欧洲精品乱码久久久久蜜桃,72式性无遮挡在线观看视频,夜夜操夜夜干,一区二区三区在线免费观看,色91av,欧美激情片一区二区,91cn国产在线

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