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1.4542

X5CrNiCuNb16-4

The 1.4542 (X5CrNiCuNb16-4 (17-4PH)) is a martensitic, precipitation-[[glossary:haerten|hardening]] stainless steel: it gets hard not via [[element:C|carbon]], but through fine [[element:Cu|copper]] and [[element:Nb|niobium]] precipitates. Strength only comes from [[glossary:auslagerung|aging]] after [[glossary:loesungsgluehen|solution annealing]]. Typical composition: 0.04 % C, 16 % Cr, 0.5 % Mn, 0.2 % Mo, 4 % Ni, 0.5 % Si.

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