High Cr Ni-based alloy welding wire, shielded metal arc welding rod, and weld metal formed by shielded metal arc welding

• Main Authors: Sango, Tetsuya, Kawasaki, Kenji, Saito, Teiichiro, Konishi, Akira, Sano, Yusuke, Ogawa, Norihito, Toyoda, Masahiko, Asada, Seiji, Takatsu, Tamao, Kawaguchi, Seiichi
• Format: Patent
• Language: English
• Published: 09.06.2020
• Subjects: ALLOYS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; FERROUS OR NON-FERROUS ALLOYS; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WELDING; WORKING BY LASER BEAM

Provided is a high Cr Ni-based alloy welding wire with which tensile strength and weld cracking resistance of a welded portion, the integrity of the microstructure of a welded metal, and inhibition of scale generation are improved. The high Cr Ni-based alloy welding wire is configured to have an alloy composition comprising, by mass, C: 0.04% or less, Mn: 7% or less, Fe: 1 to 12%, Si: 0.75% or less, Al: 0.01 to 0.7%, Ti: 0.01 to 0.7%, Cr: 25.0 to 31.5%, Ta: 1 to 10%, Mo: 1 to 6%, and N: 0.1% or less, and as inevitable impurities, Ca + Mg: less than 0.002%, P: 0.02% or less, O: 0.01% or less, S: 0.0015% or less, H: 0.0015% or less, Cu: 0.08% or less, and Co: 0.05% or less, and the balance: Ni. Then, the high Cr Ni-based alloy welding wire is configured such that the contents of S, Ta, Al, and Ti satisfy the following relation (1) and the contents of Ta, Mo, and N satisfy the following relation (2) : 12000 ¢ S + 0.58 ¢ Ta - 2.6 ¢ Al - 2 ¢ Ti ‰¤ 19.3 Ta + 1.6 ¢ Mo + 187 ¢ N ‰¥ 5.7