Hot‑Dip Galvanized Large‑Diameter ERW Welded Steel Pipe

For municipal infrastructure, outdoor construction and coastal projects, weld integrity and long‑term anti‑corrosion performance largely control total‑project‑life cost. Our hot‑dip galvanized large‑diameter ERW steel pipe combines high‑frequency electric‑resistance welding and full‑immersion hot‑dip galvanizing. It delivers large bore size, weld‑to‑base‑material equivalent strength and all‑weather anti‑corrosion performance, delivering a cost‑effective steel pipe solution for heavy‑duty, above‑ground, buried and high‑salt‑spray environments.

Different from conventional welded pipes, ERW technology creates continuous tight welds with strength matching parent steel. Tight tolerances on outer diameter and wall‑thickness plus good roundness greatly reduce misalignment and leakage risks during large‑diameter pipeline assembly. After forming, each pipe is fully dipped into molten zinc bath to build metallurgically bonded zinc‑iron alloy coating instead of simple spray paint. Even minor surface scratches cannot expose steel substrate easily thanks to sacrificial anode protection, cutting later maintenance and renovation cost and securing long service life for buried or outdoor installation.

Key Product Advantages

Stable large‑diameter forming: Wide OD range for main water transmission pipelines, heavy structural columns, irrigation trunk lines and port auxiliary piping. Custom ends available: plain end, beveled, grooved or threaded for various site connection methods.

Controlled reliable welds: Continuous high‑frequency resistance welding without filler metal. Dense weld free of slag or blowholes. Online weld inspection for every piece to eliminate common large‑diameter weld defects and guarantee stable pressure resistance.

Full‑tube hot‑dip galvanization: Complete immersion ensures uniform zinc coating both on outer surface, inner bore and weld seams. Standard zinc thickness ≥65 μm; extra‑thick coating optional for coastal high‑corrosion atmosphere against humidity, salt mist and industrial fumes.

Optimized total‑project cost: Compared with seamless and LSAW large‑diameter pipes, hot‑dip galvanized ERW features shorter lead‑time and competitive purchase price, together with outstanding anti‑corrosion performance to lower whole‑life‑cycle expenditure.

Diverse material & standard compliance: Grades include Q235B, Q355B, S235JR, ASTM A53 Gr.B. Meets ASTM, EN, JIS, GB/T3091 standards. EN10204 3.1 mill test certificate available, third‑party inspection (SGS/BV/CCIC) is acceptable.

Main Application

Municipal large‑scale water supply & transmission trunk, farmland irrigation network, urban structural frames, port & jetty auxiliary piping, heavy‑duty outdoor support columns, greenhouse main framework, fire‑protection main pipelines, plant water supply‑drainage, coastal tidal‑zone construction projects.

2026-08-18 164813