Welded pipe, also known as welded pipe, a large number of stainless steel plate or stainless steel band after bending forming, and then processed, welded and manufactured. These welded pipe can be divided into longitudinal welded pipe and spiral welded pipe according to the form of weld. According to the use of pipe can be divided into general welded pipe, galvanized pipe, blowing pipe, wire tube, pipe metric, roller tube, deep well pump, tube for automobile, transformer tube, welding, welding of thin-walled tube shaped tube and spiral welded pipe.
Among them, the general welded pipe is often used to transport low pressure fluid. Made with Q195A, Q215A and Q235A steel. The other is mainly used for easy welding mild steel manufacturing. Ordinary steel pipe and steel pipe should be thickened water pressure, bending and flattening test before use, but also have certain requirements on the surface quality of welded pipe, general delivery length ranging from 4-10m, according to the provisions of pipe wall thickness thick Pu two, also has a threaded and non threaded two.
With the improvement of welding technology and the convenience of processing, the welded pipe has been able to replace some of the seamless tubes which are not required. The welded pipe has been able to produce 219mm (8 inches) or more.
The oxygen pipe is used in steelmaking blowing pipe, usually with a small diameter pipe, specifications from 3/8 inch -2 inch eight. Made of 08, 10, 15, 20 or Q195-Q235 steel strips. In order to prevent corrosion, some must be treated with aluminizing.
Metric specifications of seamless steel pipe is welded pipe, the form is represented by the outer diameter of x mm thick wall pipe, with ordinary carbon steel, quality carbon steel or low alloy steel components of hot-rolled strip steel cold rolled strip steel, welding, or welding with tropical after cold drawing method.
Among them, metric welded pipe can be divided into ordinary and thin-walled, commonly used as structural parts, such as transmission shaft, or transport fluid, thin-walled for the production of furniture, lamps and so on, to ensure that the steel pipe strength and bending test.
Roller tube is mainly used in belt conveyor roller, welded pipe, generally water pressure and flattening test.
The so-called spiral welded pipe, the low carbon carbon steel strip by a plain steel or low alloy structure of the helix angle (called forming angle) rolled into a tube, then the tube seam welding made of stainless steel is often used for production of large diameter stainless steel pipe. The spiral welded pipe is mainly used in the pipeline of petroleum and natural gas. The specification of the steel pipe is indicated by the outer diameter and the wall thickness of X. The spiral welded pipe has one side welding and double side welding, and the quality of the welded pipe should be guaranteed to meet the relevant requirements in the water pressure test, the tensile strength and the cold bending property of the weld.
Source: China Welded Pipe Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)