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???·???           45#?????????????????? 42CrMo????????????? ???????????????45#??? ?????г???????????? ??19????-?и????????????? ???????????к??????? ??????????????????????? ??????????????????????? ?????????????3960???? 5???????????г???????? ????????????????????? ????????????????ó?????    ???????           ???????????&nbs 20189 ASTM A2 15412 ??????????λ?????-???? 14560 ??????????  14366 dn???????????&nb 13892 ??????????|???????? 13075 ????????????|??? 13057 ??202??????????? 12598 ???????108*6??? 12586 ???????????|??? 12046 ??????????|???????? 12031 ????θ????????????|?? 11933 ???????????????|??? 11833 108*6?????1??? 11753 ??377????????- 11005 ????????????????? 10907 219*8.5??????? 10624 DN508*40??????? 10411