ThePipingMart Blog Grades AMS 7238 – Composition, Properties, and Uses

AMS 7238 – Composition, Properties, and Uses

AMS 7238

Materials and alloys are essential components in various industries, each with unique properties and uses. One such material is AMS 7238, an alloy primarily used in the aerospace and automotive industries. This blog post aims to provide comprehensive information about AMS 7238, including its composition, physical and mechanical properties, uses, hardness, and heat treatment methods.

AMS 7238 Composition

AMS 7238 is a low-carbon steel alloy that contains chromium, molybdenum, and vanadium. Its exact composition is as follows: Chromium (Cr) 0.80-1.10%, Molybdenum (Mo) 0.25-0.35%, Vanadium (V) 0.10-0.20%, Carbon (C) 0.18-0.23%, Manganese (Mn) 0.70-0.90%, Silicon (Si) 0.15-0.35%, Phosphorus (P) 0.035%, Sulfur (S) 0.040%. The varying amounts of these elements give the material its unique properties.

AMS 7238 Physical Properties

AMS 7238 has a density of 7.85 g/cm³, a melting point of 1460°C (2660°F), and a thermal expansion coefficient of 11.7 x 10^-6/°C. This alloy also exhibits good corrosion resistance, making it suitable for environments exposed to various elements. It is also highly durable and can withstand high temperatures.

AMS 7238 Mechanical Properties 

With a tensile strength of 1350 MPa and a yield strength of 1170 MPa, AMS 7238 possesses excellent mechanical power. Its elongation at break is 14%, and the modulus of elasticity is 210 GPa. This alloy also exhibits exceptional toughness, even in extreme conditions.

AMS 7238 Uses

AMS 7238’s properties make it well-suited for various industrial applications, especially in the aerospace and automotive industries. It is commonly used in critical aircraft components such as landing gears, turbine blades, and engine mounts. The automobile industry also uses this alloy for engine parts, transmission components, and suspension systems.

AMS 7238 Hardness 

AMS 7238 has a Rockwell hardness of 41 HRC, which means it is relatively resistant to indentation from heavy forces. This high hardness level is attributed to chromium, molybdenum, and vanadium.

AMS 7238 Heat Treatment

The heat treatment of AMS 7238 involves quenching and tempering. The material is first heated to a temperature range of 840-870°C (1544 – 1598°F) before cooling rapidly in water or oil. The material is tempered at 540-650°C (1004-1202°F) for three to four hours. This heat treatment process ensures that the material retains its strength and toughness.


AMS 7238 is a low-carbon steel alloy with corrosion resistance, durability, and exceptional mechanical properties. Its composition, physical and mechanical properties, uses, hardness and heat treatment methods are essential information for anyone who uses this alloy. The aerospace and automotive industries primarily benefit from its excellent properties, but other sectors can also use it. Overall, AMS 7238 is an alloy that has proven to be a perfect choice for various components that require strength, durability, and toughness.

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