Sumitomo Metal Industries, Inc.

Sanyo Special Alloys, Ltd.

Kanto Special Steel Works, Ltd.

Masaki Takashima

Kazuyuki Nakasuji

Mitsuru Aiba

A plated nickel-titanium alloy product having a plated layer of nickel or a nickel alloy containing 5 to 15% by weight of cobalt. This product exhibits excellent surface treatability and workability, as well as shape memory effect and super-elasticity. Thus the product is most suitable for eyeglass frame components or similar ornamental articles. The product is produced by plating a layer of nickel or a nickel-cobalt alloy on the nickel-titanium alloy, dehydrogenating, cold working with not less than 10% working ratio, and subjecting to a final heat treatment between 300.degree. C. and 900.degree. C. If the final heat treatment is conducted between 750.degree. C. and 900.degree. C. for 10 to 120 seconds, a product with 4% or more super-elasticity at room temperature can be obtained.

Plated nickel-titanium alloy product

A Ni free ferrous nonmagnetic alloy having excellent corrosion resistance and workability and high cost performance is described. The alloy comprises, by weight, 9 to 25% Cr, 3 to 35% Mn, 3 to 40% Co and the balance Fe and incidental impurities, and sum of Mn and 0.6Co is in accordance with a general relationship as indicated by formula 1/ , and preferably a restricted relationship as indicated by formula 2/ .

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Urawa, Japan

Masaki Takashima