Heat-resistant, ferritic cast steel and exhaust equipment member

Details Heat-resistant, ferritic cast steel and exhaust equipment member Heat-resistant, ferritic cast steel and exhaust equipment member

1991-03-26

1992-10-06

Yee, Deborah

Metal treatment

Stock

Ferrous

420 69, C22C 3822, C22C 3824

Patent

active

051528509

ABSTRACT:
The heat-resistant, ferritic cast steel has a composition consisting essentially, by weight, of C: 0.05-0.45%, Si: 0.4-2.0%, Mn: 0.3-1.0%, Cr: 16.0-25.0%, W: 1.0-5.0%, Nb and/or V: 0.01-1.0% (each 0.5% or less), and Fe and inevitable impurities: balance, the cast steel having, in addition to a usual .alpha.-phase, an .alpha.'-phase transformed from a .gamma.-phase and composed of an .alpha.-phase and carbides, an area ratio (.alpha.'/(.alpha.+.alpha.') being 20-90%. The cast steel is subjected to an annealing treatment at a temperature lower than a (.gamma.+.alpha.) phase region. The heat-resistant, ferritic cast steel is suitable for exhaust equipment members such as exhaust manifolds, turbine housings, etc.

REFERENCES:
patent: 2880085 (1892-03-01), Kirkby et al.
patent: 3700432 (1972-10-01), Brickner
patent: 4799972 (1989-01-01), Masuyama et al.

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