Jfe Steel Corporation

Kabushiki Kaisha Kobe Seiko Sho

Ryo Arao

Kazukuni Hase

Atsushi Takada

Yuki Toji

Katsuyuki Ichimiya

Ken Yamashita

Akio Ohmori

Shigeki Kitsuya

Koichi Nakashima

Naoya Hayakawa

Satoshi Igi

Daichi Izumi

Tomohiro Ono

Keiji Ueda

Peng Han

Shohei Kozuki

Provided is a steel material for high heat input welding having excellent welding heat affected zone low-temperature toughness at &#x2212;55&#xb0; C. in the case that the steel material is welded by high heat input welding with a heat input of more than 80 kJ/cm. The steel material may be used in low-temperature storage tanks, for example. The steel material for high heat input welding includes, in mass %, C: 0.04 to 0.09%, Si: 0.15 to 0.25%, Mn: 1.40 to 2.00%, P: 0.015% or less, S: 0.0005 to 0.0040%, Al: 0.030 to 0.080%, Ti: 0.005 to 0.025%, B: 0.0003 to 0.0020%, Ca: 0.0005 to 0.0030%, N: 0.0030 to 0.0060%, O: 0.0040% or less, Nb: 0.005% or less, and Mo: 0.005% or less, the balance being Fe and incidental impurities.

Steel material for high heat input welding

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Tokyo, Japan

Ryo Arao