HIGH STRENGTH, LOW THERMAL EXPANSION ALLOY HAVING IMPROVED TWISTING PROPERTIES AND WIRE OF SAID ALLOY

摘要

A high strength low thermal expansion alloy which can maintain high tensile strength, excellent twisting properties and low thermal expansion very stably, and a high strength low thermal expansion alloy wire manufactured using the high strength low thermal expansion alloy are provided. A high strength low thermal expansion alloy having improved twisting properties comprises, by mass percent, 0.1 to 0.4% of C, 0.33 to 2.0% of Si, 2.0% or less of Mn, 3.0% or less of Cr, exceeding 0.5% to 3.0% of V, 25 to 40% of Ni, and the balance of Fe and inevitable impurities, wherein V, C and Cr satisfy the relational expressions 2=V/C=9 and 0.9=V/Cr. The high strength low thermal expansion alloy further comprises 3.02% or less of Co, and Ni and Co satisfy the relational expression 37%=Ni+Co=40%. The high strength low thermal expansion alloy further comprises 0.05% or less of B or/and 0.05% or less of Ca. The high strength low thermal expansion alloy further comprises: 0.05% or less of B or/and 0.05% or less of Ca; and 1.20% or less of one or more of Al, Mo, Ti, Nb, Zr, Hf, W, and Cu.