... /A106B/A53A/AP5LGradeB/A178/179 5.ISO,api oil pipeline Heavy wallthickness seamless steel pipeThick wall seamless steel pipeOD: ... economizer, reheated, superheated and steam pipeline of boilers.Main product: seamless steel pipe,pipe fittings, oil casing steel pipe,weld steel ... water, oil industry. Main product : seamless steel pipe,pipe fittings, oil casing steel pipe,weld steel pipe,Rubber Lined Steel ...