Low thermal expansion casting alloy having excellent machinabili

Details Low thermal expansion casting alloy having excellent machinabili Low thermal expansion casting alloy having excellent machinabili

1988-06-01

1990-02-27

Yee, Deborah

Alloys or metallic compositions

Ferrous

Over 10 percent nickel containing

148336, 420 94, C22C 3808

Patent

active

049044478

ABSTRACT:
A low thermal expansion casting alloy which is excellent in machinability, has a reduced thermal expansion coefficient and is suited for use in applications such as precision machine parts. According to a first aspect of the invention, the alloy comprises, in terms of weight percent, C from 0.4% to 0.8%, Ni from 30.0% to 40.0%, and Co from 2.0% to 8.0%, the Ni and Co contents being in the composition range given by the formula Ni+Co.times.0.75=32.0-40.0%, the balance being Si 1.0% or less, Mn 1.0% or less S 0.2% or less, P 0.2% or less, one or two or Mg and Ca 0.3% or less in total, unavoidable impurities and iron. According to a second aspect, the alloy of the first aspect is heated to a temperature between 600.degree. and 1000.degree. C. and then quenched. Accordingly to a third aspect, the alloy comprises by weight percent C from 0.6% to 1.4% and Ni from 32.0% to 40.0%, the C and Si contents being in the composition range given by the formula C+Si.times.0.5<1.6%, the balance being the same as in the case of the first aspect. According to a fourth aspect, the alloy of the third aspect is heated to a temperature between 600.degree. and 1000.degree. C. and then quenched.

REFERENCES:
Annual Book of ASTM Standards (1975) Part 2-Ferrous Castings; Ferroalloys American Society for Testing and Materials.
Physics and Application of Invar Alloys (1978), No. 3, Honda Memorial Series on Materials Science No. 3, Maruzen Company, Ltd.
Engineering Properties and Applications of the Ni-Resists and Ductile Ni-Resists.
Metals Handbook, (8th Edition) American Society for Metals.

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