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