Superalloys with low thermal-expansion coefficient

Details Superalloys with low thermal-expansion coefficient Superalloys with low thermal-expansion coefficient

1992-03-02

1993-03-09

Yee, Deborah

Alloys or metallic compositions

Containing over 50 per cent metal but no base metal

Iron containing

420 95, C22C 3808, C22C 3000

Patent

active

051924978

ABSTRACT:
A superalloy with a low thermal expansion coefficient has of 0.1% or less of C, 1.0% of less or Si, 1.0% or less of Mn, 0.5 to 2.5% of Ti, more than 3.0% and not more than 6.0% of Nb, 0.01% or less of B, 20 to 32% of Ni and more than 16% and not more than 30% of Co within a range of 48.8.ltoreq.1.235xNi+Co<55.8, and the balance essentially Fe except for incidental impurities. The superalloy may further contain 1.0% or less of Al, and has a mean coefficient of thermal expansion of 7.0.times.10.sup.-6 /.degree. C. or less from room temperatures to 400.degree. C., a tensile strength of 100 kgf/mm.sup.2 or more at 500.degree. C., and a notch rupture strength superior to a smooth rupture strength in a creep rupture test at 500.degree. C.

REFERENCES:
patent: 4200459 (1980-04-01), Smith et al.

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