Leading China factory and suppliers of longitudinal welded steel pipes. Using advanced SAW and ERW welding, we provide high-precision, corrosion-resistant piping solutions for oil, gas, and infrastructure projects worldwide.
Our Longitudinal Welded Steel Pipes are high-performance industrial solutions engineered for maximum structural integrity and precision. Designed to meet rigorous international standards including ASTM and API, these pipes are the ideal choice for the secure transportation of fluids and gases, as well as providing critical structural support in the most demanding industrial environments.
By integrating advanced Electric Resistance Welding (ERW) and Submerged Arc Welding (SAW) technologies, we deliver seamless strength and exceptional dimensional accuracy. From deep-sea platforms and urban infrastructure to oil and gas transmission pipelines, our products are optimized for high pressure resistance, superior corrosion durability, and long-term operational reliability.
| Executive Standards | ASTM A53/A53M, ASTM A333, API 5L (PSL1/PSL2) | Material Grades | Carbon Steel (A53-B), Low Alloy (X42-X100), Stainless (304, 316) |
|---|---|---|---|
| Outer Diameter (OD) | 1/2 inch (12.7mm) - 24 inches (609.6mm) | Wall Thickness (WT) | Sch10 - Sch160, XXS, or Custom Specifications |
| Available Lengths | Fixed (6m, 12m) or Random (Max 18m) | Welding Processes | ERW (Small/Medium) & SAW (Large/Thick-walled) |
| Tensile Strength | ≥ 355 MPa | Yield Strength | ≥ 245 MPa |
| Dimensional Tolerance | OD: ±0.5%, WT: ±10%, Straightness: ≤1.5mm/m | Test Pressure | Hydrostatic test ≥ 2.45 MPa (30s hold) |
Utilizing CNC forming equipment to ensure strict adherence to ASTM standards for diameter and wall thickness.
Optimized grain structure via online heat treatment (normalization/tempering) for superior mechanical properties.
Available with hot-dip galvanizing, epoxy coatings, and 3PE layers for harsh soil and acid environments.
Specialized low-temperature steel (ASTM A333) suitable for service from -45℃ down to -196℃.
Comprehensive X-ray, UT ultrasonic, and ET eddy current testing on all weld seams for zero-defect assurance.
Full support for non-standard sizes, custom wear-resistant materials, and project-specific technical drawings.
Full spectral analysis and tensile testing for every raw material batch to ensure strict compliance.
Real-time monitoring of ERW and SAW welding parameters to maintain absolute weld consistency.
Standardized Non-Destructive Testing (UT/ET) reports provided for all industrial shipments.
Rigorous hydrostatic testing protocols to verify safety under high-pressure working conditions.
VCI anti-rust bags and fumigated wooden cases adhering to international marine shipping standards.
Dedicated engineering consultation for installation guidance and project drawing optimization.
| Comparison Metric | Standard Welded Pipes | Our High-Precision Pipes |
|---|---|---|
| Service Life | Standard Industrial | Extended (Due to 3PE/Galvanizing) |
| Installation Cost | High (Due to tolerances) | Low (Precise fit, less adjustment) |
| Maintenance Frequency | Periodic/High | Low (Superior corrosion resistance) |
| Safety Rating | Standard Grade | Ultra-High (100% X-ray inspected) |
| Overall ROI | Baseline | Significant Increase via longevity |
ERW (Electric Resistance Welding) is typically used for small to medium diameters, offering high efficiency. SAW (Submerged Arc Welding) is utilized for large-diameter and thick-walled pipes, providing deeper penetration and higher strength.
We comply with major international standards including ASTM A53/A53M for general service, ASTM A333 for low-temperature service, and API 5L (PSL1 and PSL2) for oil and gas transmission pipelines.
Yes, our ASTM A333 grade pipes are specifically designed for low-temperature service, maintaining toughness and integrity in environments ranging from -45℃ to -196℃.
For marine applications, we offer hot-dip galvanizing, epoxy coal tar pitch, and 3PE (three-layer polyethylene) anti-corrosion coatings to protect against saltwater and soil corrosion.
We implement a full-process quality control system including 100% X-ray inspection of weld seams, ultrasonic testing (UT), and hydrostatic pressure tests to ensure zero leakage.
Absolutely. We provide extensive customization services for non-standard sizes, special materials (wear-resistant or low-temp steel), and custom coatings based on your project drawings.
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