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Production process of ST44 pipe
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Production process of ST44 pipe

(Summary description)This paper describes the production process of ST44 pipe.

Production process of ST44 pipe

(Summary description)This paper describes the production process of ST44 pipe.

Information

The production methods of ST44 pipe are roughly divided into cross rolling and extrusion methods.ST44 pipe produced by cross-rolling is made by piercing the tube embryo with a cross-rolling roll and then extending it with a rolling mill.This method has a fast production speed, but requires a high machinability of the billet. It is mainly suitable for the production of carbon steel and low alloy steel pipes.

The extrusion principle is to use a perforator to punch billets or ingots and then press them into steel pipes. This method is less efficient than the oblique rolling method and is suitable for the production of high-strength alloy steel pipes.

Both cross-rolling and extrusion methods must first heat the billet or ingot. The steel tube produced is called hot-rolled tube.ST44 pipes produced by hot working can sometimes be cold processed as required.There are two methods for cold working: one is cold-drawing, i.e. drawing ST44 pipe through the drawing die to make the steel tube thinner and elongate gradually;Another method is cold rolling, which applies the hot rolling mill invented by the Mennesmann brothers to cold working.ST44 pipe cold working can improve the dimensional accuracy and finish of steel pipes, improve the mechanical properties of materials, etc.

Seamless ST44 pipe is mainly accomplished by tension reducing, which is a continuous rolling process of hollow base metal without mandrel.Under the condition of guaranteeing the welding quality of ST44 pipe, the tension reducing process of welded pipe is to heat the welded pipe as a whole to above 950 C and then to roll the finished pipe with various external diameters and wall thicknesses by tension reducing machine (24 passes in total). The ST44 pipe produced by this process is essentially different from the common high frequency welded pipe.The metallographic structure and mechanical properties of the ST44 pipe weld after heating in the heating furnace are identical to those of the matrix.

 

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