1 Scope
This part specifies fundamental principles and requirements of classification for non-alloy steel, low-alloy steel and alloy steel according to main quality class and main property or application characteristics.
This part is applicable to classification of non-alloy steel, low-alloy steel and alloy steel according to main quality class and main property or application characteristics.
2 Normative References
Provisions of the following documents constitute some provisions of this part of GB/T 13304 through reference. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to these specifications are encouraged to research whether the latest editions of these labels are applied or not. For undated references, the latest editions of the normative documents are applicable to this part.
See Appendix A.
3 Terms and Definitions
For the purpose of this part, the following terms and definitions apply.
4 General Classification Of Non-alloy Steels
The general classification of non-alloy steels is as:
A) Classification according to main quality class of steel (see 4.1);
B) Classification according to main property or application characteristics of steel (see 4.2)
4.1 Classification according to main quality class
Non-alloy steels are classified according to the main quality class as:
A) Common-quality non-alloy steel (see 4.1.1);
B) Good-quality non-alloy steel (see 4.1.2);
C) Special-quality non-alloy steel (see 4.1.3).
4.1.1 Common-quality non-alloy steel
4.1.1.1 Brief
Common-quality non-alloy steel refers to steel that no special control quality requirement is specified in manufacturing process.
4.1.1.2 Definition
The steels that satisfy all the following conditions are common-quality non-alloy steels.
A) The steel is non-alloying one (meeting the requirements in the content limits of alloying elements in non-alloy steel specified by Part 1 of this standard);
B) Not specified in heat treatment;
Note: annealing, normalizing, stress relieving and softening treatment are not regarded as heat treatment.
C) If the product standard or the technical specifications specifies, the characteristic value hereof shall meet the following conditions:
