Refining Process Control Points of Seamless Tube

The raw material is rolled seamless tube, pipe cutting through the growth of the embryo to the degree of cutting machine is about one meter of the blank, and by conveyor belt to the furnace heating. The billet is fed into the heating furnace, the temperature is about 1200 degrees Celsius. Fuel is hydrogen or acetylene. Furnace temperature control is the key issue. Released after round tube piercing machine to go through the pressure of wearing empty. Generally more common punch is tapered roller punching machine, punching machine such high production efficiency, product quality, perforated expanding capacity, which can be worn a variety of steel. After perforation, round tube has been three-roll rolling, rolling or extrusion. To squeeze off the pipe after sizing, Sizing mill into high-speed rotating cone drill through perforated steel embryo formed steel. Pipe inside diameter is determined by the outside diameter sizing mill drill length. After sizing the pipe into the cooling tower through spray cooling pipe after cooling, it is necessary to be straightened. After straightening the steel conveyor belt to the metal detection machine (or pressure test) for internal testing. If the internal pipe cracks, bubbles and other issues, will be detected. After the selection of steel but also through strict quality control manual. After the steel quality, spray paint on number, size, batch number and so on. By a crane into the warehouse. Rolling control points is that strict quality control the incoming materials, to avoid too large due to oblique end face of the slab steel head caused by uneven and slab surface defects such as slag hole caused by a crack pipe, external scarring, etc.; strict control ring furnace, the heating temperature in the furnace, increase inspection efforts to adjust the centering tube heat, to ensure the centering hole of the tube precision to ensure uniform wall thickness of the pipe wall thickness tolerances and degrees; strengthen the high-pressure water In addition to the protection of scales and steel inner and outer surfaces of the inner and outer surface of the pipe to ensure the quality of the finish; to ensure the outer diameter of the outer diameter tolerances and roundness, tube processing control points is that strict control of steel quenching, tempering temperature, increase the yield strength, low internal stress of steel pipe; according to process requirements to control the temperature of the heat straightening, reducing pipe surface residual stress.