Core Advantage: High-Quality Q235 Substrate + Hot-Dip Galvanizing + Dual Welding Processes, Meeting Diverse Engineering Needs

Galvanized carbon steel welded pipe is manufactured using Q235 carbon structural steel as the base material, formed through High-Frequency Resistance Welding (ERW) or Longitudinal Submerged Arc Welding (LSAW), followed by overall hot-dip galvanizing treatment. Q235 steel offers excellent weldability and comprehensive mechanical properties, with yield strength ≥235MPa, tensile strength 375-500MPa, and elongation ≥26%, making it an ideal base material for structural pipes and fluid transmission pipes -5. The hot-dip galvanizing process ensures uniform zinc coating on both inner and outer walls and weld areas, extending service life by 2-3 times in outdoor humid, industrial pollution, and salt spray environments.

We provide more than just welded pipes; we offer structural support and corrosion protection assurance for your projects.

Why Choose Q235 Grade Galvanized Carbon Steel LSAW/ERW Welded Pipe?

1、High-Quality Q235 Substrate, Reliable Performance

Q235 is a carbon structural steel specified in China's GB/T700 standard, with carbon content ≤0.20% and carbon equivalent typically controlled below 0.3%, offering excellent weldability without complex preheating processes, significantly reducing processing costs -5. This material provides good balance of strength and plasticity, ideal for structural supports and low-pressure fluid pipes.

2、Hot-Dip Galvanizing, Long-Lasting Corrosion Protection

The hot-dip galvanizing process immerses steel pipes in molten zinc at approximately 450℃, forming a dense zinc-iron alloy layer on inner/outer walls and weld areas -10. The zinc coating offers strong adhesion and sacrificial anode protection, protecting exposed steel through electrochemical action even with detail scratches. Suitable for outdoor environments without periodic painting maintenance.

3、Dual Welding Processes, Flexible Selection

ERW (Electric Resistance Welding): Uses hot-rolled coils as raw material, utilizing skin effect and proximity effect of high-frequency current to heat and melt strip edges, achieving pressure welding under squeeze rollers -6. Features high production efficiency, high dimensional accuracy, and smooth surface, suitable for small to medium diameters (≤660mm).

LSAW (Longitudinal Submerged Arc Welding): Uses steel plates as raw material, formed through JCOE or UOE processes followed by double-sided submerged arc welding and typically expansion treatment -6. Suitable for large diameters (325-1600mm) and thick walls (≤60mm), offering excellent weld quality and high pressure-bearing capacity.

4、Wide Applicability, Multiple Uses

Galvanized Q235 welded pipes serve both structural support and low-pressure fluid transmission. In coastal transmission tower applications, galvanized Q235B welded pipes achieve service life up to 25 years -5. When zinc coating adhesion ≥610g/m², salt spray testing exceeds 1000 hours without red rust.

5、Clear Standards, Controllable Quality

Products comply with GB/T 3091 (Welded Steel Pipe for Low-Pressure Fluid Transmission), GB/T 13793 (Longitudinal Electric Welded Steel Pipe), and other standards -5. Also available meeting ASTM A53 and other international standards -2.

Key Application Areas

Construction & Structure: Steel structure buildings, stadiums, bridge supports, scaffolding, guardrail posts, carport frames .

Agricultural Facilities: Greenhouse frames, farm fencing, irrigation pipelines .

Transportation Engineering: Highway guardrails, sign poles, light poles, sound barrier posts .

Municipal Engineering: Cable conduits, ventilation ducts, rainwater pipes, waste station fences .

Fluid Transmission: Low-pressure water, gas, oil pipelines, fire protection pipes (operating temperature -20℃ to 300℃, pressure ≤1.6MPa).

Machinery Manufacturing: Conveyor rollers, machinery frames, forklift masts (local yield strength up to 345MPa after cold bending strengthening).

Technical Specifications

Why Choose Us?

Dual Process Capacity: Equipped with both ERW and LSAW production lines, meeting full range requirements from small to super large diameters.

Substrate Assurance: Using high-quality Q235 hot-rolled coils/plates with stable chemical composition and mechanical properties; material certificates available .

Galvanizing Quality: Mature hot-dip galvanizing process with uniform coating and strong adhesion; zinc layer thickness test reports available .

Custom Processing: Support for cut-to-length, threaded ends, drilling/punching, bending forming, and other secondary processing .

International Certification: Products comply with GB, ASTM, EN standards; third-party inspection reports (SGS/BV) available .

Conclusion: From skyscraper steel structures to agricultural greenhouse frames, from transportation guardrails to fluid transmission pipelines, Q235 grade galvanized carbon steel LSAW/ERW welded pipes support every corner of modern engineering with reliable substrate performance and long-lasting corrosion protection. Contact us today for your tailored galvanized welded pipe solution!

Note: When selecting galvanized welded pipes, please confirm the following elements: Material Grade (Q235B, etc.), Process (ERW/LSAW), OD × WT, Zinc Coating Requirements, Standards, and End Type. For pressure pipe applications, strictly observe operating temperature ≤300℃ and pressure ≤1.6MPa limitations. For more severe corrosive environments, consider composite protection such as 3PE or epoxy coating.