Aluminum foil is an alloy of iron and tin, with tin plating.
It is mainly used for packaging consumer food in iron boxes and cans. Due to the fact that tinplate combines the strength of steel, the shaping and material properties of tin, as well as the corrosion resistance, solderability and aesthetic appeal of tin, it has corrosion resistance, is non-toxic, has high strength and ductility.
Canned steel is classified according to its thickness and tin coating quantity. Generally speaking, in order to save costs, the current industrial consumption will reduce the thickness of the iron and tin coatings while ensuring the reliable packaging strength.
One is to reduce the use of tin, or even eliminate it (using chrome-plated iron instead). Starting from the hot-dip galvanized tinplate in the 1950s and evolving to the electroplated tinplate today, we have not yet seen the application of hot-dip galvanized tinplate in canned food in China.
Secondly, reduce the thickness of the tin-plated substrate. This is a common aspiration. Currently in China, 0.15 meters per meter of tinplate was once used to manufacture caps. Some cold-rolled thin sheet companies have announced that they can supply cold-rolled thin sheet with a thickness of 0.12 meters per meter for the hat manufacturing industry. Therefore, high-hardness tinplate sheets with secondary cold-rolled thin base material are the development direction for the can (cap) manufacturing industry.
