Welded Steel Pipes – Core Solutions for Fluid Conveyance & Structural Support
We offer a full range of welded steel pipe products, including straight seam welded pipe (ERW) and spiral welded pipe (SSAW). Our products are widely used in oil and gas transportation, construction engineering, municipal water supply, machinery manufacturing, and bridge construction. Welded steel pipes are made by rolling steel plates or strips into shapes and then welding them together. They have advantages such as simple production processes, high production efficiency, and a wide variety of specifications. We strictly adhere to international standards in our production and support customized sizes and advanced processing services.
Product Range, Sections & Specifications
- Welded pipes for fluid conveyance are used to transport fluid media such as water, oil, and gas, and are the preferred product for oil and gas, and municipal engineering projects.
Standards:
API Spec 5L: Line Pipe Specification, covering steel grades GR.B, X42, X46, X52, X56, X60, X65, X70, X80, etc.
ASTM A53 / A106: Carbon Steel Seamless and Welded Pipe Standards
GB/T 3091-2008: Welded Steel Pipes for Low-Pressure Fluid Transportation
GB/T 9711: Steel Pipes for Oil and Gas Industry Transportation
JIS G3454 / G3452: Carbon Steel Pipes for Pressure/General Purpose Piping
Main Materials/Grades:
Carbon Steel Series: Q195A, Q215A, Q235A/B/C, Q355B
Line Steel Series: L245, L290, L360, L415, X42, X52, X60, X65, X70, X80 Stainless Steel Series: TP304, TP304L, TP316L, 0Cr13, 1Cr17, 00Cr19Ni11
Size Range:
Straight seam welded pipe (ERW): Outer diameter Φ21.3mm – 630mm, wall thickness 2.11mm – 19.1mm
Spiral welded pipe (SSAW): Outer diameter Φ219mm – 2620mm, wall thickness 6mm – 50mm
- Straight Seam Welded Pipe (ERW): Outer Diameter Φ21.3mm – 630mm, Wall Thickness 2.11mm – 19.1mm
Spiral Welded Pipe (SSAW): Outer Diameter Φ219mm – 2620mm, Wall Thickness 6mm – 50mm
Structural Welded Pipes & Tubes: Used in load-bearing structures such as building structures, machinery manufacturing, scaffolding, and bridges.
Standards:
ASTM A500: Cold-formed round and shaped welded tubes for structural applications
STM A252: Steel pipes for piling
EN 10219: Cold-formed welded hollow sections for structural applications
JIS G3444: Carbon steel tubes for general structural applications
GB/T 6725 / GB/T 6728: Cold-formed hollow sections for structural applications
Main Materials:
Carbon steel series: Q235B, Q355B, S235JR, S275JR, S355JR
ASTM: ASTM A36, A53 Gr.B, A500 Gr.B/C
JIS: SS330, SS440, SS490, STKR400, STKR490
Size Range:
Round tube: Outer diameter Φ21.3mm – 630mm, wall thickness 2.0mm – 20mm
Scaffolding tubes: Φ48.3×3.2mm / 4.0mm (EN 39 standard)
- Oil well tubing / Oil Country Tubular Goods (OCTG) Casing and tubing for oil and gas wells.
Standards:
API Spec 5CT: Casing and Tubing Specification
Main Materials/Grades:
API Series: H40, J55, K55, N80, L80, P110
Non-API Series: Products with special properties such as high crush resistance and corrosion resistance can be developed according to customer requirements.
Size Range:
Outer Diameter: Φ48.3mm – 273.1mm, Wall Thickness: 2.77mm – 11.43mm
- Key Differentiators
✔ End-to-End Production Control, Reliable Weld Quality
We achieve end-to-end advantages from steelmaking and hot-rolled steel coils to pipe manufacturing. Utilizing advanced high-frequency resistance welding (HFW) and double-sided submerged arc welding (LSAW/SSAW) processes, coupled with online heat treatment technology, we ensure weld strength is comparable to the base material. For spiral welded pipes, double-sided submerged arc welding can be used to achieve an impact toughness of over 240J.
✔ High Geometric Dimensional Accuracy, Reduced On-Site Machining
Equipped with high-precision forming and sizing machines, product tolerances are strictly controlled within standard ranges. As a leading welded pipe manufacturer, we use an MES system to monitor 18 parameters in real time, including welding current and forming speed, ensuring product tolerances are controlled within ±0.05mm, meeting the requirements of precision equipment manufacturing.
