色戒时长完整版,亚洲国产一区二区三区精品,久久久久久久精彩视频,怡红院av亚洲一区二区三区h,艳情五月,国产亚洲成av人在线观看导航,男女午夜免费视频

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。