Carburization of ferrous alloys

Details Carburization of ferrous alloys Carburization of ferrous alloys

1978-12-01

1980-05-13

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 131, C21D 148

Patent

active

042027101

ABSTRACT:
A method for carburizing low alloy steel having carbon content of no more than 0.5% employing two-step carburizing process. The method comprising pre-carburizing the steel in a carburizing atmosphere having a carbon potential of less than Acm to produce a carburized case having hypereutectoid composition, cooling the steel to transform the case into a bainite, pearlite or martensite structure, and carburizing the steel by heating thereof to a carburizing temperature for a sufficiently long time to produce carbides in a spheroidal or spherical form, the carburizing being carried out in such a manner that the heating speed of the steel is being controlled under 20.degree. C. per minute in a region between Ac.sub.1 temperature and 750.degree. C.-950.degree. C. and the carbon potential in the carburizing atmosphere is being maintained over Acm when the temperature is over Ac.sub.1.

REFERENCES:
patent: 3669652 (1972-06-01), Young et al.
patent: 4038109 (1977-07-01), Pflieger et al.

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