??????????????????????
50*2200*8000+ 32??
60*2200*7000+ 75??
50*4030*555+ 98??
70*2200*9500+ 32??
80*2200*8000+ 56??
??????????????????????
16MnR????????????????,?????????????????????????????ò?????????????????????????á????????????????????????????????????Mn????????????20G??412-540?????????????????450-655????????????19-21%????20G?????24%?
???????????????лл ?? ????? ????????????????????
????????32mm????????????????????????