Continuously hot-rolled steel sheet and strip for cold forming
1 Scope
This document specifies the dimensions, shape, technical requirements, inspections and tests, packaging, marking and inspection documents of continuously hot-rolled steel sheet and strip for cold forming.
This document is applicable to the continuously hot-rolled steel sheet and strip for cold forming as well as the steel sheet cut horizontally therewith and the slit wide strip cut vertically therewith (hereinafter referred to as steel sheet and strip) produced by Baoshan Iron & Steel Co., Ltd.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. The following documents contain provisions which, through reference in this text, constitute provisions of this document.
GB/T 222-2006 Permissible tolerances for chemical composition of steel products
GB/T 223 Methods for chemical analysis of iron, steel and alloy (Applicable parts)
GB/T 228.1-2021 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 232 Metallic materials - Bend test
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 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 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas (routine method)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric 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 300 General rules of package, mark and inspection document for continuously hot rolled steel sheet and strip
Q/BQB 301 Dimension, shape, weight and tolerances for continuously hot-rolled steel sheet and strip
3 Terms and definitions
No terms and definitions are listed in this document.
4 Classification and codes
4.1 The designation, nominal thickness, purpose and product categories of steel sheet and strip are shown in Table 1.
4.2 According to the surface treatment methods, steel sheet and strip are divided into pickled surface and emulsified surface.
4.3 By surface quality classes:
a) ordinary grade surface, FA;
b) superior grade surface, FB.
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and codes
5 Ordering information
6 Dimension, shape, weight and permissible deviations
7 Technical requirements
8 Inspections and tests
9 Packaging, marking and inspection documents
10 Rules of rounding off for numerical values
11 Annexes
Annex A (Informative) Reference of mechanical properties
Annex B (Informative) Comparison between similar designations in this document and relevant standards
