Q345qC?????????????????????
5??1800??8000+ 32??
5??1800??8000+ 32??
8??1800??8000+ 90??
8??2000??8000+ 70??
10??1800??8000+ 70??
10??2000??8000+ 90??
????????? ???????
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?????????????MPa 345-305 ????????????bMPa 510-490???????5%??21??
Q345QC???????????Q345QC??????
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