Product of a high-strength nitrogen containing fully austenitic cobalt steel having yield strengths above 600 N/MM2

US4865661A · kind A · utility

Assignee

• Fried Krupp · DE

Inventors

• Peter Dahlmann · Essen, DE
• Johannes Jachowski · Duisburg, DE
• Paul Pant · Essen, DE
• Gerald Stein · Essen, DE

Key dates

• Filing date: Oct 31, 1988
• Grant date: Sep 12, 1989
• Expiry date: Oct 31, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/30
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high strength austenitic steel having a yield strength above 600 N/mm.sup.2 at 02% permanent strain, containing about 0.5 to 1.5% by weight of nitrogen, about 6 to 12% by weight cobalt, and less than 5% by weight nickel. The steel is treated at about 1050.degree. C. to 1200.degree. C. and then quenched in water.