Jfe Steel Corporation

Yamato Sewing Machine Seizo Co., Ltd.

Akiyoshi Tsuji

Makoto Suzuki

Nobuyuki Ishikawa

Nobuo Shikanai

Masaki Okamoto

Norio Nakata

Tomohiro Matsushima

Shinichi Kakihara

Hiromichi Kurata

Yutaka Awajiya

Yasuji Yamamoto

Nobuyuki Kawata

Hiroshi Awajiya

A steel plate for line pipes containing, in terms of % by weight, C: 0.02 to 0.06%, Si: 0.5% or less, Mn: 0.8 to 1.6%, P: 0.008% or less, S: 0.0008% or less, Al: 0.08% or less, Nb: 0.005 to 0.035%, Ti: 0.005 to 0.025%, and Ca: 0.0005 to 0.0035%, and optionally contains one or more of Cu: 0.5% or less, Ni: 1% or less, Cr: 0.5% or less, Mo: 0.5% or less and V: 0.1% or less, and has a CP value of 0.95 or less represented by CP=4.46C(%)+2.37Mn(%)/6+{1.18Cr(%)+1.95Mo(%)+1.74V(%)}/5+{1.74Cu(%)+1.7Ni(%)}/15+22.36P(%), and a Ceq value of 0.30 or more represented by Ceq=C(%)+Mn(%)/6+{Cr(%)+Mo(%)+V(%)}/5 +{Cu(%)+Ni(%)}/15.

Steel plate and steel pipe for line pipes

Growing community of inventors

Kawasaki, Japan

Akiyoshi Tsuji