ThePipingMart Blog Grades AMS 4148 Aluminum Alloy – Composition, Properties and Uses

AMS 4148 Aluminum Alloy – Composition, Properties and Uses

AMS 4148

Metals are crucial daily, and the aerospace industry relies heavily on them. AMS4148, known as Alloy Steel Bars and Forgings, is a widely used metal alloy, but many people don’t know much about it. This blog post provides a comprehensive guide to AMS 4148, including its composition, physical and mechanical properties, uses, hardness, and heat treatment. By the end of this post, you will better understand this alloy and its applications in aerospace and beyond.

What is AMS 4148?

AMS 4148 (also known as 7175 Aluminum Alloy) is a standard developed by the Society of Automotive Engineers (SAE) that outlines the parameters for the tone of voice used by aircraft pilots and air traffic controllers during radio communications. Being a subject matter expert on AMS4148 requires a deep understanding of the technical nuances involved in establishing clear communication between two miles apart parties while operating at high speeds through the air. With years of experience and a thorough knowledge of the standard, an expert in AMS4148 can help ensure that aircraft communications are consistently delivered with clarity, efficiency, and safety. The standard is essential for air travel and requires precision and accuracy to successfully communicate between pilots and air traffic controllers.

AMS 4148 Composition

AMS 4148 belongs to the AISI 4340 family of steels, which are high-strength, low-alloy (HSLA) steels. The composition of AMS 4148 includes carbon (0.38-0.43%), manganese (0.60-0.80%), silicon (0.15-0.35%), chromium (0.70-0.90%), molybdenum (0.20-0.30%), and nickel (1.65-2.00%). Adding these elements enhances the mechanical properties of the alloy and provides it with excellent toughness, fatigue resistance, and wear resistance.

Element Content (%)
Aluminum, Al 90.0
Zinc, Zn 5.6
Magnesium, Mg 2.5
Copper, Cu 1.6
Chromium, Cr 0.23

AMS 4148 Physical Properties

AMS 4148 has a density of 2.8 g/cm³ and a melting point of 816°C. The alloy exhibits good thermal conductivity and electrical conductivity, making it suitable for some electrical and electronic applications. Moreover, AMS 4148 has good machinability and can be formed into various shapes using standard techniques.

Properties Metric Imperial
Density 2.6-2.8 g/cm³ 0.0939-0.1011 lb/in³
Melting point 482°C 900°F

AMS 4148 Mechanical Properties

AMS 4148 has excellent mechanical properties, making it ideal for high-stress applications in aerospace, automotive, and other industries. The alloy has a tensile strength of 1590 MPa and a yield strength of 1310 MPa. It also has a high melting point and good corrosion resistance, enhancing its mechanical performance. Additionally, AMS 4148 has good flexibility, making it easy to fabricate and machine.

Properties Metric Imperial
Elastic modulus 70-80 Gpa 10152-11603 ksi
Poisson’s ratio 0.33 0.33

AMS 4148 Uses

The high strength, toughness, and wear resistance of AMS 4148 make it suitable for various applications in aerospace and other industries. AMS 4148 is commonly used to manufacture gears, bearings, shafts, fasteners, landing gear components, and other critical parts for the aerospace industry. It is also used in the automotive, mining, and oil and gas industries, where high-stress and wear-resistant materials are required.

AMS 4148 Hardness and Heat Treatment

AMS 4148 can achieve high hardness through heat treatment. The alloy can be hardened by quenching or annealing, and tempering. The hardness of AMS 4148 can range from 20 to 45 HRC, depending on the heat treatment process. The optimal heat treatment process depends on the specific application requirements and the desired mechanical properties.


AMS 4148 material is a high-strength, low-alloy steel alloy widely used in aerospace, automotive, and other industries. Its excellent mechanical and physical properties and durability make it ideal for various high-stress applications. By understanding its composition, physical and mechanical properties, uses, hardness, and heat treatment, we can appreciate its crucial role in manufacturing vital parts. Whether you’re an engineer, a manufacturer, or an enthusiast, it’s essential to understand the properties of metals like AMS 4148 to make informed decisions.

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