Seamless Steel Tubing Production Methods

1.The method of production of seamless steel tubing, which is roughly divided into slant rolling (mannesmann method) and extrusion method.The slant rolling (mannesmann method) is the first to use a slant roll to perforate the pipe and then extend it by rolling mill.This method is fast in production, but it has high machinability requirement for tube billet, which is mainly suitable for producing carbon steel and low alloy steel pipe.2.Squeeze the law is the tube billet with punch or ingot perforation, reoccupy extruder extrusion into a steel tube, this method than the low efficiency of skew rolling method,.It is suitable for the production of high strength alloy steel pipe.3.The slant and extrusion method must first be heated by billet or ingot, and the steel tube is called hot rolling tube.Steel pipes produced by hot processing are sometimes refrigerated as needed.There are two kinds of cold processing: one is cold drawing, which is to pull the steel tube out of the tube and make the tube become thin and elongated.The other method is cold rolling, which is the method of applying the heat mill from the mannesmann brothers to cold processing.The cold machining of seamless steel tube can improve the precision of the steel pipe and the processing and finish, improve the mechanical properties of the material.4.The seamless process of steel pipe is achieved by reducing the diameter of tension, which is the continuous rolling process of the hollow parent bar without the core rod.Under the condition of guarantee the quality of mother tube welding, welding tube tension reducing process is to welded pipe whole heated to 950 degrees Celsius above, then through the tension reducing mill (tension reducing mill a total of 24 times) rolled into a variety of outside diameter and wall thickness of the finished tube, adopt the process of hot rolled steel pipe with ordinary high-frequency welded pipe have substaintial distinction through heating furnace after its weld and the microstructure and mechanical properties of matrix can achieve the same in addition, through many times of tension reducing mill rolling and automatic control made the size precision of steel tube (especially the tube roundness and wall thickness accuracy) is superior to the same kind of seamless tube.Developed countries in the world production of fluid pipe, boiler tube have been used a lot of welded pipe seamless process, with the development of the society,domestic situation of hot rolled welded pipe instead of seamless tube gradually has formed.

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