20#??????ù?-GB6479??????ù????(???????????ù???)
20#??????ù?:GB6479??????ù????
20#??????ù?:?????豸?????????GB6479-2000?????????????????-40~400?楨????????10~30Ma??????豸??????
20#?????
???????????????????
????1?????????????GB/T699-1999??
???????г????????C???????????????????????裨Si???????????0.40%???????Mn???????????0.80%???????1.20%?????????????????????????????????????
??????ù????:???????????-???????-?????????-??????????-???????????-????????????
??????ù??GB6479-86?????????????????-40~400?楨????????10~30Ma??????豸?????????????????????????
?????????豸?????????GB6479-2000?????????????????-40~400?楨????????10~30Ma??????豸??????????????????????????
??????????????????????????
??????б????GB6479-2000??ASTM DIN JIS
????????????20# 16Mn??15CrMo,12CrMo??12Cr2Mo??
?????????????????????????????????????????????????????????????????????????????????????????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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