... amounts between 1.0% and 50% by weight to improve its mechanical properties.The term "alloy steel" is the standard term ... common alloyants include aluminum, cobalt, copper, cerium, niobium, titanium, tungsten, tin, zinc, lead, and zirconium.The following is a range ... of improved properties in alloy steels (as compared to carbon steels): strength, hardness, toughness ...