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Do you know the classification of welded steel pipe?

Do you know the classification of welded steel pipe? Let's learn about it!

According to different welding methods, it can be divided into arc welding pipe, high frequency or low frequency resistance welding pipe, gas welding pipe, furnace welding pipe, Bondi pipe, etc.

Electric welded steel pipe: used in oil drilling and mechanical manufacturing industry.

Furnace welded pipe: can be used as water gas pipe, large diameter straight seam welded pipe for high pressure oil and gas transmission, etc; Spiral welded pipe is used for oil and gas transportation, pipe pile, pier, etc. According to the weld shape classification, it can be divided into longitudinal welded pipe and spiral welded pipe

Longitudinal welded pipe: simple production process, high production efficiency, low cost, rapid development.

Spiral welded pipe: its strength is generally higher than that of longitudinal welded pipe. It can be used to produce welded pipe with larger diameter by using narrow blank, and welded pipe with different pipe diameter can be produced with blank with the same width. However, compared with the straight seam pipe of the same length, the weld length increases by 30 ~ 100%, and the production speed is lower. Therefore, most of the smaller diameter welded pipe adopts longitudinal welding, while the large diameter welded pipe mostly adopts spiral welding.

Spiral seam welded steel pipe is divided into automatic submerged arc welding steel pipe and high frequency welding steel pipe.

A. spiral seam automatic submerged arc welding steel pipe is divided into class a pipe and class B pipe according to the pressure of conveying medium. Class a pipe is generally welded with ordinary carbon steel Q235, q235f and ordinary Low Alloy Structural Steel 16Mn, while class B pipe is welded with Q235, q235f, Q195 and other steels for low pressure fluid transportation.

B. spiral seam high-frequency welded steel pipe, spiral seam high-frequency welded steel pipe, there is no unified product standard, generally using ordinary carbon steel Q235, q235f and other steel products. According to the use, it can be divided into general welded pipe, galvanized welded pipe, oxygen blown welded pipe, wire sleeve, metric welded pipe, roller tube, deep well pump pipe, automobile pipe, transformer pipe, electric welding thin wall pipe, electric welding special-shaped pipe and spiral welded pipe. General welded pipe: General welded pipe is used to transport low pressure fluid. It is made of q195a, q215a and Q235A steel. It can also be made of other mild steel which is easy to weld. Water pressure, bending, flattening and other tests shall be carried out on the steel pipe. There are certain requirements for the surface quality. Generally, the delivery length is 4-10m, and the delivery is often required in fixed length (or multiple length). The specification of welded pipe is expressed by nominal diameter (mm or inch). The nominal diameter is different from the actual one. According to the specified wall thickness, there are two kinds of welded pipe: ordinary steel pipe and thickened steel pipe; according to the form of pipe end, the steel pipe is divided into two types with thread and without thread. Galvanized steel pipe: in order to improve the corrosion resistance of steel pipe, general steel pipe (black pipe) is galvanized. Galvanized steel pipe is divided into hot-dip galvanizing and electro galvanizing. The hot-dip galvanizing layer is thick and the cost of galvanizing is low.

Oxygen blowing and welding pipe: it is used for steel-making oxygen blowing pipe. Generally, it is made of small-diameter welded steel pipe, with specifications of 3 / 8-2-inch. It is made of 08, 10, 15, 20 or q195-q235 steel strip. In order to prevent corrosion, some of them are aluminized.

Wire sleeve: it is also common carbon steel welded steel pipe, which is used in concrete and various structure power distribution projects. The commonly used nominal diameter is from 13-76mm. The wall of wire sleeve is thin, and most of them are used after coating or galvanizing, so cold bending test is required.

Metric welded pipe: the welded steel pipe with the specification of seamless pipe, expressed by outer diameter * wall thickness mm, is welded by hot strip and cold strip of ordinary carbon steel, high quality carbon steel or general energy low alloy steel, or made by hot strip welding and cold drawing. The metric welded pipe is divided into general energy and thin wall, which are commonly used as structural parts, such as transmission shaft, or conveying fluid. Thin wall is used to produce furniture, lamps, etc. the strength and bending test of steel pipe should be ensured.

Idler pipe: used for electric welding steel pipe of belt conveyor idler, generally made of Q215, Q235A, B steel and 20 steel, with diameter of 63.5-219.0mm. There are certain requirements for the pipe bending, end face to be perpendicular to the center line and ovality.

Transformer tube: it is used for manufacturing transformer heat pipe and other heat exchanger. It is made of ordinary carbon steel. It is required to carry out flattening, expanding, bending and hydraulic test. The steel pipe is delivered in fixed length or multiple length, which has certain requirements on the bending degree of steel pipe.

Special shaped pipe: square pipe, rectangular pipe, cap shaped pipe, hollow rubber steel door and window steel pipe welded by ordinary carbon bonded structural steel and 16Mn steel strip, mainly used for agricultural machinery components, steel windows and doors, etc. Welding thin-walled tube: mainly used to make furniture, toys, lamps, etc. At present, the thin-walled tube made of stainless steel strip is widely used, such as high-grade furniture, decoration, fence, etc.

Spiral welded pipe: low carbon carbon structural steel or low alloy structural steel strip is rolled into tube blank according to a certain helix angle (called forming angle), and then the pipe seam is welded to make it. It can produce large diameter steel pipe with narrow strip steel. Spiral welded pipe is mainly used for oil and natural gas pipeline, and its specification is expressed by outer diameter * wall thickness. For spiral welded pipe with single side welding and double side welding, the water pressure test, tensile strength and cold bending performance of weld shall meet the requirements.

This article in the welding steel pipe arrangement, this viewpoint does not represent this station viewpoint, thanks to read this article.


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