed to have unobvious rough surface and light-yellow film that is caused by acid pickling. 5.8.3 Steel strips are allowed to be delivered with partial surface defects; but the length of the defective part shall not exceed 6% of the total length of each coil of steel strip. 5.9 Special requirements. According to the requirements of the buyer, if it is negotiated between the supplier and the buyer, and specified in the contract, steel plates or steel strips of the following special requirements can be supplied.

6 Test method

The inspection items and test methods of the steel plate shall meet the requirements of Table 3.

7 Inspection rules

7.1 Inspection and acceptance 7.1.1 The delivery inspection and acceptance of steel plates and steel strips shall be carried out by the supplier's quality and technical supervision department. 7.2 Batch rules Steel plates and steel strips shall be inspected and accepted in batches; each batch shall consist of steel plates and steel strips of the same designation, the same furnace number, the same thickness, and the same heat treatment furnace (the continuous furnace is the same heat treatment system). 7.3 Sampling quantity and sampling position 7.3.1 The sampling quantity and sampling position of the steel plates shall comply with the requirements of Table 3. 7.4 Re-inspection and determination rules The re-inspection and determination rules of the steel plates and steel strips shall comply with the provisions of GB/T 17505. 7.5 Numerical rounding The test results of steel plates and steel strips shall be rounded by rounding-off value comparison method to a value that is consistent with the digit that is identified by the standard number of the specified value; the rounding rules shall be consistent with the provisions of GB/T 8170. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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