17-4 stainless steel for 17-4 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. 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,
The Stainless Steel Rat that prior to "The Stainless Steel Rat Wants You" Jim has in fact thwarted their plans twice already, making this their third encounter. The text can also be read to say that the second time he thwarted their plans was with the alien invasion so the third encounter also happened during "The Stainless Steel Rat Wants You" when Jim invaded their home planet. They live on a harsh, icy world; this existence forced them to eliminate all emotion from their culture. This society is also completely patriarchal, with women being treated as nothing more than property. During Jim's interactions with