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Iron is the most widely used type of metal. The main reason is that the presence of iron is relatively common, and processing is cheaper. Pure iron is rarely used in industry, and some items such as needles, iron wire and metal plates are generally made of sodium. Cast iron is very hard, but it is also very brittle. If iron contains more than 1.9% carbon, this iron is called cast iron or pig iron. If the carbon content is less than 1.9%, it is called steel. Various steels are classified according to their mechanical properties (tensile strength), chemical composition (carbon content), shaped shapes (such as plate or U-section), and methods of use (such as spring steel). The steel plate (ie, iron sheet) is a packaging material composed of a thin steel plate and a tin layer plated by a hot dip method and can be screen printed. The steel plate is made of ingots and can also be plated with tin. Due to the high price of tin, some are replaced with chrome plating. Aluminum is an earthy metal, and aluminum can be used to extract aluminum. When aluminum is exposed to air, an oxide layer is formed on the surface to prevent further aluminum corrosion. Aluminum is treated with anodization, and the resulting anodized aluminum can further protect the alumina layer. The anodized layer is 8^20 microns thick, and the screen printing method is ideal for printing.