Pre-Painted Galvanized Steel
Why choose us?
After more than ten years of development, we have won a good reputation among customers in Europe, Africa, Latin America, Southeast Asia, the Middle East, and other regions. We maintain cooperation with many domestic and foreign agents and distributors and look forward to your joining!
Strong Production Capacity
Tangshan Xunzhuo International Trade Co., Ltd. is a steel group company integrating the steel industry and international trade. We have 7 production lines, more than 500 employees, and a monthly production capacity of 100,000 tons, completing orders for customers efficiently and timely.
Complete Range of Products
The company's main products include galvanized steel coils, galvalume steel coils, color-coated steel coils, corrugated steel roof panels, cold-rolled hard steel, aluminum color-coated coils, tinplate, TFS and other plates as well as angle steel, channel steel, H-shaped steel, Wire rod, rebar/rebar, steel pipe, steel strip, etc.
Strict Quality Inspection
Professional technical quality inspection personnel conduct quality inspections on the products ordered by customers. From production, and packaging to transportation, they carefully conduct quality tracking throughout the entire process to ensure that customers receive satisfactory products.
Professional Service
We have a professional service team and a complete sales process. All personnel in each position of the company have more than many years of foreign work experience. The overall team has professional knowledge, contract performance capabilities, and risk resistance capabilities to provide customers with professional and high-quality services.
The prepainted galvanized steel coil is a kind of color-coated steel coil (PPGI coil). It uses galvanized steel as the base metal. The zinc layer offers strong corrosion resistance. Plus with painting, it is more durable than galvanized steel. The metallic-coated steel then experiences some cleaning procedures, and pre-treatment solutions and ultimately gets multiple layers of organic coatings, including laminates, vinyl dispersions, and paint. This continuous technique of applying different coatings is referred to as coil coating. Therefore, the steel coil doesn't require painting or finishing when employed in finished products.
Types of Pre-Painted Galvanized Steel
Cold-Rolled Substrate Color Coated Steel Plate
The color plate produced from the cold-rolled substrate has a smooth and beautiful appearance, and has the processing performance of the cold-rolled plate; however, any fine scratches of the surface coating will expose the cold-rolled substrate to the air, so that the exposed iron is exposed. Red rust occurs fast, so this type of product can only be used for less demanding temporary insulation measures and for indoor use.
Hot-dip galvanized coated Steel Sheet
The product obtained by coating the organic paint on the hot-dip galvanized steel sheet is a hot-dip galvanized coated sheet. In addition to the zinc protection, the organic coating on the surface of the hot-dip galvanized coated sheet also functions as an isolation protection against rust, and has a longer service life than the hot galvanized sheet. The zinc content of the hot-dip galvanized substrate is generally 180 g/m 2 (double-sided), and the galvanizing amount of the hot-dip galvanized substrate for construction use is 275 g/m 2 at the maximum.
Hot-Dip Galvanized Steel
Hot-dip galvanized steel for color-coated substrates are mainly two kinds: 55% AI-Zn and 5% AI-An.
Electro-Galvanized Steel Plate
The electroplated zinc plate is used as the substrate, and the product obtained by baking the organic coating is an electro-galvanized steel-coated plate. Since the zinc layer of the electro-galvanized plate is thin, the zinc content is usually 20/20g/m2, so the product is not suitable for use. Make walls, roofs, etc. outdoors. However, due to its beautiful appearance and excellent processing performance, it can be used mainly for home appliances, audio equipment, steel furniture, and interior decoration equipment.
Corrosion Resistance: Pre-painted galvanized steel sheet is highly corrosion-resistant. The galvanized layer on the steel sheet provides a barrier that prevents the steel from coming into contact with the surrounding environment, which can cause corrosion. Additionally, the painted layer on top of the galvanized layer provides further protection against corrosion, as it seals the galvanized layer and adds a layer of protection to the steel. This makes pre-painted galvanized steel sheets an ideal material for outdoor or corrosive environments where traditional steel would be prone to rust and corrosion.
