This standard specifies the classification, codes, ordering information, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and product quality certificate of hot rolling vhecker steel sheet and strip.
This standard is applicable to the rhombic, lenticular, round bean-shaped and combined hot rolling checker steel sheet and strip in thickness of 1.4mm to 16.0mm (hereinafter referred to as "steel sheet and strip").
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 228.1 Metallic Materials — Tensile Testing — Part 1: Method of Test at Room Temperature
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 700 Carbon Structural Steels
GB/T 709 Dimension, Shape, Weight and Tolerances for Hot-rolled Steel Plates and Sheets
GB/T 712 Ship and Ocean Engineering Structural Steel
GB/T 1591 High Strength Low Alloy Structural Steels
GB/T 2975 Steel and Steel Products — Location and Preparation of Test Pieces for Mechanical Testing
GB/T 4171 Atmospheric Corrosion Resisting Structural Steel
GB/T 8170 Rules of Rounding Off for Numerical Values & Expression and Judgment of Limiting Values
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
3 Classification and Code
3.1 Classification according to edge state are as follows:
a) Trimmed: EC;
b) Untrimmed: EM.
3.2 Classification according to checker shape are as follows:
a) Rhombic: LX;
b) Lenticular: BD;
c) Round bean-shaped: YD;
d) Combined: ZH.
GB/T 33974-2017 The following standards are cited：
