Welded Steel Pipe | ERW / LSAW / SSAW Carbon Welded Pipe Supplier
Welded steel pipe covers three mainstream types: ERW, LSAW and SSAW. Manufactured via high-frequency resistance welding or submerged arc welding. ERW for small bore, LSAW for high-pressure large bore, SSAW for ultra-large diameter pipeline. We supply bare & galvanized welded pipes, offer custom processing for water, gas, structural and energy transportation projects.
Available Grades
- ASTM A53 Grade B Universal Grade: Versatile carbon welded grade with balanced strength and ductility, applicable for general water supply, fire protection and low-pressure structural piping worldwide.
- Q235B / S235JR ERW Structural Grade: Cost-effective low-carbon grade with great bending performance, mainly made into handrails, fence pipes and building auxiliary structural tubes.
- Q355B / S355JR High-strength Grade: Low-alloy upgraded grade with higher pressure resistance, suitable for heavy-load building support and medium-pressure industrial fluid pipelines.
- API 5L X42-X60 LSAW High-pressure Grade: Longitudinal submerged arc welded grade with compact straight weld, stable impact resistance, designed for urban high-pressure natural gas trunk pipelines.
- API 5L Gr.B SSAW Spiral Welded Grade: Spiral submerged arc welded grade with stress-dispersed weld, perfect for ultra-large diameter buried oil, gas and cross-river long-distance pipelines.
- Hot Dipped Galvanized Welded Grade: Anti-corrosion finished welded pipe with full zinc coating, adapted to coastal humid, outdoor buried and corrosive workshop piping scenarios.
Product Features
- Three Mature Welding Process Classification: ERW high-frequency straight weld for small-medium bore; LSAW submerged arc straight weld for high-pressure large bore; SSAW spiral weld for super-large bore engineering pipelines.
- Reliable Weld Seam Performance: Full automatic welding + post-weld heat treatment, no porosity or crack on weld seam, pass hydraulic pressure and ultrasonic test without leakage risk.
- Superior Secondary Processability: Support cutting, threading, grooving, flange welding and bending, compatible with global standard pipe fittings for fast on-site assembly.
- Dual Anti-corrosion Surface Option: Black anti-rust oil bare pipe for indoor dry use; hot dipped galvanized pipe for outdoor buried, seaside and corrosive working environments.
- Cost Graded Matching Design: ERW lowest cost, LSAW high cost high safety, SSAW economical large-bore option, meet projects with different budget and pressure standards.
- Strict Dimensional Consistency: Unified outer diameter, wall thickness tolerance and pipe roundness, perfectly matched with standard elbows, tees and connecting accessories.
Applications
- Municipal Water Supply & Drainage: ERW/SSAW welded pipes for urban buried domestic water delivery, sewage discharge and farmland long-distance irrigation pipeline network.
- Building Fire & Structure Works: ERW galvanized pipe for building fire sprinkler piping; all-type welded pipe for building support, handrail and embedded structural components.
- Oil & Natural Gas Transmission: LSAW for high-pressure urban gas pipeline; SSAW for long-distance crude oil, coal gas and cross-water buried energy trunk pipelines.
- Municipal Traffic Infrastructure: ERW pipe for road guardrail and fence; thick-wall SSAW/LSAW pipe for bridge load-bearing support and municipal drainage culvert piping.
- Industrial Factory Pipeline System: Medium-pressure LSAW pipe for factory circulating water, steam and industrial medium delivery; ERW pipe for workshop ventilation auxiliary piping.
- Offshore & Port Engineering: Galvanized LSAW welded pipe for port platform support, coastal water intake pipe, resisting seawater erosion and tidal impact.
Product Advantages (Customer Value)
- Graded Cost Control For Projects: Three process types cover low to high pressure demands, avoid over-specification material waste, effectively cut overall engineering procurement expenditure.
- Lower On-site Construction Cost: Standard fixed length, easy connection and machining, reduce on-site welding workload, shorten pipeline construction cycle and labor cost.
- Reduce Later Operation Maintenance: Qualified weld seam minimizes pipeline leakage failure; galvanized finish extends service life, reduce periodic anti-rust repair and pipeline replacement frequency.
- One-stop Full-bore Procurement: Integrate small-bore ERW, high-pressure LSAW, super-large SSAW pipe, simplify supplier management for general contractors and pipeline distributors.
- High Pass Rate For Project Acceptance: 100% online non-destructive weld inspection, stable batch mechanical property, pass third-party engineering inspection smoothly.
Technical Data Table
| Technical Item | ERW Welded Pipe | LSAW Welded Pipe | SSAW Welded Pipe |
| Material Density | 7.85 g/cm³ | 7.85 g/cm³ | 7.85 g/cm³ |
| Yield Strength | ≥235 MPa | ≥415 MPa | ≥355 MPa |
| Tensile Strength | 375–500 MPa | 565–750 MPa | 470–620 MPa |
| Elongation | ≥21% | ≥17% | ≥18% |
| Max Wall Thickness | 16mm | 50mm | 25mm |
| Outer Diameter Scope | 21.3mm – 610mm | 406mm – 3000mm | 219mm – 3500mm |
Why Choose Us
- Complete ERW/LSAW/SSAW Full Stock: Cover small to ultra-large diameter welded pipes, support mixed-type container loading, meet diversified pipeline order demands for distributors and contractors.
- Full Weld Nondestructive Testing: Conduct ultrasonic inspection, hydraulic pressure test and chemical composition test for every batch, guarantee weld safety for pressure pipeline projects.
- Full-cycle Custom Processing: Offer pipe grooving, threading, flange welding, anti-corrosion painting, galvanizing and fixed-length cutting, deliver ready-to-install finished pipes.
- Professional Pipe Selection Guidance: Free technical suggestion to choose cost-effective ERW/LSAW/SSAW pipe based on working pressure, medium and site environment.
Packaging & Shipping
- Standard Seaworthy Export Package: Small-bore ERW pipes bundled by steel strips; large-bore LSAW/SSAW pipes equipped with plastic end caps; wrapped with waterproof woven cloth for ocean moisture and collision protection.
- Standard Traceable Pipe Marking: Permanently print pipe type, grade, OD, wall thickness, heat number and batch logo on pipe surface for site receiving and quality traceability.
- Customized Special Packing: Custom anti-rust oil coating, outer brand logo printing, dedicated sealed packing for threaded, galvanized and high-pressure finished pipes.
- Diversified Delivery Cycle: Stock standard ERW pipes 3-6 working days delivery; customized LSAW/SSAW anti-corrosion pipes 10-16 working days production lead time.
FAQ
- Q: Core difference between ERW, LSAW and SSAW pipe?
A: ERW: small bore, low cost for low-pressure use; LSAW: straight weld, high pressure resistance for urban gas; SSAW: spiral weld, ultra-large bore for long-distance buried pipeline. - Q: Which welded pipe fits high-pressure natural gas project?
A: API 5L certified LSAW welded pipe is the first choice for high-pressure gas transmission, with better impact and weld stability than SSAW pipe. - Q: What surface treatment can you provide?
A: Black anti-rust oil, exterior anti-corrosion painting, hot dipped galvanized, epoxy coal tar coating optional for buried corrosive pipeline.
