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
The Stainless Steel Rat the past to 1975, making events happen in and around 34,573 (in the 346th century) – although Professor Coypu also mentions that they are now using a different calendar to the Gregorian calendar. Specifics of the new calendar are never mentioned. "The Stainless Steel Rat", "The Stainless Steel Rat Saves the World" and "The Stainless Steel Rat for President" were adapted into comic strip form in early issues of "2000 AD", written by Kelvin Gosnell and drawn by Carlos Ezquerra. Ezquerra drew Jim with an appearance modelled on the actor James Coburn. They appeared in the following issues of "2000