亚洲中文字幕无码久久2020|国产国产久热这里只有精品|免费久久精品国产片|尤物yw午夜国产精品视频|国产精品一区二区三区白丝

軸套材料：

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

滲碳鋼(Carburizing steel): 20Cr ( 5120 )??20CrMo(4118)??20CrNiMo(8620H)

銅(Copper):ZCuZn24AI6Mn3Fe3??ZCuAI9Fe4Ni4Mn2

彈簧鋼(Spring steel):65Mn??50CrVA??60Si2MnA

產品特點：內孔有徑向潤滑槽