Nippon Steel Corporation

Yutaka Tsuchida

Yoshiro Koyasu

Yuzo Hosoi

Nobukazu Suzuki

Shozo Sekino

Shoji Murota

Noboru Shinoda

Mizuo Sakakihara

Improved toughness of forging is obtained without quenching and tempering by controlling the steel composition to: 0.05% to less than 0.15% C.; 0.10-1.00% Si; 0.50-3.00% Mn; 1.60-4.20% Mn+Cr; 0.010-0.030% Ti; 0.005-0.0030% B; 0.01-0.05% Al; and 0.0060% or less of N.

Non-heat refined steel bar having improved toughness

A heat-resistant alloy suitable for welded structures, particularly suitable for nuclear reactors, and free from the adverse effect of the cobalt used therein, which alloy has a basic composition comprising; 0.01-0.2% C, not more than 0.50% Si, not more than 0.50% Mn, 10 to 25% Cr, not more than 0.030% B, not more than 0.50% Zr, not more than 20% of (Mo+1/2W), 0.001 to 0.04% Y, not more than 2.0% Al, and not more than 1.0% Ti, with the balance being Ni and unavoidable impurities.

Heat-resistant alloy for welded structures

Growing community of inventors

Kawasaki, Japan

Yutaka Tsuchida