黄色一级片久久,天堂8√,午夜激情啪啪,亚洲人久久,国产成视频在线观看,蜜桃一区二区,97在线免费观看视频

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。