This Part specifies the basic criteria for classifying steels according to their chemical composition and specifies the basic limit values for the content of alloying elements in non-alloy steels, low-alloy steels and alloy steels. This standard applies to the classification of steels according to their chemical composition.
GB/T 13304.1-2008 history
2008GB/T 13304.1-2008 Steels classification.Part 1:Classification of according to chemical composition