| 摘要 |
PROBLEM TO BE SOLVED: To provide a baked flux for submerged arc welding of a high-tensile steel capable of obtaining a weld metal which has low diffusible hydrogen amount, has no weld defect and has favorable weld workability and excellent machine performance.SOLUTION: A baked flux for submerged arc welding of a high-tensile steel contains: in mass% based on the total mass of the baked flux, 10-20% SiO, 8-20% CaO, 20-30% MgO, 21-35% AlO, 10-18% CaF, 0.2-1.8% LiCO, 2-7% total of COconversion value of LiCOand that value of one or both of CaCOand MgCO, 0.3-1.0% Si, 0.2-0.9% Mn, and 0.8-4.5% total of one or both of NaO and KO.SELECTED DRAWING: None |
