Low-alloy steels contain specified amounts of chromium, nickel or molybdenum to the carbon to enhance harden-ability and toughness. Low-alloy steels are most commonly used for components in the oil and gas, and pump and valve industries, but are also suitable for military vehicles and earth-moving and construction equipment. Common elements added carbon steels are Nickel (Ni), Chromium (Cr) and Molybdenum (Mo). Nickel is added to resist corrosion and provide strength, stability and toughness. Chromium is added to resist wear and corrosion and help the steel to increase strength and harden-ability. Molybdenum is added to withstand temperatures and elevate the strength and harden-ability of the steel.