Low carbon plus nitrogen, free-machining austenitic stainless steel

US4784828A · kind A · utility

Assignee

• Crucible Materials Corporation · US

Inventors

• John J. Eckenrod · Dorpsstraat, US
• Geoffrey O. Rhodes · Butler, US
• Kenneth E. Pinnow · Pittsburgh, US
• William E. Royer · LaFayette, US

Key dates

• Filing date: Aug 21, 1986
• Grant date: Nov 15, 1988
• Expiry date: Aug 21, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A resulfurized, chromium-nickel austenitic stainless steel having improved machinability resulting from low carbon and low nitrogen contents in combination with manganese and sulfur additions. The composition of the steel consists essentially of, in weight percent, carbon plus nitrogen total up to 0.065, preferably up to 0.040 or 0.056, chromium 16 to 30, preferably 17 to 19, nickel 5 to 26, preferably 6 to 14, sulfur 0.10 to 0.45, preferably 0.10 to 0.25, more preferably 0.25 to 0.45, manganese 0.75 to 2.0, silicon up to 1, phosphorus up to about 0.20, molybdenum up to 1.0 and copper up to 1.00, and balance iron and incidental impurities.