| 摘要 |
PROBLEM TO BE SOLVED: To obtain a welding part with high temperature elongation and excellent toughness even with large heat input one layer welding by using a specific composition of wire and flux, restricting B volume shifted from the flux, the wire and a steel plate into the welding metal, and appropriating the wire component and the flux base level. SOLUTION: HT590 refractory steel including 0.6-1.2 wt.% Mo and 0.001-0.05 wt.% Nb is welded by combining the flux for satisfying formulae I-VIII and the wire which satisfies formulae III-VIII and includes 0.01-0.13 wt.% C, 0.005-0.15 wt.% Si, 1.2-2.2 wt.% Mn, 0.60 wt.% or less Mo, 0.05 wt.% or less Nb, 0.02 wt.% or less V, 0.03 wt.% or less Ti, 0.0005 wt.% or less B and the balance of Fe. In this case, in the formula II, each component means the content in the flux. In the formulae IV and VI, [MO]W, [MO]P, and [Mo]F mean Mo contents in the wire, the base material and the flux respectively, which can be applied similarly to B and B2O3. Also, aW, aP, aF mean shifted rates of Mo and B to the welding metal in the wire, the base material, and the flux respectively. In the formula VIII, each component means the content in the welding metal.
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