Case-hardening method for carbon steel

Details Case-hardening method for carbon steel Case-hardening method for carbon steel

1975-02-11

1976-10-26

Kendall, Ralph S.

Coating processes

Coating by vapor, gas, or smoke

Carbon or carbide coating

427253, 427399, 428457, C23C 902

Patent

active

039885151

ABSTRACT:
A case-hardening method for forming a hardened layer on the surface of carbon steel of high toughness and hardness is provided which comprises forming a powdered mixture of titanium in an amount of 5 to 30% by weight of said mixture, chromium in an amount such that the weight ratio of chromium to titanium is within the range of 2 to 10, alumina and a catalyst, embedding carbon steel in said powder mixture, and then subjecting said mixture to a heat treatment to form a hardened layer mainly composed of titanium carbide. The method may also be carried out by coating the surface of carbon steel with alumina, preparing a powder mixture containing titanium in an amount of 5 to 30% by weight of said mixture chromium in an amount such that the weight ratio of chromium to titanium is within the range of 2 to 10, alumina and a catalyst, then embedding said alumina-coated carbon steel in said powder mixture, and then subjecting said mixture to a heat treatment to form a hardened layer mainly composed of titanium carbide.

REFERENCES:
patent: 2685545 (1954-08-01), Sindeband
patent: 2962399 (1960-11-01), Ruppert et al.
patent: 3579373 (1971-05-01), Pingel

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