成人免费a视频,李雅在线观看一区国产,五月婷婷狠狠,精品国产自在2o18,狼伊人,五月天丁香婷婷网,久久亚洲精品无码观看不卡

Casus Products>> Casus

  The QS20C-B produced by XINGTAI STEEL has the advantages of stable composition, highpurity of steel, small decarburization layer and less surface defects. It can be used to produce shaft rod, all kinds of mechanical parts, etc. A customer of XINGTAI STEEL uses this material to produce sleeve, which is used for passenger car. Instead, the product quality is stable and meets the use requirements.