????Q420q???????????
Q420q??????????????????
5??1800??8000+ 32??
5??1800??8000+ 32??
8??1800??8000+ 90??
8??2000??8000+ 70??
10??1800??8000+ 70??
10??2000??8000+ 90??
??????????????
???????????????????????????????壬????????????????????????????????????β????q????????
????????????????????í??????????A3q?????????????????16q????????????????12Mnq??12MnVq??15MnVNq??16Mnq??????????????4.5~50?????
???????? ???????лл ?? ????? ?????Q420q???????????
?????????Q420q?????????????????