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. Its strength and moderate corrosion resistant properties are maintained in service temperatures up to the 600° F to 800° F range. The alloy should not be used in the solution treated (annealed) condition. Bars, Wire, and Forgings are usually a single-melt product offered to AMS 5643 for aerospace applications. A CEVM (Consumable Electrode Vacuum Melt) or VAR (Vacuum Arc Remelt) product is specified in AMS 5622. Both specifications require that bars and forgings be restricted to 8” Diameter or less, or 8” least distance between parallel sides. A provision is included to allow larger sizes, provided that the Buyer and Seller agree upon mechanical properties for the size in question.