High strength, low alloy, heat resistant steel

US6379611B1 · kind B1 · utility

Assignees

• SUMITOMO METAL INDUSTRIES, LTD. · JP
• Mitsubishi Electric Corporation · JP

Inventors

• Nobuyoshi Komai · Nagasaki, JP
• Fujimitsu Masuyama · Nagasaki, JP
• Tomomitsu Yokoyama · Tokyo, JP
• Hiroyuki Hirata · Tokyo, JP
• Kaori Kawano · Neyagawa, JP
• Takao Kan · Amagasaki, JP

Key dates

• Filing date: Aug 18, 2000
• Grant date: Apr 30, 2002
• Expiry date: Aug 18, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K35/3093
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high strength, low alloy, heat resistant steel having excellent weldability has an average crystal grain diameter of at most 110 &mgr;m and consists essentially of, by mass %: C: 0.03-0.15%, Si: at most 1%, Mn: at most 2%, P: at most 0.03%, S: at most 0.03%, Ni: at most 0.5%, Cu: at most 0.5%, Cr: 1.8-2.8%, V: 0.1-0.3%, Nb: 0.01-0.08%, Mo: 0.05-0.35%, W: 1.2-1.8%, Ti: 0.001-0.05%, B: 0-0.02%, Al: at most 0.1%, O: at most 0.1%, N: in an amount satisfying the formula [%N]≦[%Ti]+5[%B]+0.004, and a remainder of unavoidable impurities.