Alloy Steel

Alloy Steel

Alloy steel is a type of steel that consists of iron and carbon, enhanced with one or more additional elements—such as chromium, nickel, molybdenum, anganese, or vanadium—to improve its mechanical properties.

By varying the types and amounts of these elements, engineers can customize steel to be harder, stronger, more resistant to heat, or better at fighting corrosion than standard carbon steel.

Alloy steels are generally categorized into two groups based on the weight of the added elements

Low-Alloy Steel

Contains less than 5% alloying elements. These are the most common and are used for structural parts where high strength is needed without adding excessive weight.

High-Alloy Steel

Contains more than 5% (often over 10%) alloying elements. Stainless steel is the most famous high-alloy steel, containing at least 10.5% chromium.

Common Alloying Elements & Their Effects

Chromium (Cr) : Increases hardness and corrosion resistance (Stainless Steel).

Nickel (Ni) : Improves toughness and impact resistance, especially at low temperatures.

Molybdenum (Mo) : Enhances strength at high temperatures and improves weldability.

Vanadium (V) : Increases strength and wear resistance by refining the grain structure.

Applications : Aircraft landing gear (4340), high-pressure pipelines, engine crankshafts (4140), and structural beams for skyscrapers.

Shapes : Round / Square / Flat / Hexagon