Name: High Quality Longitudinal Welded Steel Pipes China Suppliers Factory
Availability: InStock
Rating: 4.5 (89 reviews)

High Quality Longitudinal Welded Steel Pipes China Suppliers Factory

Leading China factory and suppliers of longitudinal welded steel pipes. Manufactured via continuous roll forming and SAW/ERW welding, our pipes ensure high dimensional accuracy and stable mechanical properties for industrial use.

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Product Details

Our Longitudinal Welded Steel Pipes are engineered for high-performance industrial applications, combining superior structural integrity with precision manufacturing. Designed to meet stringent international standards including ASTM and API, these pipes provide an ideal solution for the transportation of fluids, gases, and structural support in demanding environments.

By utilizing advanced Electric Resistance Welding (ERW) and Submerged Arc Welding (SAW) technologies, we ensure seamless strength and exceptional dimensional accuracy. Whether for deep-sea platforms, urban infrastructure, or oil and gas transmission, our pipes are optimized for pressure resistance, corrosion durability, and long-term reliability.

Detailed Parameters

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)

Key Advantages

High-Precision Control

Utilizing CNC forming equipment to ensure strict adherence to ASTM standards for diameter and wall thickness.

Enhanced Durability

Optimized grain structure via online heat treatment (normalization/tempering) for superior mechanical properties.

Corrosion Resistance

Available with hot-dip galvanizing, epoxy coatings, and 3PE anti-corrosion layers for harsh soil and acid environments.

Extreme Temperature Use

Specialized low-temperature steel options (ASTM A333) suitable for service from -45℃ down to -196℃.

100% Quality Inspection

Comprehensive X-ray, UT ultrasonic, and ET eddy current testing on all weld seams for zero-defect assurance.

Flexible Customization

Support for non-standard sizes, custom wear-resistant materials, and project-specific technical drawings.

Product Gallery

Management Platforms

Material Analysis

Full spectral analysis and tensile testing for every raw material batch to ensure compliance.

Process Monitoring

Real-time monitoring of ERW and SAW welding parameters to maintain weld consistency.

NDT Certification

Standardized Non-Destructive Testing (UT/ET) reports provided for all industrial shipments.

Pressure Validation

Rigorous hydrostatic testing protocols to verify safety under high-pressure working conditions.

Export Logistics

VCI anti-rust bags and fumigated wooden cases adhering to international marine shipping standards.

Technical Support

Dedicated engineering consultation for installation guidance and project drawing optimization.

Investment Return Comparison

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

Frequently Asked Questions

Q: What is the difference between ERW and SAW welding for steel pipes?

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.

Q: Which standards do your longitudinal welded pipes comply with?

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.

Q: Can these pipes be used in cryogenic environments?

Yes, our ASTM A333 grade pipes are specifically designed for low-temperature service, maintaining toughness and integrity in environments ranging from -45℃ to -196℃.

Q: What anti-corrosion options are available for marine engineering?

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.

Q: How do you ensure the weld quality of the pipes?

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.

Q: Do you support custom diameters and thicknesses beyond standard schedules?

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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