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 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.