???????????????
???????????????????????????壬????????????????????????????????????β????q????????
????????????????????í??????????A3q?????????????????16q????????????????12Mnq??12MnVq??15MnVNq??16Mnq??????????????4.5~50?????
?????????????
???????????????
8??2000??8000 42??
8??2000??8000 21??
10??1800??8000 32??
10??1800??8000 80??
10??2000??8000 21??
10??2000??8000 52??
??????????????57??q620qe??????????????????
