Alloy steel has three categories, low alloy, medium alloy and high alloy.
Low-alloy steel has the total content of alloy elements less than 5%.
Medium alloy steel’s total alloying element content is 5%-10%.
High alloy steel goes past 10% of total alloying elements.
Alloy steel is a type of steel that requires certain other elements apart from iron and carbon. Normally alloy steel can be changed physical characteristics by adding other elements in alloy steel such as manganese, silicon, boron, chromium, vanadium and nickel. Therefore, some of low alloy steels have high strength and low alloy steel are common in the industry.