Wanzhi Steel exports 304 tons of color steel coils to Sri Lanka

Sri Lankan customers ordered 304 tons of dark color steel coils from us. The customer was very satisfied with the product he received, saying that the color of the steel coil remained bright and rust-free after being washed by hot temperatures and rain. The following is the case record.

Standard seaworthy packaging

Black color steel coil production

Customer Background

The client is a construction contractor in Colombo, Sri Lanka, who runs a medium-sized construction company and focuses on commercial factories and simple housing projects. Due to the humid and rainy climate in Sri Lanka and the large fluctuations in local steel prices, the client needed a corrosion-resistant and cost-controlled building material for the roof and walls of the new logistics warehouse. After comparing many options, the client finally chose to import Color Coated Steel Coil from Wanzhi Steel in China.

Black color steel coil

Production process

• Substrate preparation: Use Z180 galvanized steel coil (zinc layer 180g/m²) to ensure the bottom layer is rust-proof.
• Surface treatment: degreasing → cleaning → phosphating → chemical conversion film treatment.
• Coating process: fully automatic roller coating line, first epoxy primer, then HDP topcoat, baking and curing.
• Cooling and coiling: After curing and cooling to room temperature, cut and coil. PE protective film can be applied to the surface to prevent scratches during transportation.

Coloring

Textured Color Steel Coil

Brushed grey color steel coil

Production Video

Quality inspection

Thickness and size inspection

Vernier caliper measures the thickness of the substrate, ensures that there are no scratches, rust, oil stains or pitting on the surface, and the edges are flat and burr-free, and the tensile strength and yield strength are tested.

Coating inspection

The coating thickness gauge measures the thickness of the coating on both sides, and the coating adhesion is checked by a cross grid (grid method) with a blade. Salt spray test, the coating has no rust, blistering or peeling. Acid and alkali resistance test.

Process inspection

Plate flatness, hardness test to determine whether the coating is completely cured, check the label of each roll of color steel coil, and confirm that the specifications, models, production batches, order numbers, and other information are clear and accurate.

Thickness measurement

Textured surface close up

salt spray tests

Packaging and transportation

• Moisture-proof packaging: The inner layer of steel coil is made of anti-rust paper, and the outer layer is iron sheet.
• Ocean transportation optimization: 40HQ container loading, providing real-time logistics tracking.
• Customs clearance documents: COC certification, MSDS, and certificate of origin are provided.

Outer packaging

Package

Loading into container

This is a video of PPGI steel coil loading taken at our plant.

Application of Color Coil in Sri Lanka

• Building roof: Roofs of logistics warehouses, greenhouses, farms, etc., with corrugated board (corrugated type) design, fast drainage, and typhoon resistance.
• Wall enclosure: Walls of industrial plants, warehouses, stadiums, exhibition halls, and concerts, vertical installation, joint sealing treatment, moisture-proof and heat insulation.
• Cold storage and insulation engineering: compounded with insulation materials such as polyurethane and rock wool to form insulation sandwich panels, which are used in cold storage, refrigerated trucks, constant temperature workshops and other places that require insulation.
• Steel structure building supporting: used in conjunction with H-shaped steel, C-shaped steel, etc. as the enclosure material of the steel structure frame. Construct light steel structure buildings.
• Billboards and signs: substrates for light boxes, site signs, and billboards. Patterns or text can be printed on the surface.

Art museum roof

Residential Yard Fence Panels

Residential Yard Fence Panels

Why choose color steel coil?

Key factors for customer decision-making:

• Weather resistance: HDP coated color steel coils are UV-resistant and salt spray-resistant, suitable for Sri Lanka’s tropical marine climate.
• Lightweight: The weight is only 1/10 of that of traditional concrete structures, only 4-6kg per square meter, reducing the building load.
• Fast installation: The coils can be directly processed into corrugated plates, cut on site, and bolted, shortening the construction period by more than 50%.
• Cost advantage: Chinese color steel coils are more cost-effective than European suppliers.

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