Welding material for ferritic heat resistant steel, welded joint for ferritic heat resistant steel, and method for producing welded joint for ferritic heat resistant steel

摘要

When welding ferritic heat resistant steels containing B, a weld material for ferritic heat resistant steel, weld joint for ferritic heat resistant steel, and weld for ferritic heat resistant steel capable of forming a weld metal having high creep strength and toughness A method for manufacturing a joint is provided. The weld material for ferritic heat resistant steel according to the present embodiment is mass%, C: 0.06 to 0.10%, Si: 0.1 to 0.4%, Mn: 0.3 to 0.7%, Co: 2.6-3.4%, Ni: 0.01-1.10%, Cr: 8.5-9.5%, W: 2.5-3.5%, Nb: 0.02- Contains 0.08%, V: 0.1-0.3%, Ta: 0.02-0.08%, B: 0.007-0.015%, N: 0.005-0.020% The balance is composed of Fe and impurities, and has a chemical composition satisfying the formula (1). 0.5 ≦ Cr + 6Si + 1.5W + 11V + 5Nb + 10B-40C-30N-4Ni-2Co-2Mn ≦ 10.0 (1)