国产一级精品成人久久av无码免费,日韩在线看片中文字幕不卡,中文字幕在线激情日韩一区,日韩欧美成人免费中文字幕,国产精品一区二区免费看,日韩欧美一区二区三区在线视频,中文字幕在线免费视频,中文字幕精品视频在线观看,国产日韩不卡免费精品视频,日韩中文字幕电影在线观看,91精品乱码一区二区三区熟女精品,亚洲欧洲在线观看精品,日韩中文字幕福利电影

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.