17-4 stainless steel
SAE type 630 stainless steel (more commonly known as 17-4; also known as UNS 17400) is a grade of martensitic precipitation-hardened stainless steel. It contains approximately 15–17.5% (17) chromium and 3–5% (4) nickel, as well as 3–5% copper.
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.
Uses for 17-4 include components which require high hardness and/or corrosion resistance at temperatures of up to 600 °F (316 °C). Specific applications for 17-4 include the petroleum and chemical industries, as well as use in aircraft parts.
|C||a Mn||P||S||Si||Cr||Ni||Cu||Nb, Ta|
|0.07 max.||1.2 max.||0.040 max.||0.030 max.||1.0 max.||15.0-17.5||3.0-5.0||3.0-5.0||0.15-0.45|
- "Type 630; 17 Cr-4 Ni; UNS 17400" (PDF). Outokumpu.com. Retrieved June 5, 2016.
- "North American Stainless - Long Products Stainless Steel Grade Sheet" (PDF). North American Stainless. Retrieved June 5, 2016.
- "Stress Corrosion Properties of High-Strength Precipitation Hardening Stainless Steels in 3.5% Aqueous Sodium Chloride Solution" (PDF). Retrieved September 6, 2016.
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