Kawasaki Steel Corporation

Kao Corporation

Toshio Iwasaki

Toshihiko Emi

Shinobu Okano

Kazuo Kita

Koichi Yamane

Hiroshi Ooi

Osamu Haida

Shuji Watanabe

Toshiaki Shiraishi

Noboru Okamoto

Koichi Ishii

Tadayoshi Takeno

Akitoshi Fujiwara

Koichi Hirase

A metal cleaning composition is provided comprising: a nonionic active agent and/or an anionic active agent having an HLB value ranging from 3 to 18; and a carboxylic acid or salt thereof represented by the formula,

Metal cleaning compositions

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.

Steel materials having an excellent hydrogen induced cracking resistance

Growing community of inventors

Kurashiki, Japan

Toshio Iwasaki