Comparison
8620 vs 20NiCrMo2-2
AISI/SAE 8620 and 20NiCrMo2-2 / 1.6523 are closely related case-hardening steels. After carburising and hardening you get a wear-resistant case and a tough core. The cross-reference is common – identity is not.
What they are
Case hardening – not quenching and tempering. 20NiCrMo2-2 is the EN designation; 1.6523 is the W.Nr. 8620 is the American designation. Nickel and Mo come in a lighter package than 18CrNiMo7-6.
- 20NiCrMo2-2 – 1.6523 – EN 10084
- AISI/SAE 8620 – closely related American designation
- Heavier alternative: 18CrNiMo7-6 / 1.6587
Delivery
Bar, typically soft annealed or +FP before carburising. We saw to size. The case hardening itself is done by the heat treater.
Frequently asked questions
- Is 8620 the same as 20NiCrMo2-2?
- No, not automatically. They are closely related and often cross-referenced. Chemistry, case requirements and certificate must be checked before substitution.
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