| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a weld metal with excellent toughness even at low temperatures around -20°C in high heat input welding of≥50kJ/cm. <P>SOLUTION: The submerged arc welding is executed by using a solid wire having a composition containing C: 0.01-0.18%, Si: 0-0.15%, Mn: 1.7-2.8%, Al: 0.02-0.1%, while N being regulated to be≤0.01%, and the balance Fe with inevitable impurities, and bond flux containing SiO<SB POS="POST">2</SB>: 4-22%, Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>: 2-12%, TiO<SB POS="POST">2</SB>: 5-26%, MgO: 8-42%, CaF<SB POS="POST">2</SB>: 2-11%, CaO: 2-9%, metal carbonate (CO<SB POS="POST">2</SB>corresponding value): 1-7%, B<SB POS="POST">2</SB>O<SB POS="POST">3</SB>: 0.2-0.9%, Mo: 0.1-0.7%, Fe: 5-25%, and Al: 0-1.2% with respect to the total flux. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
