????12??30?????????26*1800*8m??15mnvnq??????????????
??????????????????
????
?????????????MPa 345-305 ????????????bMPa 510-490???????5??21??
Q345QC???????????Q345QC??????
???????????????
??????????????????
6??1800??8000 80??
10??1800??8000 76??
8??1800??8000 90??
10??2000??8000 35??
12??2000??8000 42??
14??2000??8000 21??
???????????????????
???????????????????????????????г???????????????????????????????????????????????г?????λ???????????????彻???????????棬ó??????????????????????????
????12??30?????????26*1800*8m??15mnvnq??????????????????
