??????ˉ??#???????????ˉ????????*20#?????ˉ??????????
??????ˉ??#???????????ˉ????????:
???????ˉ????:GB3087-2008
?????ˉ????????????????????????????????????????????????ɡ????????????????о?????????λ????
?????????????????????????ˉ??????????240?????????????250?????????????450??????????????????76????
?????ˉ??
35%??????159-650????25%??????????????????190?????54%??????76?????5.7%??????????????15?????4.3%??????????й?????????5?????1.4%??
?????????ˉ????б????GB3087-1999???????ˉ????????
?????????ˉ??????????????????????ˉ???????????????????????ˉ?ù????????????????С?????????????????????????????Σ?????????????????????ˉ???????ˉ?????????????????????????10??20????
20#?????ˉ??????????:
20#?????219*6-8-10-12-14-16-18-20-22-25-28-30-35-40-45-50
20#?????245*6-8-10-12-14-16-18-20-22-25-28-30-35-40-45-50
20#?????273*6-8-10-12-14-16-18-20-22-25-28-30-35-40-45-50
20#?????299*10-12-14-16-18-20-22-25-28-30-35-40-45-50-55-60
20#?????325*10-12-14-16-18-20-22-25-28-30-35-40-45-50-55-60
20#?????351*10-12-14-16-18-20-22-25-28-30-35-40-45-50-55-60
20#?????356*10-12-14-16-18-20-22-25-28-30-35-40-45-50-55-60
20#?????377*10-12-14-16-18-20-22-25-28-30-35-40-45-50-55-60
?????????????????????????????????????????????????????????????????????????????????????????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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