亚洲欧美日韩精品-h片在线免费观看-日本一本在线-中文字幕精品久久-蜜桃视频黄色-奇米影视av-欧美岛国片-欧美精品播放-男男做的视频-影音先锋 日韩-欧美日韩午夜影院-欧美不卡视频一区发布-国产精品一二三在线-欧美日本乱大交xxxxx-国产精品bbbbxxxx

The rolling processing of precision piston rod, which is formed by rolling, forms a cold working hard layer on its rolling surface. This effectively reduces the elastic and plastic deformation of the contact surface of the grinding pair, and can delay the occurrence or expansion of fatigue cracks, thereby improving the surface's corrosion resistance.
The quenching and tempering of precision piston rods is the process of quenching and tempering the piston rods. After quenching and tempering, it can effectively improve the working strength of the material, facilitate the closure of small surface cracks, hinder the expansion of corrosion benefits, and thus improve the surface corrosion resistance of stainless steel piston rods. However, not all piston rods require tempering, so tempering measures should be verified based on actual conditions and materials.