boiler tube;Certificate:ISO9001-2000,PED, API, TS16949; Out diameter:19.05-114.3mm; Wall thickness:2- ... drawn carbon seamless steel boiler tube2) Certificate:ISO9001-2000,PED, API, TS169493) Standard:ASTM A106, ASTM-A53, ASTM-A179, ASTM-A192, ASTM ... /T12/T22), ASTM-A333, ASTM-A335(P11/P22), ASTM-A519, API 5L , API 5CT, EN-10216, BS-3059, DIN17175, DIN2448/DIN1629 etc.4 ...