Method for sulfurizing cast iron

Details Method for sulfurizing cast iron Method for sulfurizing cast iron

1979-05-22

1980-10-28

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 624, C23F 724

Patent

active

042305071

ABSTRACT:
Cast iron is pretreated in an aqueous solution of nitric acid and then immersed in molten sulfur until a sulfurized layer is formed on its surface. The sulfurized layer is very thick and stable and has excellent molten aluminum resistance. Its uniformity is further improved by a subsequent diffusion treatment at elevated temperatures.

REFERENCES:
patent: 3144359 (1964-08-01), Takahashi

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