Q/BQB 408-2023 Low carbon cold-rolled steel sheet and strip for cold forming
1 Scope
This document specifies the classification and codes, dimension, shape, weight, technical requirements, inspection and test, package, mark and inspection documents of low carbon cold-rolled steel sheet and strip for cold forming.
This document is applicable to the low carbon cold-rolled steel sheet and strip for cold forming (hereinafter referred to as steel sheet and strip) with a thickness of 0.17mm~3.5mm, and produced by Baoshan Iron & Steel Co. Ltd.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 223 Methods for chemical analysis of iron, steel and alloy
GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method
GB/T 232 Metallic materials - Bend test
GB/T 2523 Measuring method of surface roughness and peak count for cold-rolled metal sheet (strip)
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 5027 Metallic materials - Sheet and strip - Determination of plastic strain ratio
GB/T 5028 Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20126 Unalloyed steel - Determination of low carbon content - Part 2: Infrared absorption method after combustion in an induction furnace (with preheating)
Q/BQB 400 Package, mark and inspection document for cold-rolled product
Q/BQB 401 Dimension, shape, weight and tolerance for cold-rolled steel plates and sheets
3 Terms and definitions
No terms and definitions are listed in this document.
4 Classification and codes
4.1 See Table 1 for the classification of steel sheets and strips by the application.
4.2 See Table 2 for the classification of steel sheets and strips by the surface quality.
4.3 See Table 3 for the classification of steel sheets and strips by the surface structure.
4.4 The classification code for type of quenching and tempering degree of steel sheets and strips with designation of SPCC.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and codes 5 Ordering information 6 Dimension, shape, weight and permissible tolerance 7 Technical requirements 8 Inspection and test 9 Package, mark and inspection documents 10 Rules of rounding off for numerical values 11 Comparison of designations Annex A (Normative) Rigid materials Annex B (Informative) SPCC-X series specific designation hardness reference values Annex C (Informative) Comparison of similar designations between this document and relevant standards at home and abroad
