国产午夜一级,欧美三级午夜理伦三级在线观看,国产精品另类激情久久久免费,一级毛片免费高清,99精品黄色,日韩超级大片免费看国产国产播放器,亚洲精品日韩一区二区电影

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.