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??????????ù????-?????????ù????-???GB6479????????

??????ù?:

??????ù??GB6479-2000??????????豸??????????????????????豸???????????????????????????20??16Mn??

  

12CrMo??12Cr2Mo???

??????????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??

?????????ù????:

127*18-20-22-28-30	245*14-16-18-20-22
133*4.5-5-6-7-8-10-12-14	245*25-28-30-32-35-38-40
133*16-18-20-22-25	273*7-8-9-10-12-14-16-18
140*4.5-5-6-7-8-10-12-14	273*20-22-25-28-30
140*16-18-20-22-25-28	273*32-35-40-50
146*4.5-5-6-8-10-12-14-16	299*10-12-14-16-18-20
146*18-20-22-25-30	299*22-25-28-30-35-40-45
152*4.5-5-6-8-10-12-14	325*8-9-10-12-14-16-18
152*16-18-20-22-28	325*20-22-25-28-30
159*5-6-8-10-12-14	325*32-35-40-45-50

???GB6479????????

??????ù?(GB6479-2000)

??????ù??????????????[(??-???)*???]*0.02466=kg/?????????????