| 摘要 |
PROBLEM TO BE SOLVED: To provide a means of producing invert alloy showing a sufficiently low thermal expansion coefficient even in a low temp. region from a room temp. to a liq. nitrogen temp. and furthermore having a high strength. SOLUTION: Invar alloy contg. <=0.10%, C, 0.35%, Si, <=1.0% Mn, 0.015% P, <=0.005% S, <=0.3% Cr, 35 to 37% Ni, 0 to 0.5% Mo, 0 to 0.05%V, 0.01 Al, 0 to 1.0% Mb, 0 to 0.005% B. <=0.005% N, and the valance Fe with inevitably impurities is subjected to rolling in which >=30% cumulative draft is secured at least in a temp. region except for a cold temp. regions less than the temp. T( deg.C) calculated by the formula of T( deg.C)=950+110×Nb(%)<1/2> +500×C(%).
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