Large-Diameter Welded Steel Pipe

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

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.