Steel is an alloy of iron and carbon, along with other elements like manganese, silicon, and phosphorus. Steel is classified based on its carbon content as either plain carbon/non-alloy steel or alloy steel. Plain carbon steels contain only carbon as the alloying element, while alloy steels contain additional elements. Plain carbon steels are further divided into low-carbon (<0.25% C), medium-carbon (0.25-0.6% C), and high-carbon (>0.6% C) types. Alloy steels add elements like chromium, nickel, and molybdenum to improve properties such as strength, hardness, wear resistance, and corrosion resistance. Common