HIGH-HARDNESS CONSTANT-MODULUS ALLOY INSENSITIVE TO MAGNETISM, PROCESS FOR PRODUCING SAME, BALANCE SPRING, MECHANICAL DRIVING DEVICE, AND WATCH

WIPO Patent Application WO/2010/055943

A9

A high-hardness constant-modulus alloy insensitive to magnetism which has a {110}<111> texture, a saturation magnetic flux density of 2,500-3,500 G, a temperature coefficient of Young's modulus at 0-40ºC of (-5 to +5)×10-5 ºC-1, and a Vickers hardness of 350-550; a balance spring comprising the alloy; a mechanical driving device; and a watch. An alloy comprising, in terms of atomic amount proportion, 20-40% cobalt, 7-22% nickel, 5-13% chromium, 1-6% molybdenum, and at least 37% iron as the remainder, provided that the sum of cobalt and nickel is 42.0-49.5% and the sum of chromium and molybdenum is 13.5-16%, is heated at a temperature not lower than 1,100ºC and lower than the melting point thereof and then cooled. Thereafter, the alloy is repeatedly subjected to wiredrawing and an 800-950ºC intermediate heat treatment. The alloy is thereby wiredrawn to a reduction ratio of 90% or higher to obtain a wire of a fibrous structure having a fiber axis <111>. The wire is then subjected to cold working at a draft of 20% or higher to form a sheet. Subsequently, the sheet is heated at 580-700ºC.

MURAKAMI YUETSU (JP)
JUJO KOICHIRO (JP)
TAKAHASHI OSAMU (JP)
TSUNEYOSHI JUN (JP)
SUGAWARA RYO (JP)
TAKANO TAKESHI (JP)

PCT/JP2009/069458

September 23, 2010

November 16, 2009

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FOUNDATION THE RES INST FOR EL (JP)
SEIKO INSTR INC (JP)
MURAKAMI YUETSU (JP)
JUJO KOICHIRO (JP)
TAKAHASHI OSAMU (JP)
TSUNEYOSHI JUN (JP)
SUGAWARA RYO (JP)
TAKANO TAKESHI (JP)

C22C30/00; C21D8/12; C22C38/00; C22F1/10; G04B17/06; C22F1/00

MURAI, TAKUO (JP)
Takuo Murai (JP)

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