Steel

The steel can (also referred to as tin can) is made of a low-carbon steel coated with a very thin layer of tin on both the inner and outer surfaces. Typically, the steel can is made of three pieces: the can body, the top lid, and the bottom lid. The can body may be mechanically seamed, bonded with adhesive, welded, or soldered (2).

The tin coating protects the steel from corrosion through reactions with water, oxygen, acids, and a host of other chemicals or foods. Most often, the inner tin surface is also coated with a nonmetallic lacquer to prevent un-desired reactions of the tin with the foods.

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