ThePipingMart Blog Grades AMS 6294 Alloy Steel – Composition, Properties, and Uses

AMS 6294 Alloy Steel – Composition, Properties, and Uses

AMS 6294

Are you looking to expand your knowledge of AMS6294? This alloy steel is popular in various aerospace, defence, and automotive industries. This blog post will dive into everything you need to know about this exceptional material, including its composition, physical and mechanical properties, uses, hardness, and heat treatment.

What is AMS 6294?

AMS 6294 (also known as AISI 4620 Alloy Steel) is a specification developed by the Society of Automotive Engineers (SAE) that outlines aircraft-quality steel bars and forgings requirements. This specification covers a range of alloy steels, including nickel-chrome-molybdenum alloys and chromium-molybdenum-vanadium alloys. AMS6294 provides strict guidelines for these materials’ manufacturing processes, heat treatment, and mechanical properties to ensure they meet the rigorous standards required for use in aircraft structures and components. With aviation safety being of utmost importance, the careful attention paid to the composition and production of these materials is essential to maintaining the integrity of our skies.

AMS 6294 Composition

AMS6294, low alloy steel, contains Carbon, Manganese, Silicon, Nickel, Chromium, Molybdenum, Vanadium, and Phosphorus. These elements, in balanced quantities, make the steel incredibly strong and durable.

Element Content (%)
Iron, Fe 96.405 – 97.38
Nickel, Ni 1.65 – 2
Manganese, Mn 0.450 – 0.650
Molybdenum, Mo 0.2 – 0.3
Carbon, C 0.170 – 0.220
Silicon, Si 0.150 – 0.350
Sulfur, S  0.04
Phosphorous, P  0.0350

AMS 6294 Physical Properties

The physical properties of AMS 6294 are impressive. The alloy steel has a density that ranges from 7.85 to 7.87 g/cm3. Its melting point ranges from 1424 °C to 1466 °C, with a thermal conductivity of 29.4 W/mK. The thermal expansion coefficient of AMS 6294 alloys is about 12.1 µm/m°C.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in3
Melting point 1421°C 2590°F

AMS 6294 Mechanical Properties

AMS 6294 exhibits incