Spiral SAW Pipe

Spiral SAW Pipe(full name Spiral Submerged Arc Welded Pipe,also abbreviated as SSAW Pipe or HSAW Pipe)is a large-diameter steel pipe product formed by helically rolling hot-rolled steel strips and adopting double-sided submerged arc welding technology.It is one of the most widely used pipe types in long-distance fluid transmission and infrastructure engineering.

1.Manufacturing Process

Raw Material Preparation:High-quality hot-rolled steel coils(carbon steel or low-alloy high-strength steel)are used as raw materials,which undergo strict physical and chemical testing,uncoiling,leveling,and trimming before production.

Spiral Forming:The steel strip is continuously bent into a cylindrical tube blank at a specific forming angle(adjustable)through a forming mill.

Double-sided Submerged Arc Welding:Internal and external welding are simultaneously carried out under the protection of welding flux.The weld seam presents a continuous spiral shape,ensuring high strength and dense quality.

Testing&Finishing:The finished pipe undergoes hydrostatic testing,ultrasonic testing,radiographic testing,etc.It is then cut to fixed length,beveled,and optionally coated with anti-corrosion layers.

2.Core Advantages

Large-diameter Capability:Can produce pipes with an outer diameter of 219mm–4064mm(8"–160")using narrow steel strips,which cannot be achieved by straight-seam pipes.

High Structural Strength:The spiral weld evenly distributes stress,giving the pipe superior circumferential strength,anti-deformation ability,and seismic performance.

Flexible Production:The same width of steel strip can produce pipes of different diameters,with high material utilization and strong specification adaptability.

Cost Efficiency:Suitable for mass production of medium-to-long pipe sections(single length up to 12–18m),reducing field welding joints and construction costs.

Wide Pressure Range:Meets medium-to-high pressure transmission requirements,compliant with multiple international standards.

3.Main Specifications

Outer Diameter:DN200–DN3600(219mm–3620mm)

Wall Thickness:3.2mm–40mm

Standard Length:6m,12m(customizable up to 18m)

Steel Grades:Q235B,Q355B,API 5L Gr.B,X42–X70,L245–L485,S235JRH,S355J2H

Standards:API 5L(PSL1/PSL2),GB/T 9711,ASTM A252,EN 10219,AWWA C200

4.Primary Applications

Oil&Gas Industry:Long-distance transmission pipelines for crude oil,natural gas,and petroleum products.

Municipal Engineering:Urban water supply,drainage,sewage disposal,and heat/steam transmission.

Structural&Construction:Bridge pile foundations,high-rise building structural columns,wharf and port supports.

Industrial&Mining:Chemical fluid pipelines,mine slurry/water delivery,power plant cooling water systems.

Water Conservancy:Large-scale water diversion projects,flood control,and irrigation pipe networks.