Nippon Steel Corporation

Hajime Ishikawa

Hiroshi Tamehiro

Hiroyuki Ogawa

Takuya Hara

Akihiko Takahashi

Yoshio Terada

Rikio Chijiiwa

Koichi Shinada

Yoshinori Ogata

Isamu Kimoto

A steel plate comprising by weight C: 0.01 to 0.1%, Si: 0.02 to 0.5%, Mn: 0.6 to 2.0%, P&lt;0.020%, S&lt;0.010%, O&lt;0.005%, Cr: 0.1 to 0.5%, Cu: 0.1 to 1.0%, Al: 0.005 to 0.05%, and Ca: 0.0005 to 0.005%, Mn, S, and O having respective contents regulated to satisfy a requirement represented by the formula Mn.times.(S+O).ltoreq.1.5 .times.10.sup.-2, and 0.01 to 0.1% in total of at least one member selected from the group consisting of Nb, V, and Ti with the balance consisting of Fe and unavoidable impurities. This steel plate has excellent corrosion resistance and sulfide stress cracking resistance in an environment containing carbon dioxide gas and hydrogen sulfide.

Steel plate having excellent corrosion resistance and sulfide stress

A wire for gas metal arc welding containing 0.01 to 0.06 wt % of C, 0.10 to 0.60 wt % of Si, 0.9 to 3.1 wt % of Mn, 0.7 to 2.0 wt % of Cr, 0.005 to 0.06% of Ti, not greater than 0.08 wt % of Al and if necessary, 0.05 to 0.30 wt % of Cu, and the balance of Fe and unavoidable impurities. This wire improves the selective corrosion resistance and the low temperature toughness of the resulting weld metal, and is particularly suitable for circumferential welding of line pipes for transporting CO.sub.2 -containing petroleum, natural gases or CO.sub.2.

Line pipe metal arc welded with wire alloy

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Kimitsu, Japan

Hajime Ishikawa