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What material is the spare tire cover plate in the trunk of the car?

Steel plate or aluminum alloy plate. According to relevant public information, the spare tire cover plate of automobile trunk is usually made of steel plate or aluminum alloy plate, and its material can be different according to different models. Steel spare tire cover plate has high strength and corrosion resistance, but it is heavy. Aluminum spare tire cover plate is light in weight, but low in strength and easy to be corroded.