17-4 STAINLESS STEEL– AMS 5643 – AISI 630 – UNS S17400
17-4 STAINLESS STEEL– AMS 5643 – AISI 630 – UNS S17400. 17-4 Stainless is a martensitic chromium-nickel-copper stainless steel in the solution treated (annealed) condition. It can be further hardened to various strength levels by a single precipitation hardening heat treatment that minimizes scaling and distortion.