Introduction
The general production process of seamless steel pipe can be divided into cold drawing and hot rolling.
The production process of cold rolled seamless steel pipe is generally more complex than that of hot rolling. The tube billet should first be rolled by three rolls, and the sizing test should be carried out after extrusion. Then enter the annealing process, annealing to acid liquid pickling, pickling should pay attention to whether there is a large number of bubbles on the surface, if there is a large number of bubbles that indicate the quality of the steel pipe can not reach the corresponding standard. The appearance of cold-rolled seamless steel pipe is shorter than that of hot-rolled seamless steel pipe. The wall thickness of cold-rolled seamless steel pipe is generally smaller than that of hot-rolled seamless steel pipe, but the surface looks brighter than that of thick-walled seamless steel pipe. The surface is not too rough and the diameter is not too much burr.
Application
The Seamless Pipe can be used for boiler, Air Heat Exchanger, Shell And Tube Heat Exchanger, geological seamless steel pipe and petroleum Seamless Tube and so on.
Seamless steel pipe has hollow section, widely used for conveying fluid pipeline, such as conveying oil, natural gas, gas, water and some solid materials, etc. Compared with solid steel such as round steel, steel pipe is a kind of economic section steel because of its light weight and the same bending and torsional strength.
It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. It can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing hours, and has been widely used in the manufacture of steel pipe.
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