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Steel is an iron-carbon alloy with a maximum carbon content of 2% by mass. The steels achieve their intended physical and mechanical properties through various hardening, annealing and tempering processes. It is also possible to harden the edge zone by surface hardening, case hardening or nitriding. Well-known steel grades are structural steels, free-machining steels, case-hardening steels, nitriding steels, tempering steels, tool steels and stainless steels.

Phosphating offers low to moderate corrosion protection, improves adhesion, reduces friction and wear, and provides electrical insulation. Although there is significant overlap in terms of its intended use, phosphating is not classified as a passivation process.