??·????????????????????????
????
?????????????MPa 345-305 ????????????bMPa 510-490???????5??21??
Q345QC???????????Q345QC??????
?????·?????????????????
??·????????????????????????
6??1800??8000 35??
6??1800??8000 80??
6??1800??8000 21??
6??1800??8000 80??
6??1800??8000 65??
8??1800??8000 35??
????????
??????????????????????????????????????????????????????α????????????????????????????????????????????????λ??
4??19?????18*1600*C???·????????????????????????????
