| 摘要 |
PURPOSE:To provide an Ni-base high-Cr alloy having excellent resistance to corrosion, particularly to stress corrosion cracking with a 30%Cr-60% Ni alloy by specifying the conditions of the annealing to be performed according to content of C and adding Mo, W and V to the alloy. CONSTITUTION:This alloy has the compsn. consisting, by weight, of <=0.04% C, <=1.0% Si, <=1.0% Mn, <=0.030% P, <=0.02% S, 40-70% Ni, 25-35% Cr, 0.1- 0.5% Al, 0.05-1.0% Ti, 0.5-5.0% >=1 kind among Mo, W and V and the balance Fe and is subjected to an annealing treatment under the conditions in the region enclosed by A-E of the figure which are A (0%, 910 deg.C), B (0%, 850 deg.C), C (0.02%, 850 deg.C), D (0.04%, 900 deg.C) and E (0.04%, 1,000 deg.C). If the carbide in the grains is thus positively precipitated, the resistance to stress corrosion cracking is improved and further the synergistic effect is obtd. by addition of Mo, W and V which are known as the elements effective in improving the resistance to pitting corrosion.
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