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 SCM415 produced by XINGTAI STEEL has stable composition, low harmful elements, small decarburization layer, few surface defects, excellent mechanical properties and machining properties, It is widely used in fields such as construction, machinery, and automobiles. A customer of XINGTAI STEEL used this steel grade to produce automotive chassis connecting rods. The customer reported that the surface quality of the product is stable, with few pits and spots, which met product usage requirements.