This standard specifies the production and inspection requirements for the following six grades of alloy steel forgings:
Grades A, B and C forgings: which are subjected to annealing, normalizing and normalizing + tempering treatment;
Grades D, E and F forgings: which are subjected to annealing, normalizing, normalizing + tempering treatment and quenching + tempering treatment.
This standard is applicable to Grade A ~ Grade F alloy steel forgings of rolling stock and other railway equipment.
2 Normative References
The following standards contained provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, all editions indicated are valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the following standards.
GB/T 222-1984 Method of Sampling Steel for Determination of Chemical Composition and Permissible Variations for Product Analysis
GB/T 228-1987 Metallic Materials - Tensile Testing
YB/T 5148-1993 Metal - Methods for Estimating the Average Grain Size
ASTM A370-95 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
3 Requirements
3.1 Forged steel shall be produced in electric furnace or basic oxygen furnace.
3.2 The chemical composition of steel shall meet the requirements of product design drawing or product technical specification; if there is any special requirement, it shall be determined through consultation between the manufacturer and purchaser.
