Introduction:
Straight seam welded steel pipe is a steel pipe whose seam is parallel to the longitudinal direction of the steel pipe. Usually divided into metric welded steel pipes, welded thin-walled pipes, transformer cooling oil pipes, etc.
Related introduction:
Unless the seamless steel pipe has no weld or is processed by itself, there is only one weld, and the welding of large pipes is spiral! Large pipes are rarely used, and the length is generally self-determined.
Product use:
1. Straight welded steel pipes can be used as low-pressure water pipes, such as water supply and drainage pipes, heating pipes, low-pressure process pipes and low-pressure fire-fighting pipes.
2. Directly welded steel pipes can also be made into scaffold pipes.
3. Or become a wire and cable protection tube.
4. It can also be used as structural support pipes, such as steel structure support pipes, concrete formwork support pipes, grid steel structure pipes, columns of small temporary buildings, etc.
5. Used as a decorative tube. For example, the artistic modeling pipeline of decoration engineering should be painted, or the handrails and protective railings of stairs should be painted.
6. It can also be used as a casing or a pipe with reserved holes and cut into small pieces for use.
What's the difference between ordinary steel pipes and straight welded steel pipes?
Welded steel pipe: also called welded pipe, it is made of steel plate or steel strip after bending and then welding. According to the weld form, it is divided into straight welded pipe and spiral welded pipe. According to the purpose, it can be divided into ordinary welded pipes, galvanized welded pipes, oxygen-blown welded pipes, silk sleeves, metric welded pipes, idler pipes, deep well pump pipes, automobile pipes, transformer pipes, welded thin-walled pipes, welded special-shaped pipes and spiral welded pipes.
Ordinary welded pipe: Ordinary welded pipe is used for conveying low-pressure fluid. Made of steel Q 195A, Q2 15A and Q235A? . It can also be made of other low carbon steels that are easy to weld. Steel pipes have to undergo water pressure, bending, flattening and other experiments, which have certain requirements for surface quality. Usually the delivery length is 4- 10m, and it is often required to deliver according to the length (or double the length). The specifications of welded pipes are expressed in nominal caliber (millimeters or inches). The nominal caliber is different from the actual situation. Welded pipes can be divided into ordinary steel pipes and thickened steel pipes according to the specified wall thickness, and steel pipes can be divided into threaded and non-threaded pipes according to the pipe end form.
Classification of welded steel pipes
Classification method
Classification by purpose
According to the purpose, it can be divided into ordinary welded pipes, galvanized welded pipes, oxygen-blown welded pipes, silk sleeves, metric welded pipes, idler pipes, deep well pump pipes, automobile pipes, transformer pipes, welded thin-walled pipes, welded special-shaped pipes and spiral welded pipes.
Ordinary welded pipe: Ordinary welded pipe is used for conveying low-pressure fluid. Made of steel Q 195A, Q2 15A and Q235A. It can also be made of other low carbon steels that are easy to weld. Steel pipes have to undergo water pressure, bending, flattening and other experiments, which have certain requirements for surface quality. Usually the delivery length is 4- 10m, and it is often required to deliver according to the length (or double the length). The specifications of welded pipes are expressed in nominal caliber (millimeters or inches). The nominal caliber is different from the actual situation. Welded pipes can be divided into ordinary steel pipes and thickened steel pipes according to the specified wall thickness, and steel pipes can be divided into threaded and non-threaded pipes according to the pipe end form.
Galvanized steel pipe: In order to improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into hot dip galvanizing and electrical steel zinc. Hot-dip galvanizing has a thick zinc layer and low cost.
Oxygen-blown welded pipe: used as oxygen-blown pipe for steelmaking, small-diameter welded steel pipe is generally used, with eight specifications ranging from 3/8 inch to 2 inch. Made of 08, 10, 15, 20 or Q 195-Q235 steel strip. In order to prevent corrosion, some of them are aluminized.
Wire sleeve: it is also a common carbon steel welded steel pipe, which is used in concrete and various structural power distribution projects. Commonly used nominal diameters range from 13-76mm. The wall of wire sleeve is thin, and it is often coated or galvanized before use, so cold bending test is needed.
Metric welded pipe: Welded steel pipe with seamless pipe specifications, expressed by outside diameter * wall thickness mm, is made of ordinary carbon steel, high-quality carbon steel or ordinary low-alloy steel by hot and cold strip welding or cold drawing after hot strip welding. Metric welded pipes can be divided into ordinary pipes and thin-walled pipes, which are often used as structural parts, such as transmission shafts, or to transport fluids. Thin-walled pipes are used to produce furniture, lamps, etc. , and shall ensure the strength and bending test of steel pipe.
Roller tube: welded steel tube for belt conveyor roller, generally made of Q2 15, Q235A, B steel and 20 steel, with a diameter of 63.5-219.0mm. There are certain requirements for the curvature, end face perpendicular to the center line and ellipticity of the tube. Generally, water pressure and flattening tests are carried out.
Transformer tube: used to manufacture transformer radiator tube and other heat exchangers. It is made of ordinary carbon steel and needs flattening, flaring, bending and hydrostatic test. Steel pipes are delivered in fixed length or double length, which has certain requirements for steel pipe bending.
Special-shaped pipes: square pipes, rectangular pipes, hat pipes and steel pipes for hollow rubber steel doors and windows, which are welded by common carbon structural steel such as 16Mn and steel belts, are mainly used as agricultural machinery parts and steel doors and windows.
Welded thin-walled tube: mainly used for making furniture, toys, lamps and so on. In recent years, stainless steel thin-walled tubes are widely used in high-end furniture, decoration, fences and other fields. Spiral welded pipe: it is made by rolling low-carbon structural steel or low-alloy structural steel strip into tube blank according to a certain spiral angle (called forming angle), and then welding the tube seam. It can produce large diameter steel pipe from narrow strip steel. Spiral welded pipe is mainly used for oil and gas pipelines, and its specification is expressed by external diameter * wall thickness. Spiral welded pipe is single-sided or double-sided, and the welded pipe shall ensure that the hydrostatic test, tensile strength and cold bending performance of the weld meet the requirements.
Classification by weld shape
It can be divided into straight welded pipe and spiral welded pipe.
Straight welded pipe: simple production process, high production efficiency, low cost and rapid development.
Spiral welded pipe: generally, the strength is higher than that of straight welded pipe, and welded pipe with larger diameter can be produced from narrow blank.
Welded pipes with different diameters can also be produced from blanks with the same width. However, compared with the straight seam pipe with the same length, the weld length increases by 30~ 100%, and the production speed is lower. Therefore, straight seam welding is mostly used for welded pipes with smaller diameter, and spiral welding is mostly used for welded pipes with larger diameter.
Classification by welding method
According to different welding methods, it can be divided into arc welded pipe, high-frequency or low-frequency resistance welded pipe, gas welded pipe, furnace welded pipe and Bundy pipe.
Welded steel pipe: used for oil drilling and machinery manufacturing.
Furnace welded pipe: can be used as water gas pipeline, etc. Large diameter straight welded pipe is used for high pressure oil and gas transportation. Spiral welded pipe is used for oil and gas transportation, pipe piles, piers, etc. Classification by end shape
It is also divided into circular welded pipe and special-shaped (square, flat, etc.). ) welded pipe.
Seeing this, I believe you have found how widely the straight welded steel pipe is used in our life. As can be seen from the above introduction, straight welded steel pipes can be seen almost everywhere in our life. As a low-pressure water pipe, it may be used as a scaffold pipe in our home. You may have seen it on the construction site, but you may not have noticed it before. However, after my explanation, you will see straight welded steel pipes everywhere in your life.
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