17-4 stainless steel 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. 17-4 is capable of being hardened up to approximately 44 Rc when heat treated to condition H900. Overaging (aging beyond the peak strength condition) improves resistance to stress corrosion cracking. Uses
Stainless Steel Studios Stainless Steel Studios Stainless Steel Studios (SSSI) was a video game development company, started in 1997 by Rick Goodman and Dara-Lynn Pelechatz. The company was based in Cambridge, Massachusetts, and focused on the development of real-time strategy games. Stainless Steel was started in October 1997 by Rick Goodman and Dara-Lynn Pelechatz (Director of Operations). The name "Stainless Steel" was thought up by Rick Goodman on a returning flight from California. Dara-Lynn Pelechatz the Director of Operations said in an interview with GameSpy: While returning on a flight from California, Rick saw the Sky Mall catalog. Well he decided he was