ThePipingMart Blog Grades AMS 6448 Alloy Steel – Composition, Properties, and Uses

AMS 6448 Alloy Steel – Composition, Properties, and Uses

AMS 6448

AMS6448 is a high-strength steel alloy known for its impressive mechanical and physical properties. This alloy is often used in aerospace manufacturing because of its excellent strength-to-weight ratio, toughness, and durability. In this blog post, we will dive deep into the different aspects of AMS 6448, including its composition, physical and mechanical properties, and typical uses.

What is AMS 6448?

AMS 6448 (also known as 6150 Alloy Steel) is a specification standard of utmost importance in the aerospace industry. This standard outlines requirements for the heat treatment and material properties of high-strength alloy steels used for critical aerospace applications. Such alloys must withstand high operating temperatures, variable stresses and strains, and exposure to harsh environments. AMS6448 ensures that these alloys are produced with the highest possible quality and consistency to meet the stringent demands of the aerospace industry. With AMS6448 as a guidepost, aeroplane manufacturers and other companies in the aerospace sector can be confident that they are using the very best materials for their most important applications.

AMS 6448 Composition

AMS 6448 includes iron, carbon, nickel, chrome, and molybdenum. The precise composition can vary depending on the manufacturer, but the basic formula usually consists of 0.3% carbon, 1.5% nickel, 0.75% chrome, and 0.4% molybdenum. AMS 6448 has a unique composition that provides it with impressive properties.

Element Content (%)
Iron, Fe 97.095 – 97.72
Chromium, Cr 0.800 – 1.10
Manganese, Mn 0.7 – 0.9
Carbon, C 0.480 – 0.530
Silicon, Si 0.150 – 0.3
Vanadium, V ≥ 0.150
Sulfur, S ≤ 0.04
Phosphorous, P ≤ 0.0350

AMS 6448 Physical Properties

AMS 6448 offers excellent physical properties, including high strength, corrosion resistance, and thermal stability. This alloy’s excellent strength-to-weight ratio makes it ideal for aircraft manufacturing. It also exhibits good resistance to corrosion, making it suitable for use in harsh environments. AMS 6448 is also thermally stable, meaning it can withstand high temperatures without suffering from warping or cracking.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³

AMS 6448 Mechanical Properties

The mechanical properties of AMS 6448 are equally impressive. This alloy has a tensile strength of up to 220 ksi, yield strength of up to 200 ksi, and a hardness of 35-45 HRC. It also has good fatigue resistance and can withstand high-stress applications. AMS 6448 has a unique microstructure that provides impressive mechanical properties, making it an ideal choice for various applications.

Properties Metric Imperial
Tensile strength, ultimate 670 MPa 97200 psi
Tensile strength, yield 415 MPa 60200 psi
Izod impact 27 J 19.9 ft-lb
Modulus of elasticity 190-210 GPa 27557-30458 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Poissons ratio (calculated) 0.27 – 0.30 0.27-0.30
Elongation at break (in 50 mm) 23% 23%
Hardness, Brinell 197 197
Hardness, Vickers (converted from Brinell hardness) 207 207
Hardness, Knoop (converted from Brinell hardness) 219 219
Hardness, Rockwell B (converted from Brinell hardness) 92 92
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) 13 13
Machinability (annealed and cold drawn. Based on 100% machinability for AISI 1212 steel) 55 55

AMS 6448 Equivalents

AMS 6448 AMS 6455C ASTM A519 (6150) SAE J404 (6150) SS 2230
AMS 6448C AMS 7301 ASTM A752 (6150) SAE J412 (6150) B.S. 735 A 50
AMS 6450 ASTM A29 (6150) ASTM A829 AFNOR 50 CV 4 B.S. En. 47
AMS 6450C ASTM A322 (6150) MIL S-8503 DIN 1.8159
AMS 6455 ASTM A331 (6150) SAE J1397 (6150) UNI 5OCrV 4

AMS 6448 Uses

AMS 6448 is commonly used in the aerospace industry to manufacture aircraft structures, engine components, and landing gear. It also produces high-performance vehicles such as sports cars and racing bikes. AMS 6448 is also used to manufacture industrial machinery, such as turbines, pumps, and compressors. Its impressive mechanical properties make it a suitable choice for various applications that require high strength, durability, and resistance to wear and tear.

AMS 6448 Hardness

The hardness of AMS 6448 ranges from 35-45 HRC, which is considered high compared to other steel alloys. The high hardness of AMS 6448 is due to its unique composition and microstructure, which provides it with excellent wear resistance and toughness. This alloy can withstand high-stress applications without sacrificing its mechanical or physical properties, making it an ideal choice for critical applications.

AMS 6448 Heat treatment

AMS 6448 can be heat-treated to improve its mechanical and physical properties further. Heat treatment involves heating the alloy to a specific temperature and cooling it slowly. This process helps to enhance the alloy’s strength, toughness, and hardness, making it ideal for high-stress applications. Depending on the application, AMS 6448 may be heat-treated to a different temperature to achieve the desired properties.


In conclusion, AMS 6448 material is an impressive steel alloy with excellent mechanical and physical properties. This alloy is commonly used in aerospace manufacturing aircraft components and structures. Still, it is also used to produce high-performance vehicles and industrial machinery. Its unique composition and microstructure provide impressive properties, including high strength, corrosion resistance, thermal stability, and wear resistance. AMS 6448 can also be heat-treated to enhance its properties for specific applications. Overall, if you’re looking for a high-strength steel alloy that can withstand high-stress applications, AMS 6448 may be the perfect choice.

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