| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a sintered flux for submerged arc welding which can further reduce the content of diffusible hydrogen in a welding metal while making the larger quantity of smelting slags to be utilizable. SOLUTION: In the manufacturing method for the sintered flux for the submerged arc welding which granulates and sinters after mixing flux raw material powder and a bonding agent, the flux raw material powder comprises iron- contained flux raw material powder containing an iron component of 5-10 mass%, welding slag powder or, furthermore, a slag making agent and/or a deoxidizer, the mixed product is made to contain the iron-contained flux raw material powder: 35-90%, Na<SB>2</SB>O: 4.0% or less in mass%, and, SiO<SB>2</SB>: 30-70%, a manganese oxide: 5-30% in terms of MnO, MgO: 3-30%, Al<SB>2</SB>O<SB>3</SB>: 2-20%, CaO: 10% or less, and one or two kinds or more of CaF<SB>2</SB>: 15% or less. COPYRIGHT: (C)2003,JPO
|
