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: Steels that do not meet the definitions of non-alloy or stainless steels. Quality Classes

This category includes any steel that does not meet the definition of stainless steel but contains at least one alloying element at a concentration equal to or higher than the limits specified in the standard’s reference table. Main Quality Classes en 10020 pdf

Beyond chemical makeup, EN 10020 classifies steels by their "quality class," which refers to their intended application and required properties: : Steels that do not meet the definitions

The standard uses (mass %) to differentiate categories: A steel grade called "X5CrNi18-10" might have been

Before EN 10020, different countries used disparate naming conventions and classification systems. A steel grade called "X5CrNi18-10" might have been classified differently in Germany (DIN), France (NF), or the UK (BS). EN 10020 harmonized this by providing a universal framework for defining what a "steel grade" actually is.

Common quality non-alloy steels used in general engineering without specific heat treatment requirements.