日韩欧美千人斩一区二区_成年女人免费视频永久vip_久久午夜无码鲁丝片秋霞_日韩 在线 中文_麻豆一区网址_亚洲人成激情电影_超碰中文字幕91_可以看女生隐私部位的软件_午夜精品aaa免费视频观看在线_飘雪影院在线观看免费版高清电影

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