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

20MnB4 produced by XINGTAI STEEL is mainly used to manufacture 8.8-10.9 high strength fasteners, designed for the high-end user.few factory can produce it . One of our customers use this product to produce  the well-known brand passenger   car chassis bolt.customer feedback this product have good performance in chemical component cold heading metallographic structure hardenability and decarburization .This spec with stable quality can meet the customer requirement.