Materials and craftsmanship.

1. Base material type – Standard: Q235B (high versatility, excellent weldability).

– High-strength option: Q355B (increased load-bearing and bending resistance).

2. Galvanization process – mainstream: hot-dip galvanization (hot-galvanizing).

– Zinc layer weight: ≥ 300 to 550 g/m²

– Zinc layer thickness: approximately 45 to 80 μm.

– Surface: Silver gray, uniformly dense, fully coated on both inner and outer walls, highly resistant to rust.

3. Forming Process

Steel strip unwinding → cold bending forming → high-frequency seam welding → trimming → pickling and rust removal → hot-dip galvanizing → straightening → inspection and packaging.