如意直播app下载安装材料：

直淬钢(Dierct harden steel): GCrlS ( 52100) 42CrMo (4140 ) 45(1045)

渗碳钢(Carburizing steel): 20Cr ( 5120 ) 20CrMo(4118) 20CrNiMo(8620H)

铜(Copper):ZCuZn24AI6Mn3Fe3 ZCuAI9Fe4Ni4Mn2

弹簧钢(Spring steel):65Mn 50CrVA 60Si2MnA

产品特点：外圆有两条蕾丝视频槽