Is it better to use spiral steel pipe or straight seam steel pipe for drainage pipe?

Is it better to use spiral steel pipe or straight seam steel pipe for drainage pipe?

Spiral steel pipe is a spiral seam steel pipe welded by automatic double wire and double submerged arc welding process. The spiral steel pipe sends the strip steel into the welding pipe unit. After the rolling of multiple rollers, the strip steel gradually rolls up to form a circular tube billet with an open gap. The reduction amount of the extrusion roller is adjusted to control the weld seam gap at 1~3mm and level the welding mouth at both ends.

Generally speaking, spiral steel pipe is used in drainage pipes, because the strength of spiral welded pipe is generally higher than that of straight seam steel pipe, and the welded pipe with larger diameter can be produced with narrow blank, and the welded pipe with different diameter can also be produced with the same width of blank. However, compared with the same length of straight seam pipe, the weld length and production speed are lower. Therefore, the smaller diameter welded pipe mostly adopts straight seam welding, while the larger diameter welded pipe mostly adopts spiral welding.

Also has generally DN350 above, the tube diameter is big why USES the spiral tube instead of the straight seam tube? Because the weld of spiral steel pipe is spiral, the pressure of liquid will be distributed on all sides of the pipe to enhance the strength of the pipe. If the use of straight seam steel pipe, the general large pipe is rolled up with steel plate for direct welding, the need for large steel plate, greatly increase the production difficulty, so the larger diameter will use spiral pipe. As a professional spiral pipe manufacturer, we have several spiral pipe production lines, which can produce spiral welded pipes with diameter of 219-2820mm and wall thickness of 6-28mm. The price is affordable and the quantity is large.

Eight characteristics of precision steel pipe

Eight characteristics of precision steel pipe

1. Smaller outside diameter.

2. High precision can be used for small batch production.

3. Cold drawing finished products have high precision and good surface quality.

4. The cross area of steel pipe is more complex.

5. Steel pipe performance is better, metal is relatively dense.

6. Cold drawing finished products have high precision and good surface quality.

7. The cross area of steel pipe is more complex.

8. Steel pipe performance is better, metal is relatively dense.

Calculation formula of precision steel pipe :[(outer diameter - wall thickness)* wall thickness]*0.02466=kg/ m (weight per meter)

Tell us your requirements for precision steel pipe, and we will complete all the rest, which will make you satisfied.

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Production process of large diameter welded pipe

Large-diameter welded pipe is a spiral seam steel pipe, which is made of strip steel coil as raw material, often formed by warm extrusion, and welded by automatic double-wire and double-sided submerged arc welding process. The spiral steel pipe sends the strip steel into the welding pipe unit. After the rolling of multiple rollers, the strip steel gradually rolls up to form a circular tube billet with an open gap. The reduction amount of the extrusion roller is adjusted to control the weld seam gap at 1~3mm and level the welding mouth at both ends.

Following the Large Diameter Steel Pipe manufacturer China would like to share with us.

Production process of large-diameter welded pipe:

(1) raw materials: strip coil, welding wire, flux. Rigorous physical and chemical examination must be carried out before investment.

(2) the end of the strip shall be butt joint by single wire or double wire submerged arc welding. After the steel pipe is rolled, automatic submerged arc welding shall be adopted.

(3) before forming, the strip is smoothed, trimmed and planed, its surface is cleaned and transported, and its edges are bent.

(4) electric contact pressure gauge is adopted to control the pressure of oil cylinder on both sides of the conveyor, ensuring the smooth transportation of the strip.

(5) external control or internal control roll forming.

(6) weld gap control device is adopted to ensure that weld gap meets welding requirements, and pipe diameter, wrong edge quantity and weld gap are strictly controlled.

SSAW LSAW Carbon Welding Steel Pipe

(7) both internal and external welding are performed by single or double wire submerged arc welding with American Lincoln welding machine, so as to obtain stable welding quality of the Large Diameter Spiral Steel Pipe.

