The hot-dip galvanized steel pipe production line uses ordinary steel pipes as raw material, centered around the continuous operation of “pre-treatment - dipping - post-treatment,” with a clear process flow:

Steel pipe pre-treatment: First, degrease the pipes (removing surface oil contamination), then pickle them (removing rust and creating a rough surface to enhance zinc coating adhesion). This is followed by water rinsing and passivation treatment to ensure the pipe body is clean;

Preheating and Galvanizing: Pre-treated pipes are preheated to 400-500°C before immersion into molten zinc at 440-460°C, simultaneously forming a zinc-iron alloy layer and pure zinc layer on both inner and outer surfaces.

Post-treatment and quality inspection: After hot-dip galvanizing, pipes undergo cooling, passivation (enhancing zinc coating corrosion resistance), straightening, and cutting to length. Final inspection verifies zinc coating thickness and adhesion; qualified products become finished goods.

Production lines typically operate continuously to ensure uniform zinc coating and corrosion protection. Products are suitable for corrosion-resistant applications in building water supply/drainage systems and municipal pipelines.