Low thermal expansion cast alloy

Details Low thermal expansion cast alloy Low thermal expansion cast alloy

1988-02-19

1989-05-23

Yee, Deborah

Alloys or metallic compositions

Ferrous

Over 10 percent nickel containing

420 94, C22C 3808

Patent

active

048329088

ABSTRACT:
A novel low thermal expansion cast alloy is provided. The alloy consists of, by percents by weight, 0.02 to 0.25% of C, 30.5 to 33.3% of Ni, 4.0 to 6.0% of Co, 0.005 to 0.70% of Mn, 0.005-0.50% of Si and the balance substantially of Fe, with the proviso that % C.gtoreq.3.0285-0.0936 x % Ni (% C and % Ni are weight % of C and Ni). By such composition, micro-segregation of Ni can be reduced and the Ni content range showing the low thermal expansion coefficient can be broadened to an extent of substantially enabling mass production by a casting process in place of the conventional forging or rolling process. The average thermal expansion coefficient at the temperature range from - 50 to 120.degree. C. of the cast alloy is not more than 1.5.times.10.sup.-6 /.degree.C.

REFERENCES:
patent: 1942261 (1934-01-01), Scott
Expansion Properties of Low-Expansion Fe-Ni-Co Alloys, Trans. AIME 193 Institute of Metals Div., vol. 89 pp. 508-537.

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