???????????б??:
1?? ??????????GB8162-99
2?? ???????????????GB8163-99
3?? ??ˉ????????GB3087-1999
4?? ??ˉ?????????GB5310-95??ST45.8-?????
5?? ?????豸??????????GB6479-1999
6?? ???????????????YB235-70
7?? ??????????????YB528-65
8?? ??????????????GB9948-88
9?? ??????????????YB691-70
10??????????????????GB3088-1999
11??????????????GB5312-1999
12???????????????????GB3639-1999
13?????????16Mn??27SiMn??15CrMo??35CrMo??12CrMov??20G??40Cr??2Cr1MoV??15CrMo
27SiMn????
????27SiMn??????????б??GB/T17396-1998?????????????ú???????????????????????????????????????20??45??27SiMn???
27SiMn?????????????????????????????????????????????????????????????????????????????????????????辭????????????????????????????????????????????????????????????????????????????????????????????????е??????е????????. ????HB285??????????????????
27SiMn??????????
|
??? |
??????(????????)(%) |
|
C |
Si |
Mn |
Cr?? |
Mo |
Ni |
B |
V |
|
27SiMn |
0.24-0.32 |
1.10-1.40 |
1.10-1.40 |
?? |
?? |
?? |
?? |
?? |
27SiMn???????????
|
??? |
???????MPa |
??????MPa |
????????%?? |
???????????%?? |
|
27SiMn |
980 |
835 |
12 |
40 |
27SiMn?????????????
???? ??? ?? ?? ?????????磯mm ????? ??????? ??????????????????????HBSl00??3000?? ?? ?? ?? ?? ????????b??MPa ??????s??MPa ????????5(??) ???????????(??) ???????Aku2??J ??????????C ????? ?????????? ????? ????δ?? ????δ?? ?? SiMn 27SiMn 25 920 ? 450 ????? 980 835 12 40 39 217 ??????????25??920????450???? ????1000MPa,????850MPa??????12????????????40?? ak 490.3kJ/m2?? ???? Ac3 880 Ar3 750 ?????? J HRC36/16mm 10%??? 45????55mm ?????? 25????35 ?????????HBS10/3000 <=217
?????λ???
?? ? ? ?? 
