Abstract
1. Molten NaCl and KCl used to heat steel articles to quenching temperatures are oxidized and decarburized. The KCl salt has a lower viscosity and washes the oxides off the surface, while NaCl favors the accumulation of oxides on the surface. 2. Preliminary oxidation of steels leads to an increase of decarburization during heating in salts as compared to that resulting from heating of undeoxidized surfaces. 3. Activated BAU birch charcoal is the best deoxidizing agent as compared to graphite, borax, and ferrosilicon from the viewpoints both of its time of action and its deoxidizing capacity. 4. Molten KCl salt deoxidized with 1% activated birch charcoal does not induce decarburization or oxidation during heat treatment of structural steels. 5. After tempering of articles quenched in baths deoxidized with BAU charcoal in a chamber furnace at temperatures up to 500°C and in alkali and sodium nitrate up to 650°C, the surface of the articles does not require sandblasting.
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