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???·???           45#?????????????????? 42CrMo????????????? ???????????????45#??? ?????г???????????? ??19????-?и????????????? ???????????к??????? ??????????????????????? ??????????????????????? ?????????????3960???? 5???????????г???????? ????????????????????? ????????????????ó?????    ???????           ???????????&nbs 20248 ASTM A2 15556 ??????????λ?????-???? 14633 ??????????  14464 dn???????????&nb 13957 ??????????|???????? 13196 ????????????|??? 13138 ??202??????????? 12670 ???????108*6??? 12650 ???????????|??? 12120 ??????????|???????? 12098 ????θ????????????|?? 12016 ???????????????|??? 11903 108*6?????1??? 11832 ??377????????- 11079 ????????????????? 10973 219*8.5??????? 10687 DN508*40??????? 10467