| 摘要 |
<p>Method uses a carrier gas of mainly nitrogen in a heat treating furnace heated to 550-620 degrees C. The atmosphere of the heat treating furnace is a mixt. by vol. of ammonia (NH3) 10-30% and either CO 2.5-4.5% and the balance N2 or CO 1-3% and the balance endothermic treated furnace gas. The soft nitriding method provides fatigue strength and wear resistance to a ferrous member to form a crystal structure with the Epsilon-phase of the Fe-N-C system in the surface layer. In the conventional method using a large amount of NH3, amount of CO influences the mechanical properties of the ferrous member. This invention provides a atmosphere which economises in the use of ammonia.</p> |
