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GB5310?????ˉ????-?????????ˉ????:
GB5310?????ˉ????-?????????ˉ????-?????????????????????????20G?????ˉ??-GB5310?????ˉ??-??????????ˉ??-???????????ˉ??-????????ˉ??-?????????ˉ???
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20G?????ˉ????????6-630*1-100mm???????,????????????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??...
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