Co-Ni-base alloy

Abstract

A Co-Ni-base alloy, being characterized in that a composition of the alloy comprises at least Co, Ni, Cr, Mo, W and Fe, and percentages by weight of the composition are from 25% to 45% of Co, from 25% to 40% of Ni, from 18% to 26% of Cr, from 3% to 11% of Mo, from 0.5% to 9% of W, wherein a sum of Mo and W is from 4% to 13% by weight, and from 1.1% to 5% of Fe.

Description

technical field [0001] The present invention relates to a kind of Co-Ni base alloy, especially a kind of Co-Ni base alloy with high elasticity and high corrosion resistance used in small precision instruments etc. spring, and a method of making the spring. Background technique [0002] So far, Co-based alloys, and Co-Ni-based alloys that are more effective than Co-based alloys and the like have been used as highly elastic materials in small precision instruments (for example, see Patent Document 1). [0003] Moreover, since the spring of a watch requires high output torque, strong durability, and corrosion resistance, Co-based alloys or Co-Ni-based alloys have high Young's modulus or material strength, excellent It is used as a spring material due to its corrosion resistance and good plastic workability. In many cases, Co-based alloys commonly used in watch springs have a Young's modulus of about 2.0×10 5 MPa - about 2.1×10 5 MPa. As a method of manufacturing a watch sp...

AI Technical Summary

Problems solved by technology

[0007] With the improvement of the performance of mechanical watches and the diversification of its additional devices, the mainspring as an energy source is required to have a higher output torque, and this presents a problem: the traditional mainspring is no longer adequate for this requirement.

However, the space inside the mechanical watch is limited, so it is not appropriate to increase the thickness or width of the mainspring

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