Nkk Corporation

Jfe Steel Corporation

Satoshi Kohira

Atsushi Watanabe

Yoshihiro Hosoya

Yoshiteru Kikuchi

Hiromi Nakamura

Seishi Tsuyama

Ryo Kawabata

Ikuhiro Sumi

Shuji Kanetoh

Daijiro Koyanagi

Shinichi Akai

Method for blowing oxygen in converter and top-blown lance for blowing oxygen

Blister-resistant steel sheet consists essentially of 0.0005 to 0.003 wt. % C, 0.10 to 2.2 wt. % Mn, 0.6 wt. % or less Si, 0.07 wt. % or less P, 0.025 wt. % or less S, 0.02 to 0.06 wt. % of sol. Al, 0.0035 wt. % or less N, 0.003 wt. % or less O, [(48/14)N+(48/32)S+4.times.(48/12)C] wt. % or less Ti and the balance being Fe and inevitable impurities; and smaller one of either Ti (wt. %) or [(48/14)N+(48/32)S] (wt. %) being [0.002 t.sup.2 +0.003] or more, where t is a thickness (mm) of the steel sheet. Method for producing blister-resistant steel sheet comprises preparing a cold rolled steel sheet having the composition of described above, and continuously annealing or continuous hot dip galvanizing by heating the steel sheet from room temperature to 650.degree.-720.degree. C. at a rate of 20.degree. C. sec or more and further to the soaking temperature above recrystallization temperature at a rate of 1.degree.-5.degree. C./sec.

Blister-resistant steel sheet and method for producing thereof

Growing community of inventors

Fukuyama, Japan

Satoshi Kohira