Heat-resistant, ferritic cast steel having high castability and

Details Heat-resistant, ferritic cast steel having high castability and Heat-resistant, ferritic cast steel having high castability and

1994-11-17

1996-12-10

Sheehan, John

Metal treatment

Stock

Ferrous

420 67, 420 69, C22C 3818

Patent

active

055826571

ABSTRACT:
The heat-resistant, ferritic cast steel of a high castability has a composition consisting essentially, by weight, of C: 0.15-1.20%, C-Nb/8: 0.05-0.45%, Si: 2% or less, Mn: 2% or less, Cr: 16.0-25.0%, W and/or Mo: 1.0-5.0%, Nb: 0.40-6.0%, Ni: 0.1-2.0%, N: 0.01-0.15%, and Fe and inevitable impurities: balance. The cast steel has, in addition to a usual .alpha.-phase, an .alpha.'-phase transformed from a .gamma.-phase and composed of an .alpha.-phase and carbides. The area ratio (.alpha.'/(.alpha.+.alpha.')) of the .alpha.'-phase is 20-70%. The heat-resistant, ferritic cast steel of a high castability is suitable for exhaust equipment members such as exhaust manifolds, turbine housings, etc.

REFERENCES:
patent: 3649252 (1972-03-01), Kirkby et al.
patent: 5091147 (1992-02-01), Ohtsuka et al.
patent: 5106578 (1992-04-01), Ohtsuka et al.
patent: 5152850 (1992-10-01), Takahashi et al.
European Search Report dated Feb. 23, 1995.

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