1, ?????????? ?????? ??? ?? ???? ???? ????? ?????? ?????????? ?????? ??? ?????? ??????. ???????? ?? ?????? ??????? ?? ?? ???? ????, ?????? ???? ????.

2. ?????? ?????????? ?????? ????:

?? ??????? ?????????? 5A50 ????? ??????: 265MPa; 3A21 ?? ????? ??????: <167MPa;

????????? 2A11: 370MPa; 2A12: 390 ~ 420MPa ?? ????? ??????; 2A13: 315 ~ 345MPa ?? ????? ??????;

3. ??????? ???????? ???????????? ????? ??????: 80 ~ 100MPa;

4. ???????? ?????? ??? ??????????? ????? ??? ???? ???????? ???????? ?? ??? ????????? ???? ????? ??? ??? ???? ????? ??????????.