The European Standard EN 10142 explains the requirements for making coated flat metals. It is actually a standard for hot-dip galvanized steel coils.
What is the EN 10142?
EN 10142 lists the technical delivery conditions. Makers must follow them for making hot-dip zinc-coated flat metal products. The document also covers the specific product types covered by the standards. Dimensions, materials, and performance requirements appear in the publication.
Also, this document serves as the official English version of the standard. The requirements are also published in French and German. Member nations use these documents as a guide in making their products.
Mechanical Properties
Mechanical requirements for hot-dip zinc coated flat metal products appear under EN 10142. It includes proof and tensile strength, elongation, and strain coefficient requirements. It’s important to note that these mechanical requirements depend on the steel grade used.
The standard also specifies a standard period where the traditional mechanical properties apply. This also depends on the steel grade used and varies from eight days to six months.
Coatings
The standard only allows zinc (Z) or zinc-iron (ZF) alloys for coating. Also, it explains the coating mass required based on the steel. If there are additional requirements, the provider and the buyer can agree on proceeding.
Buyers should note the importance of coating material thickness. It determines the metal’s ability to deform without breaking. The coating also affects how it welds together with similar materials.
Coating Finish
Spangles form when the zinc coating starts cooling down. EN 10142 notes the different coating finishes accepted for the steel products. Finish styles available also vary depending on the steel grade and designation used.
Standard spangle finishes allow for varying spangles to appear as zinc hardens. Meanwhile, minimized spangle finishes use extra work to hide marks from the observer. Other spangle requirements must be particularly indicated in the order.
Surface Treatment
Surface treatment is the extra protective layer on top of the product. The document lists methods allowed under the standard. It includes techniques like adding chemicals or applying oil. Doing so on the flat metal product prevents rust from building up.
Yet, the document allows for untreated products. This increases the risk of corrosion and is only permitted when the purchaser has requested it.
Conclusion
The requirements under EN 10142 are essential. It helps makers of flat metal products keep the quality of their work.
