???????????????
???????????????????????????壬????????????????????????????????????β????q????????
????????????????????í??????????A3q?????????????????16q????????????????12Mnq??12MnVq??15MnVNq??16Mnq??????????????4.5~50?????
?????????????
???????????????
14??2000??8000 35??
14??2000??8000 70??
8??2000??8000 21??
8??2000??8000 70??
8??2000??8000 32??
8??2000??8000 70??
10??2000??8000 21??
???11??19?????273*7??q550qd?????????????????