✔ Diverse Material Selection, Adapting to Complex Working Conditions
Customized materials are available based on application scenarios:
* Oil & Gas: High-strength pipeline steel such as X70/X80, with full-size tensile testing.
* Building Structure: Q355B/SS400, passing seismic performance testing.
* Automotive Manufacturing: DP600/HSLA, dimensional tolerance ±0.1mm.
* Food & Pharmaceutical: 304/316L stainless steel, FDA certified, electropolished.
✔ Diverse Surface Treatments
Comprehensive surface treatment solutions are provided to meet different corrosion protection requirements:
* Hot-dip galvanizing: Zinc layer thickness up to 600g/m², excellent corrosion resistance.
* 3PE anti-corrosion: Three-layer polyethylene coating, suitable for buried pipelines.
* Fluorocarbon coating: Used for building curtain walls, weather resistance up to 30 years.
* Aluminizing: Welded pipes for automotive exhaust systems, temperature resistance up to 900℃.
- Quality Assurance
We have established a complete quality control system from raw materials to finished product delivery to ensure that every steel pipe meets international standards.
Four-fold Inspection System: Leading welded pipe manufacturers implement a four-fold inspection system: raw material spectral analysis → online eddy current testing → hydrostatic burst testing → third-party sampling inspection. Welded pipes for a nuclear power project underwent 48 tests, achieving a defect detection rate of 99.97%.
Online Non-destructive Testing:
Ultrasonic Testing: 100% inspection of internal and external welds and the base material on both sides of the weld.
X-ray Real-time Imaging: Image processing system ensures high detection sensitivity.
Eddy Current Testing: Online detection of surface defects.
Hydrostatic Testing: Each expanded-diameter steel pipe undergoes hydrostatic testing to ensure it meets the standard test pressure requirements; the equipment has automatic recording and storage functions.
International Certifications:
ISO 9001:2015 Quality Management System
API Spec 5L / 5CT American Petroleum Institute Certification
CE Certification (EN 10217, EN 10219)
PED Certification Pressure Equipment Directive
EN 10204 3.1/3.2 Material Certificates Available
- After-Sales & Technical Support
Technical Selection Support: Our professional engineering team can assist clients in material selection analysis based on media characteristics (corrosiveness/temperature/pressure), operating environment (indoor/marine/extreme cold), and industry standards.
- OEM Customization & OEM Services
✔ Size Customization
**Custom Cutting:** Cutting pipes to any length according to customer requirements, standard 3-12 meters, with support for custom-made 18-meter ultra-long welded pipes.
**Non-standard Specifications:** Special outer diameters or wall thicknesses can be negotiated with steel mills (minimum order quantity required).
**Minimum Order Quantity:** Utilizing modular production lines, the minimum order quantity can be reduced to 50 meters.
✔ Material Customization
Matching exclusive materials according to different industry needs. For example, X80 grade high-strength steel can be customized for oil pipelines, and food-grade stainless steel welded pipes are certified to GB/T 24511. Through alloy composition adjustment and optimized heat treatment processes, the pressure resistance of welded pipes can be increased by more than 30%.
✔ Value-Added Processing Services
Pipe End Processing: Beveling, Threading (API round thread/trapezoidal thread)
Drilling/Opening: Prefabrication of branch pipe openings according to drawings
Pipe Bends/Irregular Shapes: D-section, elliptical pipe, five-lobed plum blossom pipe, etc.
Coating/Linening: FBE epoxy powder coating, cement mortar lining, polyurethane insulation layer
✔ Customized Packaging and Labeling
Export Packaging: Bundling and reinforcement according to sea freight requirements; waterproof cloth wrapping or pallet packaging available.
Customized Markings: Labeling according to customer requirements (project name, furnace batch number, component number, QR code, etc.)
Special Protection: Pipe end protectors, rust-preventive oil spraying
- Why Choose Us?
- Advantages & Dimensions: Our Capabilities
- End-to-End Quality Control: Quality control throughout the entire process from billet to finished product, guaranteed by a four-tiered testing system.
- Full Standard Coverage: Meets international standards such as API, ASTM, EN, JIS, and GB.
- Flexible Production: Adjustable forming units, specification switching within 4 hours.
- Fast Delivery: 7-15 working days for regular customized orders, 48-hour response for urgent orders.
- Service Network: Nationwide warehousing network, 48-hour delivery for regular specifications.
- Technological Value-Added Services: Full-process support including working condition analysis, structural simulation, and installation guidance.
