Large Diameter SSAW Steel Pipe Supplier & Factory in China - High Quality Spiral 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
SSAW spiral welded pipes are available in multiple material grades to suit various application needs:
- Q235B (ASTM A36 / S235JR / St37.2 equivalent)
- Q345B (S355JR / St52.3 equivalent)
- 16Mn, 20#, 40#, 60#
Grade B, X42, X46, X52, X60, X65, X70, X80
Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb
| Parameter | Specification |
|---|---|
| Outside Diameter | 219mm – 3000mm |
| Wall Thickness | 5mm – 22mm (SCH40, SCH80, SCH160) |
| Length | 5.8m / 6m / 12m or customized |
Manufacturing Standards
SSAW pipes are produced in accordance with internationally recognized 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
Other applicable standards may be specified depending on the intended application and regional requirements.
Surface Coating
SSAW spiral welded pipes can be supplied with various surface coatings to meet different environmental and application requirements:
- Three-layer system consisting of fusion-bonded epoxy primer, adhesive layer, and polyethylene topcoat
- Provides excellent corrosion resistance
- Ideal for pipelines installed in harsh environments
- Thermosetting epoxy powder fused to the pipe surface
- Offers good chemical resistance
- Suitable for both above-ground and underground applications
- Pipe immersed in a bath of molten zinc
- Forms a metallurgical bond with the steel substrate
- Creates a durable, corrosion-resistant zinc coating
- Provides excellent rust protection for both interior and exterior surfaces
Quality Control
SSAW spiral welded pipes undergo rigorous inspection procedures to ensure compliance with international standards:
Each pipe is verified for outer diameter, wall thickness, straightness, and length accuracy against specified requirements.
Samples are tested for tensile strength, yield strength, elongation percentage, and impact toughness to confirm material properties meet applicable standards.
Scans the weld seam to detect internal defects such as lack of fusion or cracks.
Every pipe is pressure-tested to verify integrity and ensure leak-free performance under operating conditions.
Packaging and Delivery
- Pipes are bundled in hexagonal seaworthy packs
- Secured with steel strips for stability during transport
- Each bundle equipped with two nylon slings for easy handling and loading
Typically within 30 days after order confirmation, depending on quantity and specifications.
Applications
SSAW spiral welded pipes are widely used across various industries due to their versatility, strength, and cost-effectiveness:
Extensively employed in long-distance pipelines for transporting crude oil, natural gas, and other petroleum products. The spiral weld construction provides excellent pressure resistance and structural integrity for demanding energy sector applications.
Ideal for water transmission and distribution systems, including municipal water supply, raw water pipelines, and irrigation projects. Corrosion-resistant coatings ensure long service life in water environments.
- Bridge construction
- Building frameworks
- Foundation piling
- Port and dock facilities
- Highway and railway structures
Suitable for various industrial settings such as power plant cooling water systems, mining slurry transportation, and process piping in chemical and petrochemical facilities.