免费在线看黄网址|av不卡免费看|日韩一二三四五区|国产日韩在线不卡,亚洲午夜激情网,国产自一区,啊啊啊国产

Main Products
Products Grade: GCr15Z
Specifications: φ5.5~26mm
Applied Standard:  agreement
Characteristics: The product is used to produce balls and rings of bearing,which need long life and high reliability.
Applications: Auto Bearing steelRailway bearing steel
Use of Products: GCr15-L is better than GCr15 of GB/T18254 on chemical、non-inclusion、Carbide homogeneity、decarburization and surface quality。