How to distinguish the steel plate, aluminum plate and copper plate from the appearance?
The plate density is much larger than the density of aluminum, two pieces of sheet metal of the same size, weight difference. In addition, can also be used to determine the two pieces of magnet sheet, magnet iron, aluminum does not attract.
Iron is a black metal (usually due to steel surface covered with a layer of black iron oxide, it was this name) is divided into cold and hot rolled steel plate plate, hot-rolled plate with oxide and cold rolled plate surface of the distinction between good, hard, bright.
Aluminum and copper are nonferrous metals. Copper is yellow and aluminium is white
