Internally and externally coated epoxy composite spiral steel pipes are commonly used in fire water supply. In the field of building fire protection systems, epoxy resin steel pipes play an important role, gradually replacing galvanized steel pipes. Below, we will introduce the production process of internally and externally coated epoxy resin steel pipes, the properties of their powder (epoxy resin), and the product performance of internally and externally coated epoxy resin steel pipes.

Internally and externally coated epoxy composite steel pipe

When spraying, the epoxy resin powder has not fully fused to the inner and outer walls of the substrate. After 30 minutes of preheating and curing, the curing agent inside the epoxy resin is completely cured, making the coating adhesion of the inner and outer walls stronger and fully demonstrating the characteristics of the thermosetting powder.

1. The epoxy resin coated steel pipe is first subjected to pre-treatment on the base pipe.

2. Sandblasting shall be carried out on the steel pipe, and the sandblasting and rust removal on the surface of the steel pipe shall comply with BG/T8923 to achieve Sa2 1/2 level, ensuring roughness and improving adhesion.

3. Place the sandblasted steel pipe into an electric oven for preheating, and preheat it for about an hour and a half when the temperature reaches 200 ° C~250 ° C (usually preheated for about an hour and a half).

4. Coating the preheated pipes - After coating, place them in a curing box for curing (hold for 15 minutes when the temperature reaches 200 degrees) to produce the finished product.

5. Preheat the heating equipment to 180 degrees after spraying to cure the sprayed substrate.