国产一区二区三区视频在线观看_国产成人免费视频_国产三级毛片_国产乱伦91_欧美乱伦综合_无码黄一区_激情九久视频一区_岛国无码在线视频_黄色狠狠干_日韩禽交在线播放__高清无码抽插_一级特黄网_91九色视频在线_99re亚洲无码

A type of product that is commonly used in piston rod mechanical products. However, due to its different scope of use and working conditions, sometimes it requires processes such as electroplating, rolling, quenching, tempering, and nitriding. So does it all need to be tempered?
However, not all piston rods require tempering. The quenching and tempering treatment mainly depends on the manufacturing materials used. Because quenching and tempering are only a dual heat treatment process of quenching and high-temperature tempering, the products after quenching and tempering can obtain the following benefits:
1. It can increase the working strength of materials.
2. After quenching and tempering treatment, the piston rod can have good comprehensive mechanical properties.
3. Helps to seal small surface cracks, hinders the expansion of erosion, and enhances surface corrosion resistance.
4. After quenching and tempering treatment, the internal stress generated by quenching can be eliminated to achieve the expected mechanical properties.
If the quenched piston rod needs to be reheated during quenching and tempering treatment, it must be carried out at a specific temperature range (350 ℃~650 ℃). Otherwise, if the temperature is higher or lower than this, the internal stress generated by quenching cannot be eliminated and the expected mechanical properties cannot be achieved.