Materials and craftsmanship.

1. Base material: Q235B seamless high-frequency welded pipe; customizable options available for seamless galvanized pipes.

2. Galvanization method: hot-dip galvanization, evenly coated with zinc on both the interior and exterior surfaces. The coating has strong adhesion and does not easily peel off.

3. Zinc coating standards: zinc coating weight ≥ 600 g/m², thickness ≥ 85 μm, resistant to high temperatures, moisture, saline and alkaline environments, and strong corrosion in buried conditions.

4. Execution standards: GB/T 3091, ASTM A53 SCH80, BS1387.