规格齐全材质16MnCr5产地/厂家进口/国产供应16MnCr5BF齿轮钢,16MnCr5BF,德标16MnCr5BF合金钢，进口轴承钢：美国轴承钢:E5110051100E5210052100日本轴承钢:SUJ1SUJ3SUJ2进口不锈轴承钢:SUS440CSUS440B)