Tinplate (also known as tinplate) refers to a cold-rolled thin steel plate with a layer of metal tin on both sides. It combines the hardness and strength of steel with the weldability, corrosion resistance and bright appearance of tin. Tinplate has the advantages of being odorless, non-toxic, light in weight and easy to process and shape. Printing different patterns can also beautify the product, so it has been widely used in food canning, industry, electronic devices, chemical paint and other industries. In the production process of tinplate, after the strip steel is tinned and reflowed, in order to prevent the tin layer from oxidizing and turning yellow during storage or paint baking, and to improve the tinplate's sulfur resistance and other properties, the tinplate must be passivated. Tinplate can be produced in the form of continuous annealing (CA) or intermittent annealing (BA).

Cross section of tinned iron:

Tin plating type：

Tinplate surface condition (surface roughness)：