... :6-820mm thk:1-100mm length5.8M 6M 12M 3)standard:API 5L, A179 ASTM A179 seamless steel tubeASTM A179 seamless ... and selling various of seamless stee pipes ,including the API \stainless steel tubesAPI 5L seamless steel pipe,seamless steel ... seamless boiler tube,seamless boiler pipeOuter diameter6-820mmWall thickness1mm-100mmStandardASTM ,API ,DINMaterialA25, Grade A, B, X42, X46, X52, X60, X65, ...