boiler tube;Certificate:ISO9001-2000,PED, API, TS16949; Out diameter:19. ... steel boiler tube2) Certificate:ISO9001-2000,PED, API, TS169493) Standard:ASTM A106, ASTM-A53, ASTM-A179, ASTM-A192, ASTM-A210, ASTM-A213(T11/T12/T22), ASTM-A333, ASTM- ... A335(P11/P22), ASTM-A519, API 5L , API ...