In order to ensure better comprehensive mechanical properties of the nitriding workpiece, the heat treatment before nitriding is generally treated with quenching and tempering. The quenching heating temperature is too high and the quenching medium has a slow cooling ability, which causes the austenite grains to coarsen and the free iron body to appear in the core, which leads to the appearance of network nitrides in the infiltrated layer after nitriding and reduces the hardness of the core, directly affecting quenching and nitriding. effect. 38CrMoAl steel is quenched by NH fast bright quenching oil, and its surface hardness, hardened layer depth and surface hardness uniformity are better than ordinary oil quenching, and quenching deformation is small. Under the condition of ensuring tempering hardness, the workpiece quenched by NH fast bright quenching oil can increase the tempering temperature by more than 20 °C, and its microstructure is fine soxite, which increases the depth and hardness of the subsequent nitriding layer. See the table below for comparison. Table: Tempering temperature, hardness and quality of infiltrated N layer Waterproof Vinyl Flooring,Luxury Vinyl Flooring,Luxury Vinyl Decorative Flooring,Luxury Vinyl Pvc Flooring Yibin Tianyuan Group , https://www.ybtyco.com