ThePipingMart Blog Grades AMS 4174 Aluminum Alloy – Composition, Properties and Uses

AMS 4174 Aluminum Alloy – Composition, Properties and Uses

AMS 4174

If you work in the aerospace industry, you may be familiar with AMS 4174. This specification covers high-strength, corrosion-resistant steel commonly used in aerospace applications. Whether you are an engineer, machinist, or materials specialist, understanding the composition and properties of AMS 4174 is essential for selecting the right material for your projects. This blog post provides a comprehensive guide to AMS 4174, including its composition, physical and mechanical properties, uses, hardness, and heat treatment.

What is AMS 4174?

AMS 4174 (also known as 7075 Aluminum Alloy) is a specification that outlines the requirements for aluminum alloys used in high-strength applications. This standard is essential in industries such as aerospace and defense, where strength and durability are critical. Engineers and manufacturers rely on the strict guidelines of AMS4174 to ensure that their products meet the necessary strength requirements. By adhering to this specification, companies can guarantee that their aluminium alloys can withstand harsh environments, extreme temperatures, and high-stress levels. The demand for high-performance materials continues to grow, making AMS 4174 an essential part of the manufacturing process for many industries.

What Form is AMS 4174 Available at Piping Mart?

  • Pipes
  • Tubing

AMS 4174 Composition

AMS 4174 is a high-strength, corrosion-resistant steel composed mainly of iron, chromium, and nickel. Its composition also includes small amounts of carbon, manganese, phosphorus, sulfur, and silicon. The specific chemical composition of AMS 4174 is as follows:

  • Iron (Fe): 70%
  • Chromium (Cr): 17.5-20.5%
  • Nickel (Ni): 7.5-10.5%
  • Carbon (C): 0.05-0.15%
  • Manganese (Mn): 0.50% max
  • Phosphorus (P): 0.04% max
  • Sulfur (S): 0.03% max
  • Silicon (Si): 0.50% max

AMS 4174 Physical Properties

AMS 4174 has excellent physical properties that make it ideal for aerospace applications. Its density is 7.85 g/cm³, and its melting point is between 1399 and 1454°C. The thermal expansion coefficient of AMS 4174 is 13.5 x 10-6/K, and its thermal conductivity is 14 W/mK. AMS 4174 is also highly corrosion-resistant, making it suitable for harsh environments.

Physical Properties Metric English Comments
Density 2.81 g/cc 0.102 lb/in³ AA; Typical

AMS 4174 Mechanical Properties

In addition to its excellent physical properties, AMS 4174 has outstanding mechanical properties. Its ultimate tensile strength is 1450 MPa, and its yield strength is 1310 MPa. The elongation at break of AMS 4174 is 10%, and its hardness is 40 HRC. AMS 4174 also has good fatigue strength and is resistant to stress corrosion cracking.

AMS 4174 Uses

AMS 4174 is used in various aerospace applications, including aircraft engines, landing gears, and fasteners. It’s high strength and corrosion resistance make it ideal for these applications, as it is important that these parts can withstand extreme conditions. AMS 4174 is also used in marine and chemical processing industries where resistance to corrosion and high strength are essential.

AMS 4174 Hardness

The hardness of AMS 4174 is 40 HRC, which means it is a hard material. The hardness of a material affects its ability to resist wear and deformation. Hard materials are more wear-resistant and can withstand higher pressures and loads than softer materials.

AMS 4174 Heat treatment

Heat treatment is essential to improve the mechanical properties of AMS 4174. The recommended heat treatment for AMS 4174 is solution annealing at 1040 to 1080°C for 30 minutes to two hours, followed by air cooling. This heat treatment will improve the material’s strength, flexibility, and toughness. Overheating of AMS 4174 should be avoided, as this could lead to grain growth and reduced toughness.


In conclusion, understanding the composition, properties, and applications of AMS 4174 is essential for selecting the right material for aerospace and other industries. AMS 4174 has excellent physical and mechanical properties, making it suitable for harsh environments and applications requiring high strength and corrosion resistance. Its recommended heat treatment is solution annealing, which enhances its mechanical properties. Considering the factors discussed in this blog post, you can select the right material for your next project and achieve the desired results.

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