Steel materials having an excellent hydrogen induced cracking resistance

US4153454A · kind A · utility

Assignee

• Kawasaki Steel Corporation · JP

Inventors

• Toshihiko Emi · Chiba, JP
• Osamu Haida · Chiba, JP
• Shinobu Okano · Kurashiki, JP
• Shuji Watanabe · Adachi, JP
• Akitoshi Fujiwara · Toogane, JP
• Toshiaki Shiraishi · Chiba, JP
• Hiroshi Ooi · Tochigi, JP
• Toshio Iwasaki · Nagoya, JP
• Noboru Okamoto · Kurashiki, JP

Key dates

• Filing date: Dec 23, 1977
• Grant date: May 8, 1979
• Expiry date: Dec 23, 1997

Classification

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

Abstract

Steel materials having an excellent hydrogen induced cracking resistance when used under atmosphere containing H.sub.2 S, which contain 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 0.60 to 2.00% of Mn, 0.01 to 0.10% of Al, less than 0.0020% of S, Ca of 0.0020% to less than 0.0050%. These steel materials are increased in the tensile strength by additionally containing at least one of Cu, Ni, Cr, B, Mo, Nb, V, Zr and Ti. Furthermore the effect of addition of Ca is stabilized by adding rare-earth elements.