Hot-rolled metal goes through a mill process called hot rolling. During this process, steel is rolled in temperatures higher than steel’s re-crystallization temperatures (usually above 1700 Degrees Fahrenheit!) to achieve easier malleability and ductility. This also allows steel to be manufactured in large sizes for commercial and industrial uses. Since the manufacturing process of hot-rolled steel does not require reheating of the metal, production costs are lower, making hot-rolled steel cheaper than cold-rolled steel.
However, hot malleable metal eventually cools, and when it does, it also shrinks a bit, making final dimensions harder to control. This is one reason why hot-rolled steel is generally used in construction applications that do not require specific shapes and capacities (i.e. railroad tracks and I-beams).
Cold-rolled steel is basically the exact same as hot-rolled steel, but with the addition of further processing. The hot-rolled steel is taken to cold reduction mills for room-temperature cooling; and then the steel is put through a galvanization and/or tempers rolling process to harden and strengthen it. Cold-rolled steel allows for more dimension-control capabilities, as well as, a wider range of surface finishes.
If you own scrap steel sheet metal or other steel equipment, sell it to your local scrap metal recycling center for cash on the spot! Recycle all types of steel, including carbon, stainless, alloy, and more. Or sell items that contain high traces of steel, such as auto parts, junk cars, electronics, construction equipment, water crafts, motorcycles, and more!