The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 1979
Filed:
Dec. 23, 1977
Toshihiko Emi, Chiba, JP;
Osamu Haida, Chiba, JP;
Shinobu Okano, Kurashiki, JP;
Shuji Watanabe, Kurashiki, JP;
Akitoshi Fujiwara, Togane, JP;
Toshiaki Shiraishi, Chiba, JP;
Hiroshi Ooi, Kurashiki, JP;
Toshio Iwasaki, Kurashiki, JP;
Noboru Okamoto, Kurashiki, JP;
Kawasaki Steel Corporation, Kobe, JP;
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.