黄色一级片久久,天堂8√,午夜激情啪啪,亚洲人久久,国产成视频在线观看,蜜桃一区二区,97在线免费观看视频

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.