Nippon Steel Sumitomo Metal Corporation

Shinsuke Usui

Yoshiyuki Watanabe

Rikio Chijiiwa

Kazuhiro Fukunaga

A steel for welding includes steel components in which Pis less than or equal to 0.065%, CeqH is less than or equal to 0.225%, FB is greater than or equal to 0.0003%, and Bp is 0.09% to 0.30%. In the steel for welding, in a thickness center portion of a cross-section in a thickness direction, the number of oxide particles having an equivalent circle diameter of 2 &#x3bc;m or greater is less than or equal to 20 particles/mmand the number of Ti oxides having an equivalent circle diameter of 0.05 &#x3bc;m to 0.5 &#x3bc;m is 1.0&#xd7;10particles/mmto 1.0&#xd7;10particles/mm.

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Tokyo, Japan

Shinsuke Usui