Pipe rolling technology overview

The concept of pipe: Pipe Rolling technology is the method of creating steel by rolling method, like the kind on the other, rolling (rolled plate, rolling, rolling, rolling, thread rolling gears …), pipe also follow principle of metal plastic deformation between the rolling axis.

Classification of welded steel tube and steel casting Pipes: based on the production technology and the use of embryos created shapes, to break out of the Rolled tube technology products into two large categories: cast steel pipe (round ingots) and welded steel (ingots, sheets of foil).

1. Casting: steel pipe 

Based on the technology of manufacturing, subdivided into tubes, hot rolled steel and cast steel casting steels. cast steel tube cold-rolled tubes and pipes including the back of the box.

a). Overview of process technology

Hot rolled (pressure pipe): circular Blanks-cut hole >-heated >-> pushing pressure-hole drainage > default-> diameter-cooling tube > embryos->-> straightening-> pressure check-marked-warehousing > >.

Cold-rolled round Billets:-cut hole >-heated >-the fire reduction >->-pickling spray oil >-> (copper plated)-cold rolled repeatedly >-> > heat treatment – the embryonic tube-> check pressure-mark > warehousing->.

1. Steel welded pipe:

Based on the technology of welding that divided into pipe welding, welding tube furnace and automatic welding. Base on form South Korea divided into two types of pipe welding is welding pipe straight and spiral welded tubes, based on the shape of the welding head divided into circular welding and welding misshapen (square, necktie …). Based on the raw materials and the use of categories.

Steel welded pipe production process can be summarized by the following diagram:
 

Basic comparison:

-Cost: tubes, steel less expensive than cast steel pipe.

-Size: welded pipes have larger length and thướt.

-Pressure: casted steel tube under pressure better than welded steel (about 20%).

-Tolerance for welded steel pipe: there are large discrepancies. Nowadays people allow tolerance for welded steel tube with large should the use of welded steel tube is also quite popular. However the casting steel pipe manufacturing defects is limited compared to the welding method.