Durability: PPGI and PPGL are highly durable. The combination of the galvanized layer and the painted layer makes it more resistant to scratches, dents, and other forms of damage compared to traditional steel. The galvanized layer provides a barrier that protects the steel from corrosion, while the painted layer adds layer of protection to the steel and also improves its aesthetics. The durability of the pre-painted galvanized steel sheet makes it an ideal material for use in various applications, including roofing, wall cladding, and other building and construction purposes, where it can withstand harsh environmental conditions and frequent exposure to the elements.
Aesthetically Pleasing: Pre-painted galvanized steel sheets can be aesthetic, depending on the design and color chosen. The pre-painted coating can provide a smooth and consistent finish, which can enhance the visual appeal of the steel sheet. Additionally, PPGIare is available in a wide range of colors and patterns, allowing for greater design flexibility and customization.
Energy Efficient: Pre-painted galvanized steel sheets have high solar reflectance, which means they can reflect a significant amount of solar radiation and reduce heat absorption. This can help to reduce cooling energy requirements in buildings, particularly in hot climates. PPGI and PPGL can also be used as part of cool roofing systems, which are designed to reflect more sunlight and absorb less heat than traditional roofing materials.
Low Maintenance: The pre-painted coating also helps to protect the steel sheet from damage caused by weather and environmental factors, such as UV radiation, moisture, and pollution. This can reduce the need for frequent cleaning and upkeep. Furthermore, pre-painted galvanized steel sheets are often used in applications that require minimal maintenance, such as roofing, siding, and paneling. These materials are designed to withstand harsh weather conditions and resist fading and chalking over time, which can further reduce maintenance needs.
Roofing
Prepainted steel is a smart choice for roofing. These durable panels last more than 50 years. Prepainted steel roofing is also heat resistant and low maintenance allowing companies to save on related costs. And for those looking to go green, metal roofs may help in reaching LEED certification. Versatility is also an advantage. Prepainted steel can be cut into any shape, including shingles, tiles, and slates.
Garage Doors
Garage doors play a lot of parts - a backboard for driveway basketball, base in a game of tag, the unintended target of a driver learning to park. And the real job: storage for life’s miscellaneous things. With these responsibilities, garage doors need to be tough. Prepainted steel makes it happen. Prepainted garage doors are a new market trend and are highly appealing to consumers. Those tired of traditional white doors find that prepainted steel offers more colors, textures, and styles - and lasts longer too!
Heating and Air Conditioning
The last thing anyone needs on a brutal summer day is for the AC to die. Expensive pieces of equipment like heating and cooling systems make our lives comfortable and protect businesses from disaster. Think AC in a grocery store. But these machines are often subject to extreme situations. From blistering heat to tornados, flooding, and freezes, the systems that protect us need protection too. The tough exterior of prepainted steel shields heating and air conditioning systems from the elements. And its corrosion resistance means long-lasting protection for years to come.
Lighting and Appliances
Just as with garage doors, consumers and manufacturers alike are flocking to prepainted steel lighting and appliances. And for many of the same reasons. Not only does prepainted steel offer dozens of styles, colors, and finishes from an aesthetic view, but there are practical benefits too. From faster production time and lower costs to improved quality (remember uniform coverage), prepainted lighting and appliances are a smart alternative to post-paint products.
Clear Protective Coat (Layer 01)
Many products do not have a top coat as the majority of products are 2 layers (primer and topcoat) but this extra layer can add a layer of protection that increases UV protection, and therefore reduces the likelihood of color fade, and scratch resistance. It is a clear layer so does not dilute or affect the color underneath.
Painted Top Coat (Layer 02)
For pre-painted steel this is the layer that the end user will see and the key aesthetics come from a combination of the color & design; the emboss style & depth (or whether to emboss at all); and the gloss level. The type and depth of emboss used depends on the supplier and offers a unique texture to the product. The depth of the emboss can be from 50 microns but some emboss designs could trap dirt so the environment the finished product will be in must be considered when choosing an emboss type and depth.
Primer (Layer 03)
Primer is typically only added to the top of the steel as it ensures a strong adhesion with the top layer of paint. It may also be added to the bottom layer depending on the environment the finished product will be in and the type of base coat being added.
Zinc Alloy (Layers 04 & 06)
This layer is critical in protecting the steel and can provide excellent corrosion resistance even on the cut edges. It can be 100% Zinc but is often made up of Zinc & Aluminium and the exact proportion of each is unique depending on the supplier and the product.
