?????????ˉ???????-20#?????ˉ??????-GB3087?????ˉ?????
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20#??ˉ??219*20-22-25-28-30-35-40-45-50??????ˉ?????
20#??ˉ??232*20-22-25-28-30-35-40-45-50??????ˉ?????
20#??ˉ??245*20-22-25-28-30-35-40-45-50??????ˉ?????
20#??ˉ??273*20-22-25-28-30-35-40-45-50??????ˉ?????
20#??ˉ??299*20-22-25-28-30-35-40-45-50??????ˉ?????
GB3087?????ˉ?????:
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????????????????????????????240?????????????250?????????????450??????????????????76????35%??????159-650????25%??????????????????190?????54%??????76?????5.7%??????????????15?????4.3%??????????й?????????5?????1.4%??
?????????????????????????????????????????????????????????????????????????????????????????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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