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
Olympic Steel Olympic Steel Olympic Steel, Inc. is a steel processor based in Cleveland, Ohio. The company processes and distributes processed carbon, coated and stainless flat-rolled sheet, and coil and plate steel products primarily in the United States. The company owns 17 facilities throughout the eastern-half of the United States and 1 in Mexico. Its services include cutting-to-length, slitting, and shearing. It also offers value-added processes such as blanking, tempering, plate burning, precision machining, welding, and fabricating and painting to process steel to specified lengths, widths, and shapes. It also owns two subsidiaries, Chicago Tube and Iron and Integrity Stainless. Olympic Steel