????Q420q???????????
??????????????????????????????г??????????????????????????????;????????????????
?г????????????????г??????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????????
??????????????????????
Q420q??????????????????
14??2000??8000+ 70??
8??2000??8000+ 21??
8??2000??8000+ 70??
8??2000??8000+ 32??
8??2000??8000+ 70??
10??2000??8000+ 21??
10??2000??8000+ 70??
Q420q??????????????????
???????????????????????????????壬????????????????????????????????????β????q????????
????????????????????í??????????A3q?????????????????16q????????????????12Mnq??12MnVq??15MnVNq??16Mnq??????????????4.5~50?????
???????????????лл . ?? ????? ????:Q420q???????????
?????????12mm???Q420q??????????????