00619nam a2200205 4500 0015019 20260608202921.0 260224s2008 dcu 660.061.3 A512 938-B 0015019 TR 938-B Use of 9Cr-1Mo-V (grade91) steel in the oil refining industry API Technical Report 938-B API 938-B Washington American Petroleum Institute, API 2008 2009-07-20 ; 2009-07-20 43 p. LIBRO American Petroleum Institute, API 105 170123 170123 0 0 0 0 237942 BAAB BAAB 660.061.3 A512 938-B 0015019 2026-03-05 200044949 0 660.061.3 A512 938-B 0015019 200044949 2026-03-05 15:12:24 2026-03-05 NORMA