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Tinplate and Tin Free Steel DR-7M, DR-8, DR-8M,…


Tin mill products comprise of three types of steel sheets: electrolytic tinplate, tin free steel (TFS), and black plate which is uncoated steel. Tinplate is a thin sheet of steel coated with a layer of tin, while TFS is made of a steel base with a thin layer of chromium and chromium oxide deposited on it. These products have an attractive metallic sheen and offer exceptional corrosion resistance and paintability properties.

Features of Tinplate Products

Tinplate products offer exceptional features, including excellent corrosion resistance, which can be tailored by selecting the appropriate coating thickness to meet different requirements. These products also have an outstanding finishing ability, as they can be printed with a range of paints and inks. Additionally, they possess excellent weldability, making them suitable for the production of various cans, including those made by brazing. Tinplate products also exhibit remarkable processability and strength, which can be adjusted by selecting the appropriate quenching and tempering degree to meet specific processing requirements and the desired strength after forming. Lastly, the bright metallic luster of the tinplate surface offers an attractive appearance, which can be further customized by selecting substrates with different surface states to achieve products with varying levels of surface roughness.

Features of TFS Products

Tin free steel (TFS) products boast exceptional features that make them ideal for various applications. These features include excellent paint adhesion properties that far exceed those of electrolytic tinplate (ETP), making TFS suitable for producing Directly-Resist-Drawn (DRD) cans and adhesive bonded cans. Moreover, TFS exhibits outstanding heat resistance, as high-temperature baking does not cause discoloration or deterioration in its material properties. TFS also has excellent resistance to Sulphur Blackening, thanks to the metallic chromium in its composition, which makes it ideal for canning protein-rich foods like fish and helps avoid the need for expensive sulphur-resistant lacquers. Additionally, TFS offers remarkable filiform rust resistance, providing excellent under film corrosion resistance. Lastly, the coating in TFS is not amphoteric, making it highly resistant to alkalis such as detergents and dispersion colors, offering an added advantage in packing such products.

Mechanical Properties of DR Tin Mill Product

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Different Features between TFS and ETP

TFS and ETP exhibit various distinguishing features. TFS has a unique surface luster similar to metallic chromium when a similar finish is applied to the substrate steel sheet. It also displays exceptional corrosion resistance when painted and is commonly utilized with both painted surfaces, but may be used without paint internally, depending on the contents. However, it is not compatible with soldering, and its weldability is inferior to ETP, although it can be welded after the removal of its metallic coating layers. Additionally, TFS only has one standardized chromium-coated product, unlike tin which has multiple coating weights available.

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