Abstract
When the chromium steel is heated in the atmosphere, containing the appreciable amount of oxidizing gas such as moisture and carbon dioxide, it is oxidized and discolored due to the low dissociation pressure of the chromium oxides. We studied, in this experiments, the effects of gas constituents in the atmosphere and heating temperature, the chromium content in steel to the surface brightness and the nitriding effect of steel.As the results of this experiments, low chromium steel is heated without surface discoloration and decarburization in the atmosphere of hydrogen, hydrogen and nitrogen or (hydrogen, nitrogen and carbon monoxide) gas which have low moiature content.The heat-treatment of high chromium steel becomes comparatively easy as the heating temperature get higher. The nitrogen content of the steel tends to increase as the partial pressure of nitrogen increases, and decrease as the chromium content of the specimen increases.
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