This standard specifies the order contents, dimension, shape and weight, technical requirements, test methods, inspection rules, as well as packaging, marking and quality certificate of alloy structural steel plate and strip.
This standard is applicable to the hot-rolled plate of alloy structural steel (hereinafter referred to as “steel plate”) having a thickness of 4~200mm and the hot-rolled strip of alloy structural steel (including sheared steel plate) (hereinafter referred to as “steel strip”) having a thickness not greater than 12mm and a width less than 600mm.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 224 Determination of depth of decarburization of steel
GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1: 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 tolerance for hot-rolled steel strip, plate and sheet
GB/T 2970-2016 Method for ultrasonic testing of thicker steel plates
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 3077 Alloy structure steels
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams
GB/T 17505 Steel and steel products - General technical delivery requirements
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
GB/T 34474.1 Determination of banded structure of steel - Part 1: Micrographic method using standards diagrams
3 Order contents
Contracts or orders made based on this standard shall cover the following items:
a) No. of this standard;
b) product name;
c) grade;
d) dimension and thickness precision (wherein, thickness precision is only applicable to steel strip, see Table A.1);
e) delivery weight (or quantity);
f) delivery condition (see 5.2);
g) edge condition (see 5.2.1.4, 5.2.2 and Table A.2);
h) processing purpose;
i) special requirements.
4 Dimension, shape and weight
4.1 The dimension, shape, weight and tolerance of steel plate shall meet the requirements of GB/T 709-2019, wherein, the thickness tolerance shall conform to Category A deviation.
4.2 The dimension, shape, weight and tolerance of steel strip shall meet the requirements of Annex A.
GB/T 11251-2020 The following standards are cited：
