?????????????
???????????????????????????壬????????????????????????????????????β????q????????
????????????????????í??????????A3q?????????????????16q????????????????12Mnq??12MnVq??15MnVNq??16Mnq??????????????4.5~50?????
???????????
?????????????
8??2000??8000 35??
8??2000??8000 42??
8??2000??8000 21??
8??2000??8000 32??
12??2000??8000 79??
??????????40*1.8*7??q345qc????????????????????
