Pre-painted color steel plate

1. Definition and characteristics

Pre-painted color steel plate are metallurgical products made from galvanized/cold-rolled steel sheets, which undergo degreasing and phosphating pretreatment before being coated with organic coatings and baked. They are characterized by their lightweight (4.36kg/m²), high strength, corrosion resistance, and decorative properties. The surface can be customized with patterns such as wood grain or cloth texture.

2. Pre-painted color steel plate Production Process

Mainstream technology: 90% of the products adopt the roller coating process (two coats and two bakes), while the products use three coats and three bakes or four coats and four bakes.

Base plate type: cold-rolled base plate (for indoor use), hot-dip galvanized base plate (for construction), and hot-dip aluminum-zinc coated base plate (for weather resistance).

Coating system: Primer (epoxy/polyester resin, thickness 20-25μm) + Topcoat (PE/PVDF resin, thickness 8-10μm).

3. Application scenarios and selection suggestions

4. Key points for safety and selection

1. Fireproof core material must be selected:

It is strictly prohibited to use: polystyrene, polyurethane foam and other combustible core materials (combustion rate 1.5-2mm/s).

Mandatory scenario: Class A rock wool core material must be used in densely populated areas. ‌

2. Coating and environmental adaptation:

Coastal areas: preferred PVDF fluorocarbon coating (salt spray resistant);

Inland environment: Pre-painted color steel plate PE polyester coating (high cost-effectiveness).

3. Thickness selection:

Typhoon area: ≥ 0.8mm (high load); Conventional factory building: 0.5-0.7mm.

5. Main application scenarios

Pre-painted color steel plate are widely used in the following fields:

Industry and warehousing: such as building factories and warehouses, with short construction periods and high economic efficiency; Coastal areas such as Zhuhai are commonly used for temporary buildings (construction site offices, exhibition sheds). ‌

Building structure: used for roofs and walls, providing waterproofing system; Composite color steel plate (core material made of polystyrene, rock wool or polyurethane) enhances thermal insulation performance. ‌

Home appliances and transportation: such as home appliance casings and vehicle decorative components.

6. Pre-painted color steel plate Production process and core characteristics

Pre-painted color steel plate The production process mainly adopts the roller coating method (accounting for 90%), using a two coating and two drying process. The product uses a three coating and three drying or four coating and four drying process. The substrate types include cold-rolled substrates (indoor use), hot-dip galvanized substrates (building use), etc. The coating system consists of primer (epoxy/polyester resin) and topcoat (PE/PVDF resin), with a thickness of 20-25 μ m/8-10 μ m. The product must comply with the GB/T12754-2019 standard and be tested for adhesion, salt spray resistance, and other properties. Pre-painted color steel plateThe key advantages include:

Lightweight and High Strength: Strong ability to bear wind and snow loads, suitable for large-span buildings.

Durable Decoration: Good weather resistance, resistant to UV rays and acid rain erosion, with rich colors that can be customized.

Convenient construction: easy to process and install, shorten the construction period and reduce costs. ‌‌