Galvanized Welded Pipe

Galvanized Welded Pipe: Durable Corrosion Protection for Industrial & Structural Applications.‌ ‌Engineered for Longevity: Hot-Dip vs. Electroplated Zinc Coatings‌ Galvanized welded pipes utilize ‌Z275-Z450 hot-dip coatings‌ (50–85 µm) to achieve 2,000+ hours of salt spray resistance (ASTM B117), outperforming cold-galvanized alternatives by 8–10x. The ‌Fe-Zn alloy bonding layer‌ formed at 435–455°C ensures 35–50 MPa adhesion strength (ISO 2409), ideal for water treatment plants, offshore rigs, and highway guardrails exposed to pH 4–10 environments.
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Product Introduction

‌Galvanized Welded Pipe: Durable Corrosion Protection for Industrial & Structural Applications.‌

‌Engineered for Longevity: Hot-Dip vs. Electroplated Zinc Coatings‌

Galvanized welded pipes utilize ‌Z275-Z450 hot-dip coatings‌ (50–85 µm) to achieve 2,000+ hours of salt spray resistance (ASTM B117), outperforming cold-galvanized alternatives by 8–10x. The ‌Fe-Zn alloy bonding layer‌ formed at 435–455°C ensures 35–50 MPa adhesion strength (ISO 2409), ideal for water treatment plants, offshore rigs, and highway guardrails exposed to pH 4–10 environments.


‌Certifications & Key Advantages‌

  • ‌ASTM A53 & EN 10219 Certified‌: Compliant with JIS G3444 and GB/T 3091 standards.
  • ‌Cost Efficiency‌: 30% lower lifetime costs vs. stainless steel 316L.
  • ‌Custom Sizing‌: Thickness 0.1–300 mm (±0.15 mm), OD up to 1,200 mm.
  • ‌MOQ 3 Tons‌: HDG (hot-dip) or electroplated (EG) finishes available.

‌Technical Specifications‌

‌Mechanical Properties‌

Property Value Test Standard
Yield Strength 235–355 MPa ISO 6892-1
Tensile Strength 370–500 MPa ASTM E8/E8M
Elongation (A50) ≥20% EN ISO 6892-2
Zinc Coating 50–85 µm (Z275-Z450) EN 1461

‌Material Composition‌:

  • ‌Carbon (C)‌: 0.12–0.20%
  • ‌Manganese (Mn)‌: 0.30–0.65%
  • ‌Silicon (Si)‌: ≤0.30%

‌Coating Process‌:

  1. ‌Pickling‌: HCl solution (10–15%) removes mill scale (ISO 8501-1 Sa2.5).
  2. ‌Fluxing‌: ZnCl₂-NH₄Cl bath prepares surface for Fe-Zn bonding.
  3. ‌Galvanizing‌: 435–455°C immersion for 3–8 minutes.

‌Dimensional Tolerances‌

Parameter Tolerance
Wall Thickness ±10% of nominal size
Outer Diameter ±1% of OD
Straightness ≤2 mm/m

‌Applications‌

  1. ‌Construction‌: Scaffolding, roof trusses, and sewage systems.
  2. ‌Utilities‌: Municipal water pipelines, gas distribution networks.
  3. ‌Energy‌: Solar farm mounting systems, geothermal steam lines.
  4. ‌Transport‌: Bridge crash barriers, railway signal posts.

‌Fabrication Guidelines‌

  • ‌Cutting‌: Plasma arc (speed ≤1.2 m/min for HDG).
  • ‌Welding‌: Use E7018 electrodes (preheat 100–150°C).
  • ‌Bending‌: Minimum radius = 4x pipe diameter.
  • ‌Painting‌: Apply zinc-rich primer (5 µm) + epoxy (25 µm).

‌Quality Assurance‌

  • ‌Coating Thickness Test‌: Magnetic induction gauge (ISO 2178).
  • ‌Hydrostatic Pressure‌: 6.9 MPa held for 30 sec (API 5L).
  • ‌Certifications‌: PED 2014/68/EU, ISO 9001:2015, and RoHS.

‌Competitive Edge‌

  • ‌Lifespan‌: 25–40 years in coastal/industrial zones.
  • ‌Lead Time‌: 15–20 days (MOQ 3 tons).
  • ‌Sustainability‌: 100% recyclable with 20% lower CO₂ vs. stainless steel.

‌Logistics & Compliance‌

  • ‌Packaging‌: VCI paper + steel straps (ISPM15 compliant).
  • ‌Temperature Range‌: -30°C to 450°C (HDG), 0°C to 200°C (EG).
  • ‌Optional Coatings‌: Aluminized-silicon or PTFE upon request.

‌Comparative Analysis‌

Material Corrosion Resistance Max Temp (°C) Key Applications
‌HDG Welded‌ Extreme (2,000 hrs) 450 Offshore rigs, Bridges
Cold-Galvanized Moderate (250 hrs) 120 Indoor electrical conduits
PVC Schedule 80 High 60 Chemical drainage

‌Request Free Samples or Corrosion Test Reports Today!‌
Certifications: ASTM, EN, JIS. Global logistics partners.

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Supplier of various types of carbon steel

Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.

Luo Kaiwei Steel Company is a multi-ISO certified steel manufacturer specializing in carbon steel plates, pipes and galvanized coils since 2010. Competitive prices and ASTM/JIS compliant. Get instant quotes for bulk orders and global shipping support.

Tel: +86 15635685959

E-mail: [email protected]  

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