1.6580

30CrNiMo8

The 1.6580 (30CrNiMo8) is a [[glossary:verguetungsstahl|quenched and tempered steel]]: [[glossary:haerten|hardening]] plus [[glossary:anlassen|tempering]] gives it high strength with good [[glossary:zaehigkeit|toughness]] — the material for shafts, gears, and highly stressed parts. When welding, the [[glossary:waermeeinflusstaue|heat-affected zone]] hardens. Typical analysis: 0.3 % C, 2 % Cr, 0.65 % Mn, 0.4 % Mo, 2 % Ni, 0.25 % Si. For higher [[glossary:verschleissschutz|wear protection]], three hard-facing options are available: S Fe 1 (martensitic, approx. 300–400 HB, machinable), S Fe 2 (wear-resistant and tough, approx. 50–55 HRC, conditionally machinable) and S Fe 15 ([[glossary:karbid|carbide]]-rich, approx. 55–65+ HRC, not machinable).