Seamless Steel Pipe Rolled On Finishing Mill

Seamless steel pipe and ssaw steel pipe are widely used in life, and today we will talk about the former rolling process.

Hot-rolled tube blanks have round, square or polygonal ingots, rolling blanks or continuous casting tube blanks. The tube blank quality has a direct impact on the quality of the tube. The hot-rolled tube has three basic processes: 1 The ingot or billet is pierced into a hollow thick-walled capillary tube on a piercing machine; 2 The capillary tube is rolled on an extension machine, and it is extended into a waste tube close to the finished wall thickness;

1. cold-rolled, cold-drawn tube production for the production of small-caliber thin-walled, precision and special-shaped pipe. The production feature is a multi-process recycling process. Cold rolling with a cold cycle mill, the elongation rate of up to 6 to 8. 60 years began to high-speed, multi-line, long-stroke, long tube billet direction. In addition, small roll cold mills have also been developed. It is mainly used for the production of ultra-thin precision pipe materials with a wall thickness of less than 1mm. The cold rolling equipment is complex, the tool processing is difficult, and the specifications and specifications are inflexible; cold rolling and cold drawing combined processes are usually used, that is, cold rolling is used to reduce the wall thickness and large deformations are obtained., 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. Pipes produced by this method have an accuracy of ±5% in wall thickness, which is about twice as high as that produced by other methods. One of the ways to produce seamless steel tubes by automatic tube rolling. The production equipment consists of a perforator, an automatic tube mill, a homogenizer, a sizing machine, and a reducer.
3. The continuous rolling tube production equipment consists of a perforator, a continuous tube mill, and a tension reducer.
4. The production of periodic rolling tube takes polygonal and round steel ingots or continuous casting blanks as raw materials, after heating, it is perforated into cup-shaped blanks by hydraulic pressure, then rolled into capillary tubes by two-roller oblique rolling extruder, and then in the slot with variable diameter holes. On the rolling mill of the cycle, the roll rolls a circle of steel pipe. The cycle rolling tube production uses steel ingots as raw materials, and is suitable for rolling large-diameter thick-walled steel tubes and variable-section tubes.
5. Production of extruded tubes First, the peeling round blanks are perforated or reamed, heated by induction heating or salt bath, and coated with lubricant on the inner surface of the extruder. The metal passes through the hole between the die hole and the core rod. The gap is extruded into a tube.
6. Spinning tube production Flat or hollow blanks are spin-processed into thin-walled tubes one or more times on a spinning machine.
7. The traditional method of pipe jacking production is that the billet is extended into a cup-shaped capillary tube by hydraulic perforation and oblique rolling, and the long mandrel is inserted into the bottom of the capillary tube by the push rod, and the roller frame is gradually reduced through a series of hole slots., Top rolled into tube.
8. the guide plate rolling tube production, also known as Disel method. The perforated capillary tube with long mandrel is rolled into a thin-walled tube on the guide plate mill.

A worker from a steel pipe company, which is located in China.