Spiral steel pipes for infrastructure pipelines, also known as spiral pipes or spiral welded pipes, are industrial steel pipes made by rolling steel strips into billets at a certain helix angle (forming angle), and then welding the pipe seams together. Their specifications are expressed as outer diameter * wall thickness. There are two types of welding: single-sided welding and double-sided welding. The pipe body must ensure that the hydrostatic test, tensile strength, and cold bending performance of the weld meet the requirements.

Material composition

The main materials for spiral steel pipes are carbon steel and alloy steel. Carbon steel typically has a carbon content between 0.12% and 2.0%, and has good mechanical properties and processability; Alloy steel is made by adding elements such as chromium, nickel, and molybdenum to carbon steel, which can improve the strength, corrosion resistance, and wear resistance of the steel to adapt to specific working environments. Carbon steel spiral steel pipes are suitable for general transportation and structural applications, while alloy steel spiral steel pipes are suitable for transportation and process requirements in special environments.

Pipe installation

Weld or connect according to design requirements to ensure the quality and sealing of the pipeline.

Anti corrosion and insulation treatment

During the construction process, anti-corrosion and insulation treatment should be carried out on the pipeline to extend its service life.

advantage

Production aspect

Narrow strip steel can be used to produce welded pipes with larger diameters, and the same width of strip steel can also be used to produce welded pipes with different diameters. There is greater flexibility in the size specifications of diameter and wall thickness, especially in the production of high-grade thick walled pipes, especially in the production of small and medium-sized thick walled pipes, which has advantages that other processes do not have. Adopting advanced automatic double-sided submerged arc welding technology, the welding position is suitable, and defects such as misalignment, welding deviation, and incomplete penetration are not easy to occur, making it easy to control the welding quality. Conduct 100% quality inspection on steel pipes, and the production line equipment has networking capabilities with computer data acquisition systems, enabling real-time data transmission and technical parameter analysis.

Performance aspect

The strength is generally higher than that of straight seam welded pipes, and the crack resistance of the material is better than that of straight seam steel pipes. The production of spiral welded pipes adopts online continuous detection method to ensure the welding quality of welds, which is conducive to monitoring welding defects, stabilizing welding quality, and ensuring welding grade.

application area 

Construction field

The drainage system commonly used in high-rise buildings discharges wastewater and rainwater. Due to its compact structure, high strength, and ability to withstand large amounts of water pressure and gravity loads, it ensures the stability and safety of the drainage system. It can also be used as a pile foundation material in pile foundation engineering, for supporting and fixing underground pipelines, and as a support material for building structures, building brackets and scaffolding for large buildings.

Transportation field

Widely used in oil and gas transportation pipelines, water supply pipelines, and thermal pipelines. It has good sealing and pressure resistance, and can safely and efficiently transport various liquids and gases. It can also be connected and extended as needed to adapt to different transportation distances and shape requirements.

Structural engineering field

Commonly used for supporting and reinforcing bridges, tunnels, docks, and large facilities, its high strength and stability enable it to effectively share loads and provide stable support.

Municipal engineering field

Used for municipal drainage networks, sewage treatment facilities, and urban water supply systems, it has the characteristics of corrosion resistance and strong durability, and can operate stably for a long time, ensuring the normal operation and convenience of urban life.

Other areas

It can also be used to manufacture mechanical equipment, transmission towers, high-voltage boilers, etc., and has important application value in industries such as metallurgy, mining, ports, pharmaceuticals, papermaking, and hydropower stations.