????Q345qD?????????????????????????????????????????г??????????????????????????????;????????????????
?г????????????????г??????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????????
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10??2000??8000+ 70??
10??2000??8000+ 76??
10??2000??8000+ 70??
4??1500??8000+ 21??
10??2000??8000+ 70??
4??1500??800035??
4??1500??8000+ 80??
8??1800??8000+ 70??
6??1800??8000+ 80??
Q345qD??????????????????
????
?????????????MPa 345-305 ????????????bMPa 510-490???????5%??21??
Q345QC???????????Q345QC??????
??????
??????????????????????????????????????е?????????????
???????? ???????лл ?? ????? ?????Q345qD???????????
??????·??60mm???Q345qD????????????????