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27SiMn?????????
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20??45??27SiMn???
27siMn?????????????????????????????????????????????????????????????????????????????????????????辭????????????????????????????????????????????????????????????????????????????????????????????????е??????е????????. ????HB285?????????????????? 27siMn???????????????????? ???? ??? ????????? ?? ?? ??????(????????)(??) C Si Mn Cr Mo Ni B V ???? siMn 8 A1O272 27siMn O??24??O??32 1.10??1.40 1.10??1.40 ???? ??? ?? ?? ?????????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
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