Kawasaki Steel Corporation

Osamu Haida

Toshihiko Emi

Fumio Sudo

Sumio Yamada

Shinobu Okano

Shuji Watanabe

Hiraku Sonoda

Hiroshi Ooi

Toshio Iwasaki

Akitoshi Fujiwara

Noboru Okamoto

Toshiaki Shiraishi

A desulfurizing agent for injection mainly consisting of lime powders having a particle diameter which allows at least 50 wt. % of the lime powders to pass through a screen mesh of 100 .mu.m and containing 0.015 to 1.0 wt. % of silicone oil surfactant, 10 to 40 wt. % of carbonate or hydroxide of alkaline earth metal, and 2 to 20 wt. % of carbon. The desulfurizing agent further contains 2 to 10 wt. % of at least one fluoride selected from the group consisting of fluoride of alkaline metal, fluoride of alkaline earth metal, cryolite, and sodium silicofluoride.

Desulfurizing agent for injection

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

Chiba, Japan

Osamu Haida