Surface Treatment Requirements for Spiral Pipes from Manufacturers

　　 Spiral pipe manufacturer It is stated that spiral welded pipes are primarily used in municipal water supply projects, the petrochemical and chemical industries, the power industry, agricultural irrigation, and urban construction, and are among the 20 key product categories prioritized for development in China. Structural steel pipes are mainly manufactured from coiled strip steel as raw material; they are formed through room‑temperature extrusion and joined by an automated double‑wire, double‑sided submerged‑arc welding process to produce spiral‑welded pipes. In the production of spiral‑shaped steel pipes, the strip steel is fed into a pipe‑making mill, where it passes through multiple sets of rollers that progressively roll and curl it into a circular tube blank with an open seam. By adjusting the downward pressure of the extrusion rollers, the gap between weld beads is maintained within 1–3 mm, ensuring that both ends of the weld joint are flush.

　　A dual-axis diameter gauge with an adjustable measurement range, this equipment can continuously mill seamless steel; it is suitable for rolling seamless steel piles, straight‑welded pipes, and spiral‑welded pipes. It can be installed directly on the production line for online diameter measurement, or mounted on nondestructive testing lines and inspection lines to measure the outer diameter of finished pipes.

　　The helical tube manufacturer states that the device’s measurement range can be adjusted on both sides of the two sets, with automatic adjustment via a servo motor; once set, no further calibration is required to ensure measurement accuracy. The equipment can be equipped with an external recirculating cooling system, a duckbill‑type side‑blowing dust‑removal control system, an embedded intelligent module, a host‑computer control system, and an external LED display, and it can simultaneously transmit data to a network database. Users can view data in real time via mobile devices or computers, depending on application requirements. Additionally, the lower section of the device can be fitted with an automated height‑adjustable lifting platform to automatically regulate the height of the measurement center.

　　Surface treatment requirements for spiral pipes: When applying coatings to metal surfaces, sandblasting and shot blasting must achieve the national standard SA 2.12 for rust removal. The surface must be clean, free of oil, grease, and dust, and coating application should be completed within 4 hours. Mixing ratio: A:B = 3:1 (by weight). Theoretical coating rate: For a dry film thickness of 80–100 μm, the consumption is kg/m². Diluent usage: If the coating is excessively thick, a suitable specialized diluent may be added at a dosage of 3%–10%.

　　The spiral pipe manufacturer states that after the final topcoat has been applied, the pipes must undergo natural curing for seven days before being put into service. If the ambient temperature falls below 10°C, the curing period should be appropriately extended. We offer Q235B spiral pipes specifically for water applications, anti-corrosion spiral pipes for natural gas pipelines, and specialized anti-corrosion spiral pipes for potable water systems. The Canghai Steel Spiral Pipe Factory in Nanning, Guangxi, maintains a substantial inventory of pipe products year-round. In China, spiral pipes were initially used in municipal water supply projects, the petrochemical and chemical industries, the power sector, agricultural irrigation, and urban construction—serving as conduits for liquid transport (water supply and drainage), gas transport (coal gas, steam, and liquefied petroleum gas), and structural applications (piling tubes, bridge supports, and structural components for docks, roads, and building projects). From a manufacturing standpoint, spiral pipes are also classified as welded pipes.

　　Spiral pipe manufacturers note that spiral pipes generally offer higher strength than straight-seam welded pipes. They can be produced using narrow steel strips to manufacture larger-diameter pipes, or the same‑width strips can be used to make welded pipes of varying diameters. However, compared with straight‑seam pipes of the same length, the weld seam length increases by 30% to 100%, and production speeds tend to be lower. For more information on spiral pipes and related industry updates, stay tuned to Canghai Steel.