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High Carbon Steel Coil/Sheet
Steel that has more than 0.3 percent carbon, and is thus harder and less formable and machinable than low-carbon steel. Used mainly for cutting EDGEs, compression springs, farming and gardening equipment, and other high-wear applications.
Alloy Steel Coil/Sheet
Every steel is truly an alloy, but not all steels are called "alloy steels". Even the simplest steels are iron (Fe) (about 99%) alloyed with carbon (C) (about 0.1% to 1%, depending on type). However, the term "alloy steel" is the standard term referring to steels with other alloying elements in addition to the carbon. Common alloyants include manganese (the most common one), nickel, chromium, molybdenum, vanadium, silicon, and boron. Less common alloyants include aluminum, cobalt, copper, cerium, niobium, titanium, tungsten, tin, zinc, lead, and zirconium.