We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
High quality piping products from approved manufacturers.
In order to continuously improve our offerings to our clients, we have consistently improved and upgraded our manufacturing facility and can hence offer material with stringent requirements.
Over the years, Super Steel Manufacturing Co.,Ltd(SMC) has developed an enviable reputation for project management for the Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical and other heavy industries.
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Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Spiral welded steel pipes, also known as Spiral Submerged Arc Welded (SSAW) pipes, are manufactured from steel coils formed into a spiral shape and welded using double-sided submerged arc welding technology. These pipes are widely used in the transportation of oil and gas, water supply systems, structural applications, and other engineering projects. Their high production efficiency, dimensional flexibility, and adaptability to diverse requirements make them a preferred choice in various industries. Below are the detailed technical specifications for spiral welded steel pipes.
1. Dimensions
Outer Diameter (OD): Typically ranges from 219 mm to 3048 mm (8 inches to 120 inches).
Wall Thickness (WT): Commonly varies between 3 mm to 25 mm (0.12 inches to 1 inch).
Length: Customizable, often supplied in 6 m, 12 m, or double random lengths (up to 18 m). Longer pipes may be available with on-site welding.
2. Material Standards
Common material grades:
API 5L: For petroleum and natural gas industries (Grades A, B, X42 to X80).
ASTM A252: For piling applications.
ISO 3183: For pipeline systems.
EN 10219: For structural applications.
Steel type:
Carbon steel (low alloy) or mild steel with high weldability.
Variations include specific grades like Q235, Q345, and S355.
3. Production Standards
Key international standards:
API 5L PSL1/PSL2 (Pipeline steel pipe).
ASTM A53/A106 (General-purpose steel pipes).
ISO 3183 (Pipeline transportation systems).
GB/T 9711 (Chinese standard for pipelines).
4. Manufacturing Process
Spiral Submerged Arc Welding (SSAW):
Steel coil is spirally formed and welded with submerged arc welding technology.
Features both internal and external weld seams for strength.
5. Pressure Ratings
Pressure-bearing capability depends on wall thickness, diameter, and grade.
Low-pressure pipes: For water or general fluid transportation.
High-pressure pipes: For oil and gas pipelines, adhering to API standards.
6. Coatings and Surface Treatments
Anti-corrosion Coatings:
3LPE (Three-layer Polyethylene): Ideal for corrosion resistance.
Epoxy coatings: For internal and external surfaces.
Coal tar enamel or bitumen: For cost-effective corrosion protection.
Galvanized Coating: For specific applications requiring rust prevention.
Bare Pipe: Can be delivered untreated based on requirements.
7. Applications
Oil and Gas Transmission: Pipeline systems under high pressure.
Water Supply Systems: Potable and irrigation water pipelines.
Structural Applications: Piling, bridge construction, and load-bearing.
Industrial Use: Slurry pipelines, dredging pipes.
8. Weld Testing and Quality Assurance
Non-destructive Testing (NDT):
Ultrasonic testing for weld seam inspection.
X-ray inspection of critical weld areas.
Hydrostatic Testing: Ensures pipes withstand the designated pressure.
Dimensional Inspections: Checks for compliance with specified tolerances.
Mechanical Property Tests: Verifies tensile strength, yield strength, and elongation.
9. Tolerances
OD Tolerance: ±1% or as specified by standards.
WT Tolerance: ±10% of specified thickness.
Straightness: Deviations within acceptable limits.
Ends: Beveled (for welding) or plain (on request).
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