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???·???           45#?????????????????? 42CrMo????????????? ???????????????45#??? ?????г???????????? ??19????-?и????????????? ???????????к??????? ??????????????????????? ??????????????????????? ?????????????3960???? 5???????????г???????? ????????????????????? ????????????????ó?????    ???????           ???????????&nbs 20141 ASTM A2 15295 ??????????λ?????-???? 14489 ??????????  14287 dn???????????&nb 13845 ??????????|???????? 13004 ????????????|??? 12985 ??202??????????? 12541 ???????108*6??? 12540 ???????????|??? 11988 ??????????|???????? 11958 ????θ????????????|?? 11871 ???????????????|??? 11771 108*6?????1??? 11691 ??377????????- 10965 ????????????????? 10846 219*8.5??????? 10576 DN508*40??????? 10362