C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/152, 148/48
C22C 38/10 (2006.01) C21D 6/02 (2006.01)
Patent
CA 1325902
Abstract of the Disclosure 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 x 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 and 1000°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 x 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 and 1000°C and then quenched.
567495
Macrae & Co.
Nippon Chuzo Kabushiki Kaisha
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