Technical & Material Properties

• Base Material Grades: Q195, Q235, Q345, ASTM A500 Grade A/B/C.

• Section Size Range: 15×15 mm – 500×500 mm.

• Wall Thickness: 1.0 mm – 20.0 mm.

• Zinc Coating Weight:

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

  • Electro-galvanized: 40–120 g/m²

• Mechanical Properties (Q235 typical):

  • Tensile Strength: 370–500 MPa

  • Yield Strength: 235 MPa (min)

  • Elongation: ≥ 20%

• Surface Condition: Smooth, uniform zinc layer; available in passivated finish to minimize white rust formation.

• Dimensional Tolerances: Conform to EN 10219 or ASTM A500 (±1% on width/height, ±0.5 mm on wall thickness).

Manufacturing Process & Standards

• Manufacturing Process:

  1. Steel coil slitting and forming into square section via cold forming rolls

  2. High-frequency welding of seam (for ERW pipes)

  3. Pickling to remove surface oxides

  4. Hot-dip galvanizing at ~450°C or electro-galvanizing

  5. Cooling, passivation, inspection, and bundling

• Standards:

  • ASTM A500 (structural tubing)

  • EN 10219 (cold-formed welded hollow sections)

  • GB/T 3094 (cold-formed welded steel hollow sections)

  • ASTM A123 (coating thickness and quality)

• Inspection:

  • Coating adhesion test (tape pull or hammer tap test)

  • Ultrasonic weld inspection for seam quality

  • Dimensional verification (width, height, wall thickness)

  • Corrosion resistance testing (salt spray or accelerated weathering)

• Packaging: Bundled with metal straps, plastic-capped ends, optional VCI film wrap for maritime shipment.

Product Real Shot

Packaging and Shipping

Applications & Advantages

• Applications:

  • Steel frameworks for warehouses, sheds, and pavilions

  • Fencing posts and gates

  • Furniture frames, shelving, and modular racks

  • Signboard supports and billboard structures

• Advantages:

  • Square shape provides multi-directional load capacity

  • Zinc layer prevents corrosion and extends service life

  • Easy to cut, drill, and weld for customized structures

  • Compatible with powder coating or painting for enhanced appearance

• Example Case: Industrial racking systems using 80×80×3.0 mm galvanized square tubing have maintained full load-bearing performance for over 15 years without major maintenance.

FAQ

Q1: What product information must I provide before making a purchase?

A: Please provide the material, size, 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.