Technical & Material Properties

• Base Material Grades: Q195, Q235, Q345, ASTM A53 Grade A/B, BS 1387.

• Manufacturing Methods: ERW (Electric Resistance Welded), Seamless (Hot Rolled/Cold Drawn).

• Outer Diameter Range: 15 mm – 273 mm (½" – 10").

• Wall Thickness: 1.0 mm – 12.0 mm.

• Zinc Coating Weight:

  • Hot-dip: 200–600 g/m² (average coating thickness 30–85 μm)

  • Electro-galvanized: 40–120 g/m²

• Tensile Strength: 350–550 MPa.

• Yield Strength: 235–345 MPa.

• Coating Adhesion: Meets ISO 1461 or ASTM A123 requirements for cross-hatch adhesion tests.

• Surface Finish: Smooth zinc coating, minimal spangle, optionally passivated or oiled for extended storage life.

  
  

Manufacturing Process & Standards

• Manufacturing Process:

  1. Steel coil or billet preparation and forming into round section

  2. High-frequency welding (ERW) or seamless pipe extrusion

  3. Pickling to remove mill scale

  4. Hot-dip galvanizing in molten zinc bath at ~450°C or electro-galvanizing

  5. Cooling, passivation, and inspection

• Standards:

  • ASTM A53, ASTM A123 (coating)

  • BS EN 10240 (internal/external coating)

  • GB/T 3091 (welded steel pipe for low pressure fluid)

• Inspection:

  • Coating thickness and weight (magnetic gauge or weighing method)

  • Hydrostatic pressure test for fluid-carrying pipes

  • Bend and flattening tests

  • Visual inspection for coating defects and weld seam integrity

• Packaging: Bundled with steel straps, capped ends to prevent debris entry, optional plastic wrap for extra corrosion protection.

Product Real Shot

Packaging and Shipping

Applications & Advantages

• Applications:

  • Structural frameworks for greenhouses, scaffolding, and guardrails

  • Water supply and drainage systems (non-potable)

  • Outdoor poles, signposts, and fencing systems

  • Automotive exhaust systems (in some low-cost designs)

• Advantages:

  • Zinc coating provides sacrificial corrosion protection, even if scratched

  • High strength-to-weight ratio suitable for load-bearing applications

  • Long service life (20–50 years depending on environment and coating weight)

  • Minimal maintenance requirements compared to painted steel pipes

• Example Case: In coastal fencing projects, hot-dip galvanized round pipes with Z500 coating have shown over 30 years of service without significant rusting.

FAQ

Q1: What product information must I provide before making a purchase?
A: Please provide the grade, width, thickness, surface treatment requirements, and the quantities you need.

Q2: What about product pricing information?
A: Prices may vary due to fluctuations in raw material costs.

Q3: Is it possible to send samples?
A: Yes, we offer free samples with express shipping worldwide.

Q4: Do you offer a service for customized products?
A: Yes, we can supply according to your specific requirements.

Q5: Can I visit you in person?
A: Customers from all over the world are welcome to meet with us.

Q6: Can you assist me in importing steel products for the first time?
A: Yes, we can provide support through our experienced shipping agents.