How to Select Materials Reasonably for Pre-painted Steel Sheets

The reasonable selection of materials for pre-painted steel sheets can minimize costs while fulfilling usage requirements. Conversely, inappropriate selection leads to increased costs or product inadequacy, emphasizing the vital importance that clients should place on proper material selection. Xuzhou Powerson Metal Technology Co., Ltd. offers pre-sales technical services, providing professional advice and recommendations for clients in their selection process.

1. Key Indicators for Material Selection of Pre-painted Steel Sheets primarily include mechanical properties, substrate types and coating weights, as well as performance of the front and back coatings.

2. Mechanical Property Selection is mainly based on intended use, processing methods, and the degree of deformation. Factors such as strength, formability, and load-bearing capacity of the pre-painted steel sheet should be considered during selection. Common processing techniques involve shearing, bending, and rolling, necessitating a comprehensive assessment. It’s also crucial to note that the coating process and extended storage periods can affect the mechanical properties of the sheets.

3. Choice of Substrate Type and Coating Weight is guided by application, corrosiveness of the usage environment, lifespan, and durability requirements. The coating weight should be determined according to the level of corrosion resistance required in the specific environment, with heavier coatings and more corrosion-resistant substrates used in highly corrosive settings to ensure the desired lifespan and durability.

4. Selection of Front Coating Performance revolves around choosing the type of coating, thickness, color difference, gloss, hardness, flexibility/adhesion, durability, and other characteristics. The backside coating properties are typically selected by the supplier based on use and environmental conditions. Generally, in terms of coating durability, PVDF (polyvinylidene fluoride) > high-durability polyester > silicon-modified polyester > polyester.

5. Hot-dip 55% Aluminum-Zinc and Zinc-Aluminum-Magnesium substrates, under normal circumstances, exhibit better corrosion resistance compared to hot-dip galvanized substrates. However, caution should be exercised when using 55% aluminum-zinc coated substrates in alkaline environments.

6. For highly corrosive special environments such as ceramic factories, acid pickling workshops, electroplating plants, paper mills, dye houses, tanneries, and certain environments like chemical plants, smelters, gas generators, thermal power plants, breweries, steam environments, heavily polluted industrial dust environments, locations near heavy industrial zones, or within 1000 meters of coastal lines, it is advisable to opt for high zinc layer content 55% aluminum-zinc or zinc-aluminum-magnesium substrates.