Q345qE????顢????????????????????

Q345qE???
????Q345qE?????????????????????·??·???????塣????н????????????????????????????
????Q345qE?????????????????????????????????????????????????????????????????????????????????????????? ??????
??????????% ??1
????C Si Mn P S Als
????Q345qE ??0.17 ??0.50 1.2??1.6 0.020 0.015 ??0.015
??????1?е?????????Als???????ò???????????棬????????????С??0.02%??
???????????????????????????????????????????2??涨???????????????????????
??????2 %
????V Nb Ti N
??????0.08 ??0.045 ??0.02 ??0.018
????????????????????????????????0.30%??
??????????????????????????3??涨??
??????3
??????? Q345q Q370q Q420q C??q 0.43 0.44 0.45
??????????????й?????? C??q??%??=C+??n/6+Si/24+Ni/40+Cr/5+??o/4+V/14
???????????
??????4
??????? ??? ???mm ?????? ??????? ???? V?????? V???Ч??? 180C????????
???????MPa ??bMPa ??5% ?????? (????)J ?????mm
???????C J ??16 >16
??????С?? ??С?? ??С?? ??С?? ??С??
????Q345qC ??16 345 510 21 0 0 0 d=2a d=3a
????Q345qC >16??35 325 490 20 0 0 0 d=2a d=3a
????Q345qC >35??50 315 470 20 0 0 0 d=2a d=3a
????Q345qC >50??100 305 470 20 0 0 0 d=2a d=3a