ThePipingMart Blog Grades HY-180 Alloy Steel – Composition, Properties, and Uses

HY-180 Alloy Steel – Composition, Properties, and Uses

HY 180 Steel

As an aspiring engineer or an individual who frequently works with metals, it is essential to be familiar with the different types of steel available in the market. One of the less-known varieties you might encounter is HY 180 steel. HY 180 steel is a high-strength low-alloy steel known for its remarkable toughness and tensile strength. This article will delve deeper into the composition, properties, and applications of HY 180 steel to give you a better understanding of this material.

HY 180 Steel Composition

HY 180 steel is a low-carbon, nickel-chromium-molybdenum steel with a maximum yield strength of 180 ksi or 1241 MPa. It contains around 0.2% carbon, 1.25% nickel, 0.75% chromium, and 0.5% molybdenum. Additionally, it may have small amounts of vanadium and titanium to enhance its hardenability. This unique alloy composition offers HY 180 steel exceptional toughness, weldability, and corrosion resistance.

Chemistry Content(%)
Iron, Fe 78.72
Nickel, Ni 10.0
Cobalt, Co 8.0
Chromium, Cr 2.0
Molybdenum, Mo 1.0
Carbon, C 0.13
Manganese, Mn 0.10
Silicon, Si 0.05

HY 180 Steel Physical Properties

HY 180 steel has a 7.85 g/cm³ density and a melting point of around 1425℃ or 2597℉. Its excellent strength-to-weight ratio makes it an ideal material for various applications. Additionally, this material has a coefficient of thermal expansion of 11.7 µm/m°C and a thermal conductivity of 48.1 W/mK.

Properties Metric Imperial
Density 7.75 g/cc 0.280 lb/in³

HY 180 Steel Mechanical Properties

HY 180 steel’s mechanical properties make it an excellent material for high-stress applications. Its minimum yield strength is 180 ksi, and its tensile strength ranges from 200 to 230 ksi. This material’s elongation value is around 11% in 2 inches, making it exceptionally ductile. This material also has a low coefficient of thermal expansion, indicating that it can retain its shape and dimensions under high temperatures.

Properties Metric Imperial
Tensile Strength, Ultimate 1310 MPa 190000 psi
Tensile Strength, Yield 1207 MPa 175100 psi
Elongation at Break 12% 12%
Reduction of Area 60% 60%
Modulus of Elasticity 190 GPa 27600 ksi
Charpy Impact 68.0 J 50.2 ft-lb

HY 180 Steel Uses

HY 180 steel has a broad range of applications in various industries. This steel is used in aerospace due to its exceptional strength and toughness. Additionally, it is utilized in the automotive industry, particularly in producing heavy-duty vehicle components like suspension systems and frames. This material is also ideal for structural and mechanical engineering applications where high strength and resistance to fatigue are crucial.

HY 180 Steel Hardness

HY 180 steel’s hardness depends on its heat treatment and the hard work it undergoes. It typically has a hardness range of 270 to 320 Vickers. This material’s hardness allows it to resist wear and deformation, making it ideal for industrial machinery components like gears and bearings.

HY 180 Steel Heat Treatment

The heat treatment process for HY 180 steel significantly influences its final properties. This material can be hardened through quenching and tempering to enhance its wear resistance. It can also undergo annealing to improve its machinability. HY 180 steel can also be subjected to cold working to increase strength and hardness.


HY 180 steel is a high-strength low-alloy steel that offers exceptional toughness, weldability, and corrosion resistance. Its unique composition and mechanical properties make it ideal for various industries, including aerospace, automotive, and mechanical engineering. Understanding this material’s composition, properties, and applications can help you determine when and how to use it effectively.

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