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Spiral steel pipes for urban engineering equipment pipelines are a type of steel pipe made from strip steel coils and manufactured through spiral forming and double-sided submerged arc welding processes. They have the characteristics of high strength, corrosion resistance, and convenient construction, and are widely used in municipal infrastructure fields such as urban water supply, sewage discharge, and thermal transportation.
keyword Urban engineering equipment pipeline steel pipe Category Scene photos Related products Get a quoteDefinition and core characteristics of spiral steel pipes for urban engineering installation pipelines
Spiral steel pipes for urban engineering equipment pipelines are a type of steel pipe made from strip steel coils and manufactured through spiral forming and double-sided submerged arc welding processes. They have the characteristics of high strength, corrosion resistance, and convenient construction, and are widely used in municipal infrastructure fields such as urban water supply, sewage discharge, and thermal transportation. Its core function is to ensure the safe operation and long-term stability of the urban pipeline network system.
Technical characteristics and manufacturing processes
Materials and processes
Raw material selection: Q235B, Q345B and other low carbon steel or low alloy steel are used to meet the strength requirements of different engineering scenarios (such as water supply pipes requiring a pressure of ≥ 1.6MPa and sewage pipes requiring acid and alkali corrosion resistance).
Forming and Welding: The strip steel is spiral formed by a rolling machine, and the inner and outer double-sided submerged arc welding (such as automatic double wire welding technology) ensures the strength of the weld seam. The weld seam gap is strictly controlled within 1-3mm.
Corrosion prevention and surface treatment
Anti corrosion process: For underground humid environments, hot-dip galvanizing, epoxy coal tar or 3PE (epoxy powder+adhesive+polyethylene) anti-corrosion coating is used to enhance the resistance to soil and chemical media corrosion.
Surface pretreatment: sandblasting for rust removal, acid washing for cleaning to enhance coating adhesion and extend pipeline life to 30-50 years.
Performance advantages
Pressure bearing capacity: The wall thickness range is 6-25mm, with a maximum pressure bearing capacity of 2.5MPa (such as a DN1200 water supply main pipe with a wall thickness of 10mm).
Construction convenience: Spiral welds disperse stress, can be bent and laid, reducing on-site welding joints (such as reducing joints by 30% in a certain project).
Economy: Producing large-diameter pipes (such as DN2500) with narrow strip steel reduces material costs by 15% -20%.
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