ThePipingMart Blog Grades AMS 6414 Alloy Steel – Composition, Properties and Uses

AMS 6414 Alloy Steel – Composition, Properties and Uses

AMS 6414

If you are in the manufacturing industry, you must have heard about SAE – AMS 6414. AMS 6414 is a type of steel material that boasts high strength and durability and is often used in applications where strength and toughness are crucial. This post will discuss AMS 6414’s composition, physical and mechanical properties, potential uses, and the heat treatment process required to improve its hardness. By the end of this post, you will have a deeper understanding of AMS 6414 and why it is a popular material in the manufacturing industry.

What is AMS 6414?

AMS 6414 (also known as SAE – AISI 4340 Alloy Steel) metal is a type of steel that has become increasingly popular among engineers and manufacturers for its high strength, toughness, and wear resistance. It is a low-alloy, high-carbon material that contains small amounts of chromium, molybdenum, and vanadium, which gives it its outstanding properties. AMS6414 metal is commonly used to manufacture high-performance components such as aircraft landing gear, shafts, gears and structural parts. Its ability to maintain its properties even in extreme conditions makes it the go-to material for demanding applications where reliability, precision and durability are crucial. Whether you’re building a fighter jet or a race car, AMS6414 metal is the steel of choice for the most demanding engineering challenges.

What Form is AMS 6414 Available at Piping Mart?

  • Alloy Steel AISI 4340 Bars

AMS 6414 Composition

AMS 6414 sheet is an alloy steel that consists of carbon, manganese, chromium, molybdenum, vanadium, and nickel. The carbon content ranges from 0.36% to 0.43%, manganese ranges from 0.75% to 1.00%, and the remaining elements comprise the rest of AMS 6414’s composition. The balance of these elements makes AMS 6414 a high-strength material with long-lasting durability.

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 6414 Physical Properties

AMS 6414 steel bars is known for its excellent physical properties. It has a density of 7.85 g/cm³, a melting point of 1416 °C, and a specific heat capacity of 0.48 J/g°C. Additionally, it has a thermal conductivity of 44.5 W/m°C, making it an excellent heat conductor.

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

AMS 6414 Mechanical Properties

AMS 6414 tubes has outstanding mechanical properties. It has a yield strength of 930 MPa, and a tensile strength of 1080 MPa, with a reduction of 50% and an elongation of 12%. The outstanding mechanical properties of AMS 6414 make it a material of choice for parts subjected to extreme wear and tear, such as gears, axles, and other high-stress 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 6414 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 6414 Specifications

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

AMS 6414 Uses

AMS 6414 steel sheet is commonly used in the automobile and aviation industries due to its high strength and durability. It is often used for manufacturing gears, axles, and other high-stress engine parts. Additionally, it can be used to manufacture drill bits, saw blades, and cutting tools due to its excellent wear and abrasion resistance.

AMS 6414 Hardness

AMS 6414 has a hardness range of 244 to 300 HB. This means that AMS 6414 can be machined after heat treatment to achieve desired hardness levels suitable for various applications.

AMS 6414 Heat treatment

To improve the hardness of AMS 6414, it undergoes heat treatment. Two common types of heat treatments are annealing and quenching and tempering. Annealing involves heating the material between 850°C to 900°C and cooling the material slowly to room temperature. Quenching and tempering are processes whereby AMS 6414 is heated to a temperature between 870°C and 925°C, quenched in water, and then tempered in a furnace for an hour. Heat treatment improves the material’s mechanical and physical properties, making it suitable for various applications.


AMS 6414 material is a high-strength alloy steel widely used in manufacturing for its strength, durability, and excellent mechanical properties. Its composition, physical and mechanical properties, heat treatment process, and potential uses make it an ideal material for manufacturing gears, axles, and high-stress engine parts. If you plan to use AMS 6414 in your manufacturing process, it is important to understand its properties and heat treatment process to achieve the desired results.

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