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Large-Diameter Welded Steel Pipe

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Steel fuels the heartbeat of infrastructure, while precision sets the benchmark for industrial engineering. Specialized in cold-working steel pipe manufacturing, we provide two premium product lines:large-diameter cold-rolled welded steel pipesfor cost-effective bulk infrastructure, andcustom seamless round steel tubesfor high-pressure rigorous working conditions. Our products serve diverse industries including municipal piping, oil & gas transmission, heavy machinery, and steel structure construction. All dimensions, wall thicknesses, materials and anti-corrosion treatments are fully customizable, delivering reliable structural strength for every engineering project worldwide.

Two Core Products & Outstanding Advantages

Large-Diameter Cold-Rolled Welded Steel Pipe (Ideal for Large-Scale Infrastructure)

Fabricated from prime steel strips via multi-pass room-temperature cold forming plus high-frequency precision welding, superior to conventional hot-rolled welded tubes:

•Uniform wall thickness & tight outer diameter tolerances, smooth surface without extra polishing needed.

•Automated submerged arc / high-frequency welding technology; welds pass ultrasonic flaw detection and hydrostatic pressure tests, with strength nearly equivalent to base metal.

•Flexible production for extra-large diameters, perfect for long-distance water supply, natural gas & oil pipelines, coastal municipal main piping with outstanding cost efficiency.

•Custom anti-corrosion treatments available: 3PE coating, hot-dip galvanizing, coal tar epoxy, resisting soil erosion, salt spray and acid-alkali environments for extended underground service life.

•One-stop auxiliary processing: fixed-length cutting, beveling, pipe end finishing to shorten construction timeline greatly.

Custom Seamless Round Steel Tube (Preferred for High-Pressure Harsh Conditions)

Manufactured by piercing solid steel billet and cold rolling, entirely weld-free with homogeneous internal microstructure:

•No weak welding seams; excellent pressure resistance, high-temperature tolerance and impact resistance, safe for high-pressure fluid delivery, hydraulic systems, boiler piping and chemical medium transportation.

•Cold-drawn precision processing ensures ultra-high dimensional accuracy; smooth inner bore reduces fluid resistance, ideal for precision machinery, construction equipment frames and wind power supports.

•Full non-standard customization for OD, wall thickness and length, covering thin-wall precision tubes to heavy-wall load-bearing tubes.

Comprehensive Customization Service for Project-specific Needs

Size Customization

Outer diameter, wall thickness, arbitrary length cutting, pipe beveling and threading upon request.

Material Customization

Carbon steel, low alloy steel and alloy steel series for normal pressure, high pressure, corrosive and low-temperature scenarios.

Surface Anti-corrosion Customization

3PE triple-layer coating, hot-dip galvanizing, plastic coating, anti-rust paint, pickling & passivation.

Authorized Quality Certification

API 5L, ASTM, EN international standards inspection reports, EN10204 3.1 material certificates for global export clearance and project acceptance.

Application Fields

Oil & gas transportation, municipal water supply & drainage, coastal cross-sea infrastructure, wind power tower supports, steel workshop frames, construction machinery hydraulic pipelines, chemical fluid conveyance, greenhouse frames, port load-bearing structures, boiler pressure piping.

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