Austenitic heat-resistant steel Welded metal, welded joints, austenitic heat-resistant steel welding materials, and methods for manufacturing welded joints

摘要

Provided is an austenitic heat-resistant steel weld metal having low sensitivity to high-temperature cracking and excellent creep strength. Austenite-based heat-resistant steel weld metal has a chemical composition of mass%, C: 0.06% to 0.14%, Si: 0.1% to 0.6%, Mn: 0.1% to 1.8. %, P: 0.025% or less, S: 0.003% or less, Ni: 25% to 35%, Cr: 20% to 24%, W: more than 4.5% and 7.5% or less, Nb: 0.05% to 0.5%, V: 0.05% to 0.4%, N: 0.1% to 0.35%, Al: 0.08% or less, O: 0.08% or less, B: It contains 0.0005 to 0.005%, and fn1 represented by the following formula (1) is 10 or more. fn1 = 10 (Nb + V) + 1.5W + 20N + 1500B-25Si ... (1) The content of the corresponding element is substituted in% by mass for Nb, V, W, N, B, and Si in the formula (1). To.