Title: Cyanide-free carburizing process and composition

Abstract: A cyanide-free molten salt carburizing process and composition comprising an alkali metal salt bath having a cover of finely divided graphite particles in a size range of about 100 mesh to about 300 mesh. The bath is operated in the temperature range of about 1550.degree. F. to 1900.degree. F. and is provided with mechanical agitation to produce entrainment of air through the surface cover and sufficient mobility of carbon monoxide coated graphite particles to produce carbon diffusion by contact into the surface of the parts immersed in the bath. Total graphite content is between about 11/2% to about 7% of the active portion of the bath. The graphite is preferably of the synthetic type so as to produce an ash content below about 1%.

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Inventors: Foreman, Robert W. (Bloomfield Hills, MI, US)
Dubal, Gajen P. (Sterling Heights, MI, US)
Fox, Charles R. (Livonia, MI, US)

Application Number: 812758
Filing Date: 1977-07-05
Publication_date: 1979-05-08
Assignee: Park Chemical Company (Detroit, MI)
Primary Class(es): 148/227 148/27, 148/29
Other Classes:
US Patent Ref:

1796248	Mar, 1931	Freudenberg	148/15.
2568860	Sep, 1951	Leininger et al.	148/15.

Other Refs: 944665

Apr, 1974	CA.

Primary Examiner: Rutledge, L. Dewayne
Assistant Examiner: Shechan, John P.
Attorney: Krass & Young