国产欧美激情日韩成人三区|成A∨人片在线观看无码|91欧美精品午夜性色福利在线|亚洲一级黄色,男人的天堂久久久,久久综合操,国产超级乱淫视频播放免费

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.