不卡视频一区二区三区,婷婷成人av,国产精品一区视频,久久夜色精品国产噜噜av小说,国产精品性夜天天视频,亚洲日产永久经典,九九国产精品入口麻豆

Main Products
Products Grade: QGCr15
Specifications: φ5.5~26mm
Applied Standard:  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 steelBearing steel
Use of Products: Use of Products: Because of better raw material and exercise strict control, QGCr15 is better than GCr15 of GB/T18254 on non-inclusion、Carbide homogeneity、decarburization and surface quality. It has good comprehensive properties.