日本中出在线观看,日韩亚洲精品视频,欧美成人三级精品,一区二三区视频电影,日本伊人色综合网,三级全黄的视频在线观看,三级全黄的视频在线观看

Casus Products>> Casus

  The GML40Cr produced by XINGTAI STEEL is mainly used in the production of high-strength fasteners above 10.9 levels. The product has stable chemical composition, high surface quality and small decarburization layer. An automobile main engine factory uses the material to produce outer hexagon bolts for passenger cars. reflecting the product has good hardenability, stable performance and low cracking rate in cold heading.