| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-strength low-thermal-expansion alloy having adequate workability, high mechanical strength and a small coefficient of the thermal expansion, and to provide a precision instrument using the same. SOLUTION: The production method includes: preparing an alloy which includes 30-38% Ni, 1-7% Co, 1% or less respectively of and 0.0001-3% in total of fluorine compounds of group IIa elements of Mg, Ca, Sr and Ba, and the balance Fe; annealing the alloy at 900°C or higher but lower than the melting point; then cooling the annealed alloy; and subsequently subjecting the cooled alloy to wire drawing with a working rate of 60% or more to produce a bar or a wire having desired thickness, or further heating the bar or the wire at 70-500°C. The high-strength low-thermal-expansion alloy has the tensile strength of 1,000 MPa or more, and the coefficient of the thermal expansion of (-1 to +1)×10<SP>-6</SP>°C<SP>-1</SP>at -50 to 100°C. COPYRIGHT: (C)2011,JPO&INPIT
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