GB3639-2008????????????//20#???????????**??????????????
GB3639-2008????????????:
????????????????????????????GB3639-2008?????????,??10-219mm???1-25mm,???????????????,??????????:20#\45#\16Mn??,??????????????????????
20#???????????:
20#????????????????0510-88268136
??λ????????????????GB3639-2008?????????е???????豸???羫??????????????λ???????????????
?????????????????????????????????????????????????????????????????????????????????????????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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