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???·???           45#?????????????????? 42CrMo????????????? ???????????????45#??? ?????г???????????? ??19????-?и????????????? ???????????к??????? ??????????????????????? ??????????????????????? ?????????????3960???? 5???????????г???????? ????????????????????? ????????????????ó?????    ???????           ???????????&nbs 20255 ASTM A2 15572 ??????????λ?????-???? 14640 ??????????  14483 dn???????????&nb 13963 ??????????|???????? 13206 ????????????|??? 13147 ??202??????????? 12676 ???????108*6??? 12651 ???????????|??? 12127 ??????????|???????? 12105 ????θ????????????|?? 12024 ???????????????|??? 11910 108*6?????1??? 11839 ??377????????- 11085 ????????????????? 10979 219*8.5??????? 10696 DN508*40??????? 10476