China SSAW Steel Pipe Suppliers & Factory: Large Diameter Spiral Submerged Arc Welded Pipes
Product Overview
SSAW (Spiral Submerged Arc Welded) steel pipe is manufactured by continuously forming hot-rolled steel coils into a spiral shape and welding the seam using double-sided submerged arc welding technology. The spiral forming process allows large-diameter pipes to be produced from narrower steel strips by adjusting the forming angle—a key advantage over straight seam welding methods.
SSAW pipes are available in a wide range of sizes, typically from 219mm to over 3000mm in outer diameter, and are manufactured to international standards such as API 5L and ASTM A252. They are commonly used for oil and gas transmission, water pipelines, structural applications, and foundation piling projects.
Material Grades & Specifications
⚙ Carbon Steel Grades: Q235B (ASTM A36 / S235JR / St37.2 equivalent), Q345B (S355JR / St52.3 equivalent), 16Mn, 20#, 40#, 60#
⚙ API 5L Line Pipe Grades: Grade B, X42, X46, X52, X60, X65, X70, X80
⚙ Stainless Steel Grades: Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb
| Outside Diameter: | 219mm - 3000mm |
| Wall Thickness: | 5mm - 22mm (SCH40, SCH80, SCH160) |
| Length: | 5.8m / 6m / 12m or customized |
Manufacturing Standards
Specifies requirements for pipeline transportation systems in oil and gas industries. Available in PSL1 and PSL2 product specification levels.
Covers nominal wall cylindrical steel pipe piles. Used as permanent load-carrying members or shells for cast-in-place concrete piles.
Surface Coating
- 3LPE (3-Layer Polyethylene): Three-layer system (FBE primer, adhesive, PE topcoat) for excellent corrosion resistance in harsh environments.
- FBE (Fusion-Bonded Epoxy): Thermosetting epoxy powder for chemical resistance in above-ground and underground applications.
- Hot-Dip Galvanizing: Molten zinc bath providing a metallurgical bond and durable rust protection for interior and exterior surfaces.
Quality Control & Inspection
Dimensional Inspection: Verification of outer diameter, wall thickness, straightness, and length accuracy.
Mechanical Testing: Tensile strength, yield strength, elongation, and impact toughness tests.
Non-Destructive Testing (NDT):
- Ultrasonic Testing (UT): Scans weld seams for internal defects.
- Hydrostatic Testing: Pressure-tested to ensure leak-free performance under operating conditions.
Packaging and Delivery
Pipes are bundled in hexagonal seaworthy packs, secured with steel strips, and equipped with two nylon slings for easy handling.
Typically within 30 days after order confirmation, depending on quantity and specifications.
Applications
Oil and Gas Transportation: High pressure resistance for long-distance crude oil and natural gas pipelines.
Water Distribution: Durable construction for municipal supply, raw water, and irrigation projects.
Structural Applications: Used in bridge construction, building frameworks, foundation piling, and port facilities.
Industrial Applications: Cooling water systems, mining slurry transportation, and process piping.
Frequently Asked Questions
A: SSAW pipes can be produced in much larger diameters using narrower steel strips by adjusting the forming angle, making them more cost-effective for large-scale projects.
A: We offer SSAW pipes with an outside diameter ranging from 219mm up to over 3000mm.
A: Common coatings include 3LPE (3-Layer Polyethylene), FBE (Fusion-Bonded Epoxy), and Hot-Dip Galvanizing to suit different environmental needs.
A: Yes, SSAW pipes manufactured to ASTM A252 standards are widely used as load-carrying members for bridge and building foundations.
A: Every pipe undergoes Non-Destructive Testing (NDT), including Ultrasonic Testing (UT) of the weld seam and Hydrostatic Testing to ensure integrity.
A: Delivery usually occurs within 30 days after order confirmation, though this may vary based on the specific quantity and customization requirements.