| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding material for a high Ni alloy having low thermal expansion coefficient characteristics and used, e.g. to piping for LNG transport and to provide a method for producing a welded pipe. SOLUTION: For obtaining low thermal expansion coefficient characteristics, a welding material having a fundamental componential composition of 35 to 40% Ni base, in which, from the viewpoints of the low temperature toughness and reheat cracking resistance of a weld metal, the contents of Ti and Nb are controlled and containing, by mass, 0.001 to 0.1% C, <=0.5% Si, 0.1 to 1% Mn, 35 to 40% Ni, 0.1 to 0.5% Ti and 0.1 to 0.5% Nb is used, and longitudinal seam welding for pipe making is performed by SAW welding, and circumference welding is performed by TIG or plasma welding.
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