日韩欧美在线视频免费,黄色国产91,欧美日韩亚洲国产,最近中文字幕在线,性高爱久久久久久久久,亚洲精品午夜不卡,一区二区三区福利视频

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.