Seamless Steel Pipe Production Process And Performance Characteristics

The production process and performance characteristics of the seamless steel pipe are very good. The professional seamless pipe manufacturer should have a clear understanding of its production method, so I would like to introduce it to you here. If you are not very clear about the use or production of seamless pipes, you can continue to take a look at the following, it should help everyone.

There are many production methods for seamless tubes, mainly using perforation and other methods to produce seamless metal pipes around. It can be a circular or other profiled tube and a cross-section tube. It can be produced by hot rolling (about 80 to 90%) or cold rolling and cold drawing (about 10 to 20%). The seamless tube has an outer diameter ranging from 0.1 to 1425 mm and a wall thickness of 0.01 to 200 mm.

Seamless steel tube production process: The billet for hot-rolled tubes has round, square or polygonal ingots, rolled billets or continuous cast tube blanks. The quality of the tube blank has a direct impact on the quality of the pipe. The hot-rolled pipe has three basic processes: 1 the ingot or blank is pierced into a hollow thick-walled capillary tube on the punching machine; 2 the capillary is thinned on the stretching machine and extended into a waste pipe close to the finished wall thickness; 3 is rolled on the finishing mill The finished tube required.

1. Cold-rolled and cold-drawn tubes are produced for the production of small-diameter thin-walled, precision and profiled pipes. The production feature is a multi-process cycle process. Cold rolling with periodic cold-rolling tube machine, the elongation rate can reach 6-8. In the 1960s, it began to develop in the direction of high speed, multi-line, long stroke and long tube blank. In addition, small roll cold rolling mills have also been developed.

It is mainly used to produce extremely thin precision pipe with wall thickness less than 1mm. The cold rolling equipment is complicated, the tool processing is difficult, and the variety specifications are not flexible. Usually, the cold rolling and cold drawing combined process is adopted, that is, the cold rolling is used to reduce the wall to obtain large deformation. And then get a variety of specifications by cold drawing.

2. Three-roll mill production is mainly used to produce thick-walled pipes with high dimensional accuracy. The pipe produced by this method has a wall thickness accuracy of ± 5%, which is about twice as accurate as that produced by other methods.

One of the ways to produce seamless steel tubes by automatic rolling. The production equipment consists of a punching machine, an automatic rolling mill, a leveling machine, a sizing machine and a reducer.

1. The continuous rolling pipe production equipment consists of a piercing machine, a continuous rolling mill and a tension reducing machine.
2. The cycle rolling tube is produced by using polygonal and round steel ingots or continuous casting billets as raw materials, heated and perforated into cup-shaped blanks by water pressure, and then rolled into capillary tubes by a two-roller cross-rolling extension machine, and then with variable diameter holes. On the cycle rolling mill, the roll is rolled one turn and a section of steel pipe is rolled. The cycle rolling tube production uses steel ingots as raw materials, which is suitable for rolling large-diameter thick-walled steel pipes and variable-section pipes.

Introduction to the production process of mainstream seamless steel tubes:5. Extrusion tube production Firstly, the stripped round billet is perforated or reamed, heated by induction heating or salt bath, and the inner surface is coated with lubricant to be fed into the extruder. The metal passes through the ring between the die hole and the mandrel. The gap is squeezed into a tube.

1. Spinning tube production The flat plate or hollow blank is processed into a thin-walled pipe by one or more spinning on a spinning machine.
2. The traditional method of pipe jacking production is that the billet is hydraulically perforated and cross-rolled to form a cup-shaped capillary tube. The long mandrel bar is inserted into the bottom of the capillary tube by the push rod, and the roller formwork is gradually reduced through a series of holes., top rolled into a tube.
3. The guide tube rolling production is also known as the Diesel method. The perforated long tube with the long mandrel is rolled into a thin-walled tube on a guide tube mill.