17-4 stainless steel
SAE Type 630 stainless steel is a grade of martensitic precipitation hardened stainless steel. It contains approximately 15–17.5% chromium and 3–5% nickel, as well as 3–5% copper. The name comes from the chemical makeup which is approximately 17% chromium and 4% nickel.Properties
17-4 can be heat treated to high levels of strength and hardness, and features corrosion resistance and machinability comparable to austenitic 304 stainless. Being martensitic, 17-4 is magnetic.
17-4 is capable of being hardened up to approximately 44 Rc when heat treated to condition H900.
Overaging improves resistance to stress corrosion cracking.Applications
Uses for 17-4 stainless steel include components which require high hardness and/or corrosion resistance at temperatures of up to. Specific applications for 17-4 include the petroleum and chemical industries, as well as use in aircraft parts.Composition
