| 摘要 |
PROBLEM TO BE SOLVED: To produce an Fe-Ni base invar alloy improved in weld high temp. cracking resistance without checking its physical properties (low terminal expansibility) and mechanical properties even without adding Ta, Hf, Mo and W thereto. SOLUTION: This Fe-Ni base invar alloy excellent in weld high temp. cracking resistance contains, by weight, 30 to 45% Ni, <=0.08% Si, <=0.003% S, <=0.007% P, <=0.004% O, <=0.07% Sn, 0.006 to 0.03% Al and <=0.003% N so as to satisfy (S%+0.5×P%+O%+0.2×Sn%):<=0.02%.
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