Shijiazhuang Steel manufacturers process. The elbow is down, if done long radius elbow, such as the use of Shijiazhuang steel pipe manufacturers, first selected specifications, proposed pipe material. Expanding rate, calculated by the general expanding rate of 33% -35%, and down to push back. Radius of 219mm short of expanding the general rate of 50%. Selected raw materials, press elbow cutting specifications, and then consider the radius of curvature, for example, 90 ° elbow, Shijiazhuang Steel manufacturers through its curvature can be calculated how long the material can be processed under a 90 ° elbow. Shijiazhuang Steel manufacturers can be calculated by theoretical calculation, and then the length of the cut length. Finally, push the system to the thermal material. Shijiazhuang Steel manufacturers push the system drive you may have seen, actually very simple. Shijiazhuang is a horn-shaped steel core manufacturers head or mandrel, mandrel from small thicken, push the system process is a process of expanding band bending. Behind a support, the cutting mandrel pipe penetration, behind the arch frame will have a fixed mandrel. The middle of a car, car and some by hydraulic, mechanical drive through some of the screw drive, and then push the car forward. Pushing the tube along the mandrel car go forward, an induction coil outside the mandrel, the tube heating, heat is good, and then push the pipe under the car, a good one for processing. After push, elbow to shaping under this thermal condition. After some elbow handled properly because it will distort, it is not allowed. In addition, after the Shijiazhuang, pipe manufacturers Tuitou are generally large diameter front end, through plastic mold for shaping. Plastic mold is actually a press, to set the mold, the two semi-circular, up and down each one. After shaping the outside diameter size of the finished product to meet the request. Since the material thickness of the wall thickness to be controlled. Elbow and pipe wall thickness tolerances are the same, are ± 12.5%. In the push system process, Shijiazhuang Steel