What is spiral steel pipe?

Spiral steel pipeis made of Steel Coil, extruded at room temperature, and then double-wire and double-sided submerged arc welding technology.

Spiral steel pipe, also known as spiral or spiral spiral Steel Pipe, is a low-carbon steel or low-alloy structural steel strip rolled into a tube at a certain spiral angle (called forming angle). The tube is made of welded joints and can be produced with narrow strips and large diameter tubes.

During the forming process of spiral welded steel pipe, the steel plate is deformed evenly, the residual stress is light, and there are no scratches on the surface. Spiral steel pipe has more flexible thickness and diameter, especially when manufacturing high-grade thick pipes with small and medium apertures, these technologies have unparalleled advantages in meeting your needs.

Spiral steel pipe production process

1. Unwinding plate probe: After entering the unwinding plate production line, the first full-plate ultrasonic flaw detection is carried out.

2. Leveling milling: The flat steel anvil machine makes the original curling, and then the double-sided steel milling is carried out through the milling machine to meet the requirements of plate width, plate edge parallelism and groove shape.

3. Shearing: Curl the steel plate production line into a tube along the outer edge.

4. Butt cutting: Double-sided submerged arc welding uses advanced technology for pre-welding, internal welding and external welding. Ion feet are cut into welded spiral tubes of standard length for use, etc.

5. Visual inspection: Some basic parameters are checked by professional technicians.

6. Ultrasonic flaw detection: 100% detection of internal and external welds and parent materials on both sides of the welds.

7. X-ray detection: 100% X-ray industrial television inspection image processing system for internal and external welds to ensure the use of detection sensitivity.

8. Pressure test: Spiral steel pipe water pressure testing machine tests each pipe to ensure that the test pressure pipe meets the required standards.

9. Chamfered flat head: After the spiral steel pipe is inspected, the pipe end is processed to meet the pipe end groove size

10. Final inspection: Ultrasonic and X-ray re-detection and magnetic particle flaw detection of the spiral steel pipe end to check whether there are problems and defects at the welded pipe end.

11. Oiling mark: Spiral steel pipes are oiled after passing through to prevent corrosion, and are marked according to user requirements.

Classification of spiral steel pipes

1. Low-pressure fluid pipes are welded steel pipes

Generally called clarinet pipes. Welded steel pipes are used to transport general low-pressure steam heating fluids such as water, gas, gas, and oil. The pipe wall thickness is divided into ordinary steel and thicker steel; the pipe edge is formed into a form without steel pipe and pipe steel. The pipe specification uses the nominal diameter (mm), and the nominal diameter is an approximate value of the diameter. Traditionally used in inches. In addition to being used to transport fluids, low-pressure fluid welded steel pipes also use a large number of galvanized welded low-pressure fluid original steel pipes.

2. Low-pressure fluid galvanized welded steel pipes, also known as galvanized welded steel pipes, commonly known as white pipes. Hot-dip galvanized welded steel pipes are used to transport general low-pressure fluids such as water, gas, air, oil and steam heating, warm water, or other purposes. The pipe wall thickness is divided into ordinary galvanized steel pipe and thick galvanized steel pipe; the pipe end is divided into unthreaded galvanized steel pipe and threaded galvanized steel.

The form of the pipe. The pipe specification is the nominal diameter, and the nominal diameter is the approximate value of the diameter. Traditionally, it is usually expressed in inches, such as 11/2, etc.

3. Ordinary carbon steel wire casing is the top steel wire used to protect electrical installation projects in industrial and civil buildings and installation machinery and equipment.

4. Straight seam welded steel pipe is parallel to straight seam welded pipe. It is usually divided into metric welded steel pipe, welded pipe, transformer cooling pipe, etc.

5. Pressurized liquid conveying spiral submerged arc welded pipe is made of hot-rolled steel strip coil as the pipe material, often in a warm spiral shape, and uses double-sided submerged arc welding for spiral seam steel pressure fluid conveying. Strong pressure steel, good welding performance, through various rigorous scientific inspections and test tests, safe and reliable to use. Large pipe diameter, high conveying efficiency, can save investment in laying pipelines. Mainly used for oil pipelines and natural gas.

6. High-frequency spiral welded steel pipes for pressure transmission fluids are hot-rolled steel strip coils. They are often heated spirally shaped and overlapped by high-frequency welding. High-frequency spiral seams are welded steel pipes for pressure fluid transportation. Strong pressure steel and plastic are easy to weld and machine; they have passed various rigorous and scientific inspections and tests, are safe and reliable, have large pipe diameters, high transportation efficiency, and save investment in laying pipelines. They are mainly used for laying pipelines for transporting oil, natural gas, etc.

7. General low-pressure infusion spiral submerged arc welded pipes are hot-rolled steel strip coils as pipes, often heated spirally shaped, and are made of double-sided or single-sided automatic submerged arc welding to form water, gas, air and steam low-pressure liquid transmission surface acoustic wave tubes.

8. General low-pressure liquid delivery spiral seam high-frequency welded steel pipes are hot-rolled steel strip coils as pipes, often heated spirally shaped, and are made of high-frequency overlap welding to form general low-pressure liquid delivery spiral seam high-frequency welded steel pipes.

9. Spiral welded steel pipe piles are made of hot-rolled steel strip coils, often in a warm spiral shape, and are made of steel pipes for infrastructure piles such as civil engineering structures, piers, bridges, etc. by double-sided submerged arc welding or high-frequency welding.

Characteristics of spiral steel pipes:

The longitudinal production process is simple, efficient, low cost, and rapid development. Spiral welding is generally higher than that in the longitudinal direction, which can reduce the billet to produce large-diameter pipes, and can also use the same width of billets to produce pipes of different diameters. However, compared with the straight seam pipe of the same length, the weld length is 30% to 100%, and the productivity is lower. Therefore, small-diameter pipes are mostly straight seam welded, and large-diameter spiral welded pipes are mostly straight seam welded.

Application of spiral welded pipes

Mainly used in tap water engineering, petrochemicals, chemicals, electricity, agricultural irrigation and urban construction. It is one of the twenty key products developed in China.
Liquid transportation purposes: water supply, drainage, sewage treatment engineering, mud transportation, marine water transportation.
For gas transportation: gas, steam, liquefied petroleum gas.
Structural use: as piling pipe, as bridge; piers, roads, building structures, marine piling pipe. Spiral welded pipes undergo rigorous physical and chemical tests before being put into use.
Spiral seam submerged arc welded pipes for pressure fluid transportation are mainly used for pipelines for transporting oil and natural gas. The steel pipe has strong pressure bearing capacity, good plasticity, and is easy to weld and process. In general, spiral submerged arc welded steel pipes for low-pressure fluid transportation use double-sided automatic submerged arc welding or single-sided welding methods, and are used for submerged arc welded steel pipes for transporting low-pressure fluids such as water, gas, air, and steam.