1952 Volume 16 Issue 8 Pages 443-446
The effect of the reaction on steel in carburizing atmospheres mingled with ammonia, the atmosphere being produced by the combustion with dry air, was studied under various conditions and the following results were obtained. (1) Steel can absorb simultaneously carbon and nitrogen from such atmospheres. (2) The amounts of carbon and nitrogen in the case of steel increase in accordance with ammonia content at low temperature. (3) Nitrogen concentration in the case decreases with the rise of operating temperature and carbon concentration readily surpasses 2% between 700° to 800°, even in such a weak carponizing atmosphere. (4) The amount of carbonitriding is not effected by the carbon content of steel at high ammonia concentration and low temperatures.
