The Ultimate Material Selection Guide for Pre-Painted Steel

In the world of construction, manufacturing, and design, selecting the right materials is a critical decision that can significantly impact the outcome of a project. Pre-painted steel, often referred to as PPS, is a versatile and widely-used material known for its durability, aesthetic appeal, and corrosion resistance. This comprehensive guide aims to simplify the material selection process by providing key insights into the factors to consider when choosing pre-painted steel for your project or application.

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 Understanding Pre-Painted Steel

Pre-painted steel, as the name suggests, is steel that has undergone a pre-painting process before being used in various applications. This process involves applying a protective paint coating to steel sheets or coils, combining the inherent strength and durability of steel with the added benefits of a protective finish. The result is a material that offers a wide range of advantages, making it suitable for a diverse array of industries and applications.

 Key Factors for Material Selection

 1. Base Steel Material

The first and foremost consideration when selecting pre-painted steel is the choice of base steel material. There are primarily two options to choose from:

- Galvanized Iron (GI): GI is plain steel coated with a layer of zinc through a process known as galvanization. It provides good corrosion resistance and strength, making it suitable for applications where rust prevention is crucial.

- Galvalume: Galvalume, on the other hand, is a zinc-aluminum alloy-coated steel. It offers enhanced corrosion resistance compared to GI, making it ideal for projects in demanding or corrosive environments.

Prepainted Steel Coil(PPGI/PPGL)

 2. Paint Coating

The choice of paint coating is a pivotal aspect of material selection, as it significantly affects both aesthetics and durability. Consider the following factors when evaluating paint coatings:

- Color and Finish: Pre-painted steel is available in a vast spectrum of colors and finishes. It's essential to select colors and finishes that not only meet the aesthetic requirements of your project but also provide the desired level of visual appeal.

- Coating Type: Two common types of paint coatings are polyester and polyvinylidene fluoride (PVDF). Polyester coatings offer good performance and affordability, while PVDF coatings provide superior durability and resistance to fading, making them suitable for high-UV-exposure environments.

 3. Thickness

The thickness of the pre-painted steel coating is another crucial consideration. Thicker coatings generally provide increased protection against corrosion and physical damage. The choice of thickness should align with the specific requirements of your project and the anticipated environmental conditions.

 4. Substrate Conditions

Understanding the conditions to which the pre-painted steel will be exposed is fundamental. Will it be used indoors or outdoors? Will it come into contact with chemicals, moisture, or UV radiation? Having a clear grasp of the environmental factors is essential for selecting the right pre-painted steel material that can withstand these conditions effectively.

 5. Application

The intended application of pre-painted steel is a key determinant in material selection. Different applications require specific attributes:

- Roofing: For roofing applications, pre-painted steel should possess excellent weather resistance, UV protection, and durability to ensure long-term performance.

- Construction: In construction projects, the load-bearing capacity and structural integrity of the pre-painted steel are paramount considerations.

- Automotive: Automotive applications may necessitate pre-painted steel with specific properties such as formability and resistance to impact, ensuring the material meets the stringent requirements of the automotive industry.

 6. Budget and Cost Considerations

Budget constraints are a practical reality in material selection. While it's crucial to choose high-quality pre-painted steel that aligns with the project's requirements, it's equally important to balance performance with cost-effectiveness.

 Advantages of Pre-Painted Steel

Understanding the advantages of pre-painted steel further informs material selection:

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- Corrosion Resistance: Pre-painted steel inherently possesses corrosion resistance due to the base coating of zinc (in GI) or a zinc-aluminum alloy (in Galvalume), coupled with the protective paint layer.

- Aesthetic Versatility: Pre-painted steel offers an extensive array of available colors and finishes, allowing for customization to match architectural, branding, or design requirements.

- Durability: Pre-painted steel is engineered to withstand harsh environmental conditions, making it a durable choice for long-lasting projects.

- Low Maintenance: The protective paint coating reduces the need for frequent maintenance and repainting, translating into cost savings over time.

- Sustainability: Pre-painted steel is recyclable, contributing to sustainable building practices and environmentally conscious projects.

 Conclusion

Choosing the right pre-painted steel for your project involves a thoughtful evaluation of factors such as base material, paint coating, thickness, substrate conditions, application, and budget constraints. By carefully considering these elements and understanding the advantages of pre-painted steel, you can make an informed decision that aligns with your project's goals and requirements.

Pre-painted steel's combination of durability, aesthetic versatility, and corrosion resistance continues to make it a preferred choice in various industries, including construction, manufacturing, and design. Whether you're embarking on a new project or looking to upgrade an existing one, pre-painted steel offers a versatile and reliable solution that stands the test of time.

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Galvalume is considered a special imported product because the process of finding out information about the item is always complicated. Galvalume steel coil specifications always come with a series of dense data in terms of width, hardness, and thickness that importers need to learn carefully before conducting a transaction.

Technical Galvalume Steel Coil Specifications

The technical specifications are the evidence demonstrating the strength, toughness and mechanical properties of products. If you are an importer and do not know the basic specifications below before proceeding to trade the item, it is very easy to meet the situation of receiving the finished product not as expected.

