Metal treatment – Compositions – Heat treating
Patent
1982-04-02
1983-08-23
Sheehan, John P.
Metal treatment
Compositions
Heat treating
148 611, 148 28, 427399, 427431, 252 71, C21D 148
Patent
active
044002246
ABSTRACT:
A method for forming a carbide layer on the surface of a carbon-containing ferrous alloy article or a cemented carbide article in a molten treating bath. The bath is prepared by introducing 5 to 20% by weight of alumina into molten boric acid or borate bath and a carbide-forming element dissolved therein. By employing the treating bath of this invention, the life of the bath can be remarkably improved, and no sintered substance of undissolved carbide-forming element is produced in the treating bath. Further, it is possible to reduce markedly the corrosion of the article and of the vessel holding the bath.
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Arai Tohru
Fujita Hironori
Takada Yasuo
Kabushiki Kaisha Toyota Chuo Kenkyusho
Sheehan John P.
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