Within this category, EN 10020 further distinguishes between:
: Verifying that a supplier’s "non-alloy" steel actually fits the technical definition. en 10020 pdf
Common quality non-alloy steels used in general engineering without specific heat treatment requirements. Within this category
Steels where the content of specific elements (like Manganese, Silicon, or Copper) does not exceed defined limit values. Stainless steels: en 10020 pdf
: Classified by their specific carbon and alloying element content. Other Alloy Steels