Thickness

The thickness is one of the important galvalume steel coils specifications in the information description table. The thickness will certainly affect the selling price, depending on a coil of steel thickness or thin that the factory will calculate a suitable price for the buyer. Sometimes importers require oversized thicknesses, which will make it difficult to find source because not all factories can meet the special requirement of thickness in production.

Currently, for Galvalume coils, the ideal thickness is usually in the range of 0.25 to 1.2 mm. The reason why is called the ideal thickness because this is the thickness range that most factories can produce and it is often widely applied in many fields.

Coating thickness symbol

Galvalume steel coil has 3 layers including base steel layer, aluminum zinc coating layer and color coating layer. Therefore, when viewing coating symbols, importers need to keep in mind a few definitions. There are 3 common coating thickness symbols in galvalume steel coils specifications used by steel manufacturers including BMT, TCT and APT.

• BMT: reflects the thickness of the base steel layer, which is the inner steel core that has not undergone aluminum galvanizing processes. Therefore, if the galvalume coil is printed with BMT, the importer should understand this as the thickness symbol of the cold rolled coil.
• TCT: The full name of TCT is Total Coating Thickness, which means that the thickness of the product will now include the base steel layer along with the galvanized layer.
• APT: APT is the only symbol for prepainted galvalume steel coil products because APT stands for After Painting Thickness, the thickness of the steel product after color plating.

Width 

Besides the thickness, the width gauge size also plays an important role among galvalume steel coils specifications, the manufacturer will rely on these two parameters to calculate the weight of the steel coil. The common formula for calculating the weight of coiled steel applied by many factories today is

m (kg) = T (mm) x W (mm) x L (mm) x 7.85

Where T is the symbol for the steel thickness, W represents the width and L is the length of the coil. The number 7.85 is the density of iron in mathematics.

Grade (Hardness)

If thickness was a reflection of the steel's appearance, then hardness would be a measure of the strength for galvalume steel coils. High hardness means that the strength of steel is extremely good and it also shows durability. However, higher hardness also makes the steel become more difficult to handle in machining and design applications. People usually will rely on 3 criteria to evaluate the hardness of steel including: Tensile, Yield Strength and Elongation.

Yield Strength

The manufacturer will put the steel in a specialized machine and start pulling at the 2 heads of the steel, at a certain force when the steel begins to deform, the manufacturer will rely on that to record the Yield Strength of the product.

Tensile 

If Yield Strength reflects the time to deform of steel, then Tensile will be the proof of the maximum strength of a steel product. When the tension between the two heads reaches a large enough to make the steel break at this point, it is called Tensile. Currently, the unit of measure applied to both Yield Strength and Tensile is MPA (N/m2).

Elongation

Elongation is a measure of the distance between the beginning deformed position to the point of failure, it is calculated based on the ratio between Yield Strength and Tensile. If the percentage of Elon is large, it shows that the steel is ductile and easy to form up. Whereas the percentage of Elon is low, it means that the steel is hard and brittle, the steel structure is extremely solid but it will interfere with shaping.

In addition, the steel hardness parameters shown on the information table are usually calculated based on the minimum force impact. More specifically, if the Yield Strength parameter is G300, when testing the steel standard, the manufacturer will have to use a minimum force of 300 Newtons to deform the steel.

Color ID

One color tone will have many different color shades, so learning the color code before implementing trade will help importers avoid the risk of receiving wrong colors. During the negotiation process between the two parties, the manufacturer will often send to customers a RAL color system with certain symbols on them. When the customer reports the color code, the manufacturer will base on the customer's color requirements to mix the paint color.

Commodity classification in galvalume steel coil specification

HS Code

HS is a commodity classification code that is applied to all countries, so when conducting commercial transactions between two countries, understanding the HS Code is the necessary action in determining the category of goods.

Conventional iron and steel products refer to the first 2 digits as 72, the following numbers will classify in more detail the width as well as the thickness of the steel coil. The most common HS Code of galvalume coils today is denoted by 8 digits .

Country of origin & Brand Name

One of the last galvalume steel coil specifications that importers need to pay attention to is information about the origin of the product. Possessing a certificate of origin will make the goods easier to clear and the importer can rely on it to distinguish whether it is an authentic product or a floating product on the market.

Find out the good partner in removing barriers when importing Galvalume steel 

The expanding global economy as a trend has led to the development of cross-border commercial cooperation relationships. Unlike domestic trading, import-export trade, especially steel products, always hinders foreign importers about the diversity in price segment and the choice of Vietnamese reputable factories.

Due to many years of experience and working in the steel industry, MRS Steel is ready to accompany you in solving commercial transaction problems. During the process of establishment and development, we believe that we can advise and help you find a source of quality and reputable goods based on our extensive relationship with domestic steel factories.

If you are in need of importing Vietnamese steel products, specifically galvalume steel products and you are in need of further advice on pricing policy, please contact MRS Steel immediately through the information attached below!

For more prepainted steel coil for water heatersinformation, please contact us. We will provide professional answers.