??????????ˉ??**20#???????ˉ?????**GB3087?????ˉ????
??????????ˉ??:
?????ˉ????????????????????????????????????????????????ɡ????????????????о?????????λ????
?????????????????????????ˉ??????????240?????????????250?????????????450??????????????????76????
?????ˉ??
35%??????159-650????25%??????????????????190?????54%??????76?????5.7%??????????????15?????4.3%??????????й?????????5?????1.4%?? ?????????ˉ??????????????????????ˉ???????????????????????ˉ?ù????????????????С?????????????????????????????Σ?????????????????????ˉ???????ˉ?????????????????????????10??20????
20#???????ˉ?????**GB3087?????ˉ????:
20#?????ˉ???????????:6-560mm???1-80mm,???????,?????:18921511196
?????ˉ????б????GB3087-1999???????ˉ????????
?????????????????????????????????????????????????????????????????????????????????????????С???????????????????????????????????????????????????????????,??????????????20#??45#??16MN??Q345??A/B/C/D/E????27SIMN??15CrMO??12Cr1MOV??10CrMO910??304??304L??316??316L??321??P11??P22??P91??T91.??й???GB8162-99?????GB8163-99????????????ù?????????GB3087-99??GB5310-85????????ˉ?ù??GB5312-8???ù??...
???????????0510-88264321??88223334 ???棺0510-88223334 ?????18921237777
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