The latest production technology of seamless steel tube

تاريخ:2018-01-31 رأي:2161
Generally the latest production technology of seamless steel tube is divided into oblique rolling method (mennesmann method) and kneading method.

Slanting method (Mennesmann method) is the first use of oblique roller seamless steel pipe perforation, and then use the mill to extend it. This method of production speed, but the seamless steel tube billet machining requirements higher, mainly for the production of carbon steel and low alloy steel pipe.

Kneading method is to use perforation machine seamless steel tube or ingot perforation, kneading machine and then kneaded into seamless steel pipe, this method is lower than the power of the cross rolling method, suitable for producing high strength alloy seamless steel pipe.

Slanting method and kneading method must be the first tube or ingot heating, the production of steel known as hot-rolled seamless steel pipe. The seamless pipe produced by hot working sometimes can be cold worked according to the need. Cold-working in two ways: one is the cold-drawing method, that is, through the drawing of seamless steel pipe drawing, the pipe gradually thinning, elongation; another method is the cold-rolled method, it is Mengnei Man Brothers invented the hot-rolling machine used in cold-working methods. Cold-rolled seamless steel pipe, pipe can advance the standard accuracy and finish, improve the mechanical properties of the material.

Seamless steel pipe (hot-rolled seamless steel pipe) production process
Seamless steel pipe mainly through the tension reducing to the end of the process of reducing the diameter of the hollow base metal without mandrel continuous rolling process. In the premise of ensuring the quality of the mother pipe welding, the pipe tensile reduction process is the overall heating pipe to 950 degrees Celsius, and then by tension reducing machine (stretch reducing machine a total of 24 times) rolling into a variety of outer diameter and wall thick finished seamless pipe, the use of this technology produced by the hot-rolled steel pipe and the usual high-frequency welded seamless pipe is essentially different from the heating furnace after the weld and the parent metal structure and mechanical properties can be completely consistent. In addition, the standard accuracy of the steel pipe (especially the tube roundness and wall thickness accuracy) is superior to the similar seamless steel pipe through the multi-pass tension reducer rolling and automatic control. The world's developed countries produce fluid pipe, boiler seamless pipe has many welded pipe seamless steel pipe technology, with the community started, the domestic hot-rolled pipe gradually replace the seamless steel pipe situation has now been formed.
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