20???п???? ??219mm???п????? ????????????? 
20???п????? 
?????п????????6????????????????п???????????????????????????????????п2????????п????????????????????????????????????п???????????????0510-88268136 
??219mm???п?????? 
219mm??п????????6????????????????棬??????????5.1?/?????ο???????????????QQ??709154628 
?????????????? 
????????????????GB/T8163-2008????????????????????????????????????  
??????????????????[(??-???)*???]*0.02466=kg/????????????? 
??б?? 
?й??????? GB/T8163 
??? 
????????????????????塣 
????????????? 
10#??20#??Q345 
                       
                       
                      ?????????????????????????????????????????????????????????????????????????????????????????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 
                   |