ThePipingMart Blog Grades AMS 6484 Alloy Steel – Composition, Properties, and Uses

AMS 6484 Alloy Steel – Composition, Properties, and Uses

AMS 6484

Regarding materials used in aerospace industries, SAE – AMS 6484 is a popular option. But what exactly is it, and why is it such a common choice among manufacturers in the aerospace industry? This post will examine AMS 6484 material and explore its composition, physical and mechanical properties, uses, hardness, and heat treatment.

What is AMS 6484?

AMS 6484 (also known as SAE – AISI 4340 Alloy Steel) metal is a high-strength alloy steel used in various industries for its remarkable durability and toughness. What sets this metal apart from others is its exceptional resistance to wear and tear, making it a reliable choice for industrial applications that require materials to withstand extreme conditions. AMS6484 is typically employed in manufacturing aircraft landing gear, other critical aircraft components, industrial machinery parts, automotive components, and military equipment. The composition of the metal also allows for excellent machinability, making it easier to shape and form into the required specifications. Whether for a commercial airliner or a military vehicle, AMS 6484 material has proven to be a top-of-the-line material that provides high-strength and reliable performance in the most challenging environments.

What Form is AMS 6484 Available at Piping Mart?

  • Alloy Steel AISI 4340 Bars

AMS 6484 Composition

AMS 6484 steel is a type of steel that falls under alloy steel. It comprises carbon, manganese, chromium, molybdenum, and vanadium elements. The precise composition meets the SAE 4340 and the AMS-S-5000 specifications.

Element Content (%)
Iron, Fe 95.195 – 96.33
Nickel, Ni 1.65 – 2.00
Chromium, Cr 0.700 – 0.900
Manganese, Mn 0.600 – 0.800
Carbon, C 0.370 – 0.430
Molybdenum, Mo 0.200 – 0.300
Silicon, Si 0.150 – 0.300
Sulfur, S  0.0400
Phosphorous, P  0.0350

AMS 6484 Physical Properties

AMS 6484 plate exhibits excellent physical properties, including high resistance to wear, fatigue, and impact. It has a density of 7.85 g/cm^3, similar to carbon steel. Its thermal conductivity is approximately 12 W/(m*K), lower than copper and aluminium but higher than titanium.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³
Melting point 1427°C 2600°F

AMS 6484 Mechanical Properties

One of the key benefits of AMS 6484 sheet is its outstanding mechanical properties, which make it an excellent choice for applications that require high tensile strength, hardness, and toughness. The tensile strength of AMS 6484 is around 2280 MPa, which is higher than titanium and aluminium alloys. Its yield strength is approximately 1525 MPa. AMS 6484 is also known for its excellent ductility and impact resistance, making it an ideal choice for aviation and defence applications.

Properties Metric Imperial
Tensile strength 745 MPa 108000 psi
Yield strength 470 MPa 68200 psi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break 22% 22%
Reduction of area 50% 50%
Hardness, Brinell 217 217
Hardness, Knoop (converted from Brinell hardness) 240 240
Hardness, Rockwell B (converted from Brinell hardness) 95 95
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 17 17
Hardness, Vickers (converted from Brinell hardness) 228 228
Machinability (annealed and cold drawn. Based on 100 machinability for AISI 1212 steel.) 50 50

AMS 6484 Equivalents

AMS 6359 AMS 6454 ASTM A331 (4340) ASTM A711 SAE J1397 (4340)
AMS 6409 ASTM A29 (4340) ASTM A506 (4340) ASTM A752 (4340) SAE J404 (4340)
AMS 6414 ASTM A320 (L43) ASTM A519 (4340) ASTM A829 SAE J412 (4340)
AMS 6415 ASTM A322 (4340) ASTM A646 (4340-7) MIL S-5000

AMS 6484 Specifications

Country USA Britain Britain Japan
Standard ASTM A29 EN 10250 BS 970 JIS G4103
Grades 4340 36CrNiMo4/
EN24/817M40 SNCM 439/SNCM8

AMS 6484 Uses

AMS 6484 steel wire is a popular material used in the aerospace industry and can be found in applications such as aircraft landing gear, turbine shafts, and structural components. It is also used in the defence industry for manufacturing missile components and undercarriage systems.

AMS 6484 Hardness

AMS 6484 steel bars exhibits a high hardness level, making it suitable for applications that require a strong and durable material. The material can achieve a Rockwell hardness of up to 50-54 HRC.

AMS 6484 Heat treatment

AMS 6484 material can be heat-treated to enhance its mechanical properties, such as increasing tensile strength and hardness. Heat treatment involves heating the material to a specific temperature, holding it at that temperature, and then cooling it to a specific rate. This process can improve the material’s microstructure, making it stronger and more durable.


AMS 6484 steel is a high-performance material widely used in the aviation and defence industries. Its unique composition and properties make it an ideal choice for applications that demand high tensile strength, hardness, and toughness. Understanding the physical and mechanical properties of AMS 6484 material can help manufacturers in these industries select the best material for their specific applications. With high wear, fatigue, and impact resistance, AMS 6484 can be an excellent option for a wide range of applications.

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