Steels with higher purity (lower S and P content) often intended for quenching and tempering. Alloy Quality Steels:
Based on the weight percentage of alloying elements.
It must contain other elements, but iron must be the main piece. It can be rolled, forged, or shaped by tools. The Two Main Steel Groups
Steels where the content of specific elements (like Manganese, Silicon, or Copper) does not exceed defined limit values. Stainless steels:
: Steels requiring closer control of properties like grain size or formability.
Non-alloy steels (often referred to as carbon steels) are those where the percentage of each alloying element does not reach a specific limit defined by the standard. EN 10020 includes a strict table outlining these boundary lines. For example, a steel is considered non-alloy if it contains less than: 1.65% Silicon (Si): 0.60% Copper (Cu): 0.40% Chromium (Cr): 0.30% Nickel (Ni): 0.30% Stainless Steels
Used for general structural or pressure purposes where specific mechanical properties are required but without the extreme purity of special steels.