(8) all welded welds are inspected by online continuous ultrasonic automatic flaw tester, ensuring 100% non-destructive testing coverage of spiral welds. If there are defects, automatic alarm and spraying mark, production workers according to this at any time to adjust the process parameters, timely elimination of defects.

(9) use an air plasma cutting machine to cut the steel tube into a single root.

(10) after cutting into a single steel pipe, each batch of steel pipes shall carry out a strict first inspection system to check the mechanical properties of welding seams, chemical composition, dissolution status, surface quality of steel pipes and through nondestructive inspection to ensure that the pipe production process is qualified, before it is officially put into production.

(11) where there is continuous acoustic inspection mark on the welding seam, manual ultrasonic and X-ray reexamination shall be conducted. If there is a defect, it shall be repaired and then nondestructive inspection shall be conducted again until it is confirmed that the defect has been eliminated.

(12) the tube where the butt welding seam of strip steel and the t-joint intersecting spiral welding seam are located shall all be examined by X-ray television or film.

(13) each steel pipe is tested by hydrostatic test, and the pressure is radial sealed. The test pressure and time are strictly controlled by the microcomputer testing device of steel pipe water pressure. Automatic printing record of test parameters.

(14) the pipe end is machined to control the verticality of the end face, groove Angle and blunt edge accurately.

Method of removing embroidery of straight seam steel pipe

Method of removing embroidery of straight seam steel pipe:

Welded steel pipe is also known as welded pipe, is made of steel plate or strip after curling forming steel pipe. Welded steel pipe production process is simple, high production efficiency, variety of specifications, less equipment, but the general strength is lower than seamless steel pipe. Since the 1930s, with the rapid development of continuous rolling production of high quality strip steel and the progress of welding and inspection technology, the quality of welding seam has been continuously improved. Welded steel pipe is divided into straight welded pipe and spiral welded pipe according to the form of welding seam.

The blank used for welding steel pipe is steel plate or strip steel, which can be divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welding pipe due to different welding processes. Due to the different welding forms, it is divided into two types: straight welded pipe and spiral welded pipe. Because of its end shape is divided into circular welded pipe and shaped (square, flat, etc.) welded pipe. The welded pipes are divided into the following varieties due to their different materials and USES:

GB/ t3091-1993 (galvanized welded steel pipe for low-pressure fluid transport). Mainly used for water, gas, air, oil and heating hot water or steam, such as the general lower pressure fluid and other purposes. Its representative material is Q235A grade steel.

GB/ t3092-1993 (galvanized welded steel pipe for low-pressure fluid transport). Mainly used for water, gas, air, oil and heating hot water or steam, such as the general lower pressure fluid and other purposes. Its representative material is: Q235A grade steel.

Construction Welded Steel Pipe

GB/ t14291-1992 (welded steel pipe for fluid transport in mines). It is mainly used for straight seam welding steel pipe for mine pressure wind, drainage and shaft gas discharge. Its representative material Q235A, B grade steel. Large diameter electric welded steel pipe for low pressure fluid transport. Mainly used for conveying low pressure fluid such as water, sewage, gas, air, heating steam and other USES. Its representative material is Q235A grade steel.

(welded stainless steel pipe for mechanical construction). Mainly used for machinery, automobile, bicycle, furniture, hotel and restaurant decoration and other mechanical parts and structures. Its representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.

GB/ t12771-1991 (welded stainless steel pipe for fluid transport). Mainly used for conveying low pressure corrosive medium. The representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.

Direct seam welded pipe production process is simple, high production efficiency, low cost, rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. The welded pipe with larger diameter can be produced with narrow blank, and the welded pipe with different diameter can also be produced with the same width of blank. However, compared with the same length of straight seam pipe, the weld length increases by 30~100%, and the production speed is lower.

Therefore, the smaller diameter welded pipe mostly adopts straight seam welding, while the larger diameter welded pipe mostly adopts spiral welding.

Classification of welded steel pipes

According to the production method, the welded steel pipes can be divided into two categories: seamless steel pipes and welded steel pipes.

1. Seamless steel pipe can be divided into: hot rolled seamless pipe, cold drawn pipe, precision steel pipe, hot expanding pipe, cold spinning pipe and extrusion pipe, etc. Seamless steel tube with high quality carbon steel or alloy steel, hot rolling, cold rolling (pull).

2. The welded steel pipes are divided into furnace welded pipes, electric welded pipes (resistance welded pipes) and automatic arc welded pipes due to different welding processes. The welded pipes are divided into straight welded pipes and spiral welded pipes due to different welding forms. Welded steel pipe is made of tubular steel plate welded to seam or spiral seam. In terms of manufacturing method, it is divided into welded steel pipe for low-pressure fluid transportation, spiral welded steel pipe, direct welded steel pipe and electric welded pipe. Seamless steel pipe can be used for all kinds of liquid and gas pipelines. Welding pipes can be used for water pipes, gas pipes, heating pipes, etc.

According to the material classification: steel pipe according to the material (that is, steel) can be divided into: carbon pipe and alloy pipe, stainless steel pipe. Carbon pipe can be divided into ordinary carbon steel pipe and high quality carbon structure pipe. Alloy pipe can be divided into: low alloy pipe, alloy structure pipe, high alloy pipe, high strength pipe. Bearing pipe, heat and acid resistant pipe, precision alloy (such as cutting alloy) pipe and high temperature alloy pipe.

According to the type of connection: steel pipe according to the type of pipe end connection can be divided into: light pipe (pipe end without thread) and thread (pipe end with thread). Car silk tube is divided into: ordinary car silk tube and tube end thickening car silk tube. Thickening thread can also be divided into: outside the thickening (with external thread), inside the thickening (with internal thread) and inside and outside the thickening (with internal and external thread) and so on. If the thread type can also be divided into: ordinary cylindrical or conical thread and special thread, etc. In addition, according to customer needs, the car wire tube is generally equipped with pipe connector delivery.

According to the coating characteristics classification: steel tube according to the surface coating characteristics can be divided into: clarinet (not coated) and coated pipe. The coating tube has Galvanized Steel Pipe, aluminum tube, chrome tube, aluminized tube and other alloy layer pipe. Coating tube has outer coating tube, internal coating tube, internal and external coating tube. Commonly used coatings are plastics, epoxy resin, coal tar epoxy resin and various glass - based coatings.

Galvanized Steel Pipe

By use:

1. Use pipes. Such as: water, gas pipe, steam pipe seamless pipe, oil transport pipe, oil and gas trunk pipe. Agricultural irrigation faucet with pipe and sprinkler irrigation pipe.

2. Pipes for thermal equipment. Such as the general boiler with the boiling water pipe, superheated steam pipe, locomotive boiler with the heat pipe, large smoke pipe, small smoke pipe, arch brick pipe and high temperature and high pressure boiler pipe.

3. Pipe for mechanical industry. If aviation structure tube (round tube, elliptic tube, flat elliptic tube), automobile half axle tube, axle tube, automobile tractor structure tube, tractor oil cooler with tube, agricultural machinery with Square & Rectangular Pipe, transformer with tube and bearing with tube.

4. Petroleum geological drilling pipe. Such as: oil drilling pipe, oil drill pipe (kelly and hexagonal drill pipe), drilling straight, oil tubing, oil casing and various pipe joints, geological drilling pipe (core pipe, casing, active drill pipe, drilling straight, press hoop and pin joint, etc.).

5. Pipe for chemical industry. Such as: petroleum cracking pipe, chemical equipment heat exchangers and pipelines for pipe, rust and acid resistance pipe, chemical fertilizer with high pressure pipe and transport chemical medium pipe.

6. Other departments use pipes. Such as: container tube (high pressure gas cylinder tube and general container tube), instrument tube, hand case tube, needle and medical equipment tube. Classification by section shape, etc.