The Cold Rolled Steel Substrate (Layer 05)
The steel has already undergone significant processing to get to this stage. Typically originating from a Blast Furnace & BOC process, the slabs are hot rolled to create a thin steel coil and then cold rolled to create a steel sheet at the desired thickness/ gauge. The cold rolling process creates a thinner material and is used to refine the properties of the finished product.
Backing Coat (Layer 07)
The thickness, appearance, and qualities of the backing coat are entirely dependent on the end use of the product. In some cases, the base/reverse side of the steel sheet will be visible to the end consumer in which case the material needs to meet aesthetic standards as well as meet corrosion and fire standards, for example in some agricultural buildings.
Process of Pre-Painted Steel Coil
Cleaning the Metal Strip
Cleaning up the oil, dirt, and impurities of the cold-rolled coil involves brushing, an alkaline dip, a water bath, or brushing.
Application of Zinc and Alloy
The application of aluminum and zinc depends on the application and customer requirements. Some products consist of 100 percent zinc, while others contain magnesium alloy.
Treatment of the Surface
This step is vital to ensuring that the paint and primer bond well with the metal strip. Due to some chemical restrictions, the surface is treated with chemicals, such as alkaline oxidation, depending on the supplier and country of origin.
Metal Rinsing and Drying
Rinsing the metal strip helps ensure that it has no chemical residue before applying primer. Drying the metal is a must to ensure that the subsequent layers bond well.
Application of Primer
A coating of primer can be on one or both sides of the metal strip. Primer application hastens the adhesion of the finished paint layer.
Curing and Cooling the Strip
Curing takes 15 to 16 seconds. This method allows the primer to harden, dry, and reach the desired temperature before applying the next coating.
Front and Back Coating
This step is the final painting stage, wherein two-coat paint systems are applied.
Drying, Curing, and Cooling
The product undergoes this step to ensure that the steel product is ready for rewinding, rerolling, and shipping to end users.
Packaging
Image showing a coil coating line schematic.
According to the tables, when purchasing color-coated steel, you need to confirm the following information:
- What product do you need, steel sheet, coil, or steel strip;
- Product specification and size;
- Substrate type and zinc layer thickness;
- Types and colors of top/back paint;
- Surface finish requirements;
- Painting structure and functions;
- Weight (order quantity);
- Use purposes;
- Packing method;
- Inner diameter size (coil);
- Other requirements.
How to Choose the Right PPGI Steel Coil?
Coating Hardness: Coating hardness refers to the ability of the plating to resist scratch, friction, crash, or other mechanical action, PPGI steel coil scratch resistance and wear resistance are closely related. Mainly through the use, processing methods, storage conditions, and other options.
Coating Thickness: The thickness has an intimate connection with the corrosion resistance of the PPGI steel coil, and the corrosion resistance usually improves with the increase of coating thickness. The coating thickness should be confirmed by the environmental corrosiveness, service life, and durability.
Coating Color Difference: There will possibly be a color difference during the production and use process of the PPGI steel coil. The color difference is influenced by the production organization, color, use time, use environment, and other factors.
Coating Gloss: Gloss is mainly based on the use and use habits to choose. For example, PPGI steel coils for construction are always selected for medium or low gloss, and PPGI steel coils for household appliances are always selected for high gloss.
Galvanized
- The average thickness is 85 µm.
- Durable, scratch-resistant coating.
- Galvanizing is a more expensive process than painting
- Galvanizing is submerged on molten zinc to ensure complete coverage & protection.
- Provides cathodic and barrier protection to steel, ensuring longer-lasting protection.
- Greater hardness and corrosion resistance means less maintenance over time.
- Galvanizing is only available in silver
Painted
- Thickness varies between 64 µm to 90 µm.
- Generally, not resistant to scratching.
- Our painting process is factory-controlled to ensure complete coverage & protection.
- Barrier protection only. When scratches occur, corrosion of underlying steel is limited.
- An enamel top coat will provide longer-lasting protection.
- Painting provides infinite color choices.
Frequently Asked Questions
We're professional pre-painted galvanized steel manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to wholesale high-grade pre-painted galvanized steel in stock here from our factory. Contact us for quotation.
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