91精品欧美激情在线播放-91精品啪国产在线观看免费牛牛-91精品日本久久久久久牛牛-91精选视频在线观看-91九色蝌蚪在线-91九色在线视频

As we all know, precision piston rods are a widely used connecting component that can be applied to almost all mechanical products. Its commonly used materials mainly include steel grades 45, 40Cr, 2Cr13, and other steels, which require specific treatment processes such as electroplating and heat treatment to obtain specific properties and meet certain needs. Therefore, it must undergo heat treatment to obtain good strength, surface hardness, corrosion resistance, friction resistance, and bite resistance. The material heat treatment methods for precision piston rods include:
1. 45 # steel
Heat treatment process: preparation heat treatment - low-temperature spheroidizing annealing - quenching - critical temperature quenching - high-frequency quenching
2. 40Cr
Heat treatment process: preparation heat treatment - elimination of internal stress in the workpiece - quenching and tempering operations - workpiece quality inspection
3. 2Cr13
Heat treatment process: preparation heat treatment process - quenching and tempering treatment - stress relief treatment - high-frequency quenching, low-temperature tempering