久久久久国产综合av天堂,亚洲国产激情一区二区三区,国内精品人妻久久久久久,精品国精品国自产在国产

Heat resistant steel is a kind of steel with good high temperature resistance. Its products are generally used at high temperature. This kind of steel also needs nitriding treatment before use, so as to improve its hardness and wear resistance. But how to implement nitriding treatment of heat resistant steel? Whether there are professionals who can teach the operation skills.

For the nitriding treatment of heat-resistant steel, the key is to remove the passive film, which is the main factor affecting the nitriding process. Therefore, before nitriding, the heat-resistant steel should be sandblasted with fine sand at a pressure of 0.15-0.25mpa until the surface of the workpiece is dark gray.

In addition, the heat-resistant steel workpieces must be phosphated before nitriding. The purpose of this is to destroy the oxide film on the metal surface, which helps to form a porous and loose phosphating layer. In this way, the penetration of nitrogen atoms will be much easier. After a series of treatment, the workpiece can be coated with chloride bubble, so the effect will be significantly improved.