Specs: ASTM-A-564, AMS 5643
Stainless Steel 17-4 is a precipitation-hardening martensitic Stainless Steel, which has corrosion resistance comparable to austenitic varieties, but can be precipitation hardened to even higher strengths than the other martensitic grades. 17-4 Stainless is generally composed of about 17% Chromium and 4% Nickel.
The strength and hardness of this material is developed through heat treating, making 17-4 Stainless ideal for applications requiring ease of fabrication with reliable strength and hardness.
Because of its strong corrosion resistance, good machining capabilities and high strength, 17-4 Stainless is used in applications for aerospace, chemical processing equipment, oil and petroleum refining equipment, food processing equipment, as well as general metalworking.