| 摘要 |
A low temperature steel weld metal and a flux cored wire for providing the same are provided which has improved toughness when assembling components by performing gas shielded arc welding of a low temperature steel. The weld metal comprises C: 0.04 to 0.08 % by mass, Si: 0.20 to 0.50 % by mass, Mn: 0.80 to 1.70 % by mass, Ti: 0.030 to 0.080 % by mass, Ni: 0.30 to 3.00 % by mass, Mo: 0.01 to 0.20 % by mass, B: 0.0020 to 0.0070 % by mass, O: 0.040 to 0.070 % by mass, Al: 0.01 % by mass or less, and the balance of Fe and incidental impurities. The following equation is satisfied: ([C]×[Mn]×[Ti])/([Si]×[O]) = 0.20 to 0. 60, where [C] , [Mn] , [Ti] , [Si], and [O] represent contents of C, Mn, Ti, Si, and O, respectively. This can prevent occurence of ferrite side plates at the prior austenite grain boundary in the columnar structure of the weld metal, resulting in improved low temperature toughness. A titania-based flux cored wire for all position welding is also disclosed. |
