Plastic-Coated Anti-Corrosion Production Process

Product Introduction

A plastic-coated steel pipe is a steel pipe with a polymer coating sprayed onto its surface, featuring characteristics such as corrosion resistance, abrasion resistance, acid and alkali resistance, and anti-aging properties. Its production process generally includes the following steps:

   Steel Pipe Surface Preparation: The steel pipe surface is first treated through methods like sandblasting or shot blasting to remove impurities such as scale, oil污, and rust, preparing it for the coating application.

   Powder Coating Application: Powder coating material is loaded into a spray gun and applied to the steel pipe surface using processes like electrostatic adsorption, followed by drying and curing. Various types of powder coatings are available, such as epoxy, polyester, polyurethane, and baked paint, allowing selection based on specific requirements.

   Curing and Baking: The coated steel pipe is placed in a baking oven for curing, which solidifies the coating and ensures strong adhesion to the steel pipe surface.

   Cooling and Quality Inspection: After baking, the pipe is cooled and undergoes quality inspection. This includes checks for coating appearance, thickness measurement, adhesion tests, etc., to ensure the product meets relevant standards and requirements.

The above outlines the general production process for plastic-coated steel pipes used in water supply and drainage. Different manufacturers may implement improvements and innovations based on their specific circumstances and technical expertise, but the fundamental production steps are largely similar.

Plastic-coated steel pipes, also known as steel-plastic composite pipes, use steel pipes as the base body. A plastic anti-corrosion layer is fused to the inner surface, or both inner and outer surfaces, of the steel pipe (substrate) through processes like spraying, rolling, soaking, or suction. These pipes offer excellent corrosion resistance and relatively low friction resistance. Epoxy resin-coated steel pipes are suitable for transporting water, seawater, warm water, oil, gas, and other media. Polyvinyl chloride (PVC)-coated steel pipes are suitable for draining water, seawater, oil, gas, and other media.

Technical Parameters:

   Standard Colors: Black, gray, blue, red, white, green.

   Coating Thickness:

       PE (Modified Polyethylene): 400 µm - 1000 µm

       EP (Epoxy Resin): 100 µm - 400 µm

   Coating Method:

       PE (Polyethylene): Hot-dip coating

       EP (Epoxy Resin): Internal and external spraying

   Product Specifications: DN15 - DN1660

   Ambient Temperature Range: -30°C to 120°C

   Connection Methods: Threaded (DN15-DN100), grooved (DN65-DN400), flanged (applicable for any diameter), welded, bimetallic connection, socket, sleeve, seal connection, etc.

Application Fields

   Various types of circulating water systems (civil and industrial circulating water). They offer excellent performance, with a service life against corrosion of up to 50 years.

   Fire water supply systems.

   Water supply and drainage distribution in various buildings (particularly suitable for cold and hot water systems in hotels, hotels, and high-end residential areas).

   Conveyance of various chemical fluids (resistant to corrosion from acids, alkalis, and salts).

   Buried conduits and crossing pipes for electrical wires and cables.

   Ventilation, supply, and drainage pipes in mines and collieries.