The production process of seamless steel pipe:

Seamless steel pipe mainly complete through the tension reducing diameter. The stretch reducing process is hollow base material without mandrel continuous rolling process. Under the condition of guaranteeing the welding quality , the parent tube and pipe tension reducing diameter is the process of the whole welded pipe heated to above 950 degrees Celsius, then warp tension reducing mill (tension reducing mill, 24 times) rolled into a variety of diameter and wall thickness of the finished pipe. The hot-rolled steel pipe with this production process have essential difference to the ordinary high-frequency welded pipe, through metallographic organization and mechanical properties of the weld and the parent of the furnace heating can be achieved exactly the same. In addition, through multi pass tension reducing diameter rolling machine and automatic control make the dimensional accuracy of steel (especially the roundness and wall thickness precision pipe) is better than the same kind seamless pipe.