1 Scope
This standard specifies the size, appearance, technical requirements, test, inspection, packaging, marking and inspection documents of continuously hot rolled steel sheet and strip used for structure.
This standard is applicable to continuously hot rolled steel strip of carbon structural/low-alloy structural steel as well as transversally cut steel sheet and longitudinally cut steel strip (hereinafter referred to as steel sheet and strip) produced by Baoshan Iron & Steel Co., Ltd.. The majority of products are used for structural members of building, bridge, ship and vehicle delivery state, and part of the products are used for mechanical structure after further processed and heat treated.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 228-2002 Metallic Materials - Tensile Testing at Ambient Temperature
GB/T 229-1994 Metallic Materials - Charpy Notch Impact Test
GB/T 232-1999 Metallic Materials - Bend Test
GB/T 2975-1998 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing
GB/T 4336-2002 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy Steel (Routine Method)
GB/T 4340.1-1999 Metallic Materials - Vickers Hardness Test - Part 1: Test Method
GB/T 20066-2006 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition
GB/T 20123-2006 Steel and Iron - Determination of Total Carbon and Sulfur Content Infrared Absorption Method after Combustion in an Induction Furnace (Routine Method)
Q/BQB 300 General Rules for Packaging, Marking and Inspection Documents of Continuously Hot Rolled Steel Sheet and Strip
Q/BQB 301 Size, Appearance, Weight and Permissible Deviation of Continuously Hot Rolled Steel Sheet and Strip
3 Classification and Code
3.1 The designation, nominal thickness and application of steel sheet and strip are shown in Table 1.
3.2 The products may be classified into the following types according to surface treatment mode:
Pickled surface
Rolled surface
