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???·???           45#?????????????????? 42CrMo????????????? ???????????????45#??? ?????г???????????? ??19????-?и????????????? ???????????к??????? ??????????????????????? ??????????????????????? ?????????????3960???? 5???????????г???????? ????????????????????? ????????????????ó?????    ???????           ???????????&nbs 20190 ASTM A2 15414 ??????????λ?????-???? 14563 ??????????  14367 dn???????????&nb 13893 ??????????|???????? 13076 ????????????|??? 13058 ??202??????????? 12600 ???????108*6??? 12589 ???????????|??? 12047 ??????????|???????? 12032 ????θ????????????|?? 11935 ???????????????|??? 11833 108*6?????1??? 11754 ??377????????- 11005 ????????????????? 10908 219*8.5??????? 10626 DN508*40??????? 10411