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Last heat treatment manner and Ni basic alloy null mass of the Ni basic alloy which is superior in resistance
Last heat treatment manner and Ni basic alloy null mass of the Ni basic alloy which is superior in resistance
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机译:电阻优异的Ni基础合金的最终热处理方式和Ni基础合金零质量
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摘要
PROBLEM TO BE SOLVED: To provide a method for finally heat-treating a Ni-based alloy, in which the amount of carbon to be contained in a 690 series Ni-based alloy and final heat treatment conditions of the alloy are optimized to produce the 690 series Ni-based alloy having the PWSCC (primary water stress corrosion cracking) resistance improved much more than that of the alloy which underwent TT treatment while eliminating TT treatment.;SOLUTION: Such the final heat treatment is applied to the Ni-based alloy, which contains, by mass, 0.02-0.04% C, ≤0.5% Si, ≤0.5% Mn, ≤0.03% P, ≤0.015% S, 27-31% Cr, 7-11% Fe, ≤0.5% Cu, ≥58% Ni and the balance of impurities, that the Ni-based alloy is heated for 1.5-60 minutes at the temperature which is decided according to the carbon amount and is ≤1,150°C but is not less than the temperature when the Ni-based alloy becomes a complete solid solution and the heated Ni-based alloy is air-cooled at 500-150°C/minute cooling rate.;COPYRIGHT: (C)2011,JPO&INPIT
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