AR500 steel is an abrasion resistant steel often used in mining, material handling and other high wear applications. Due to its material properties AR500 steel also makes great rifle grade targets. The steel is actually quite different that the usual Cold Rolled and Hot Rolled varieties you may find at the hardware store. AR500 steel is specifically alloyed to yield the properties that make it so useful. In addition each sheet goes through a heat treatment process to bring the hardness up to 500BHN. Hot and Cold rolled steels are shipped as-rolled and are NOT heat treated.