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???·???           45#?????????????????? 42CrMo????????????? ???????????????45#??? ?????г???????????? ??19????-?и????????????? ???????????к??????? ??????????????????????? ??????????????????????? ?????????????3960???? 5???????????г???????? ????????????????????? ????????????????ó?????    ???????           ???????????&nbs 20193 ASTM A2 15415 ??????????λ?????-???? 14569 ??????????  14367 dn???????????&nb 13893 ??????????|???????? 13080 ????????????|??? 13062 ??202??????????? 12603 ???????108*6??? 12589 ???????????|??? 12047 ??????????|???????? 12032 ????θ????????????|?? 11935 ???????????????|??? 11834 108*6?????1??? 11755 ??377????????- 11006 ????????????????? 10908 219*8.5??????? 10627 DN508*40??????? 10412