av永久免费观看,日韩在线精品视频,在线观看国产视频,国产精品久久片,国产毛片av网站,国产又粗又硬又黄又刺激,国产黄色片视频

Casus Products>> Casus

  The 16MnCr5 produced by XINGTAI STEEL is a kind of case hardening steel.which can obtain hard and wear-resistant surface structure and good plastic and toughness core structure through appropriate production process. A customer uses our 16MnCr5 to produce engine valve tappet, who reflects that our product has good dimensional accuracy, stable composition, and low cracking rate during cold heading.