1)boiler tube ASTM A 179seamless steel pipe 2)out diameter:6- ... seamless steel pipesseamless boiler pipekey word:steel pipeproducts name:casing pipe,steel pipe,seamless pipe,seamless tube,pipe,tube,seamless steel pipe ... seamless pipe,seamlesstube,seamless steel tube,steel tube,tube TypeAPI 5l seamless steel pipe,ASTM A 179 seamless boiler tube,seamless boiler pipeOuter diameter6-820mmWall thickness1mm ...