This European Standard defines the term "steel" (see clause 2) and classifies steel grades into:
— non alloy, stainless steel and other alloy steels by chemical composition (see clause 3);
— main quality classes (see clause 4) defined by main property or application characteristics for non alloy, stainless and other alloy steels.
BS EN 10020:2000 history
2000BS EN 10020:2000 Definition and classification of grades of steel