Hot-dip Galvanized Steel Pipe vs Cold-dip Galvanized Steel Pipe

1. The Manufacturing Process Is Different

Hot-dip galvanized steel pipe is to make the molten metal and iron substrate reaction to produce an alloy layer, so that the substrate and the coating together.
Cold galvanized steel pipe is mainly through the electrochemical principle of anti-corrosion cold galvanized coating.

2. The Different Equipment Required

Hot-dip galvanized steel pipe: pickling equipment, bottom drawing annealing furnace or hood annealing furnace.
Cold galvanized steel pipe: electrolytic equipment.

3. different Performance
Hot-dip galvanized: durable corrosion protection, standard quality hot-dip galvanized rust thickness makes it has excellent durability; coating toughness, hot-dip galvanized layer to form a unique molten metal structure. The structure can withstand mechanical damage during transportation and use.

Cold galvanizing: has excellent environmental properties. Most cold galvanizing solvents and diluents do not contain highly toxic organic solvents, cold galvanizing process also reduces the volatilization of organic solvents, reduces drying energy consumption, is conducive to environmental protection.

4. The Thickness Of The Galvanized Layer Is Different
Hot-dip galvanized steel pipe zinc layer is thicker, the thickness of 10um or more. Although the surface is bright, but rougher, there will be sequins.
Electro-galvanized (cold galvanized steel pipe) zinc layer is very thin. As long as the thickness of 3-5um, although the surface is smooth, but will appear dark and dirty, good processing performance, corrosion resistance is insufficient.

5. Different Applications
Hot-dip galvanized steel pipe is widely used in electric power towers, communication towers, railroads, highway protection, street lamp poles, ship components, building steel structure components, substation appurtenances, light industry and other fields Characteristics.
Cold galvanized steel pipe is the main development direction of environmentally friendly heavy duty anticorrosion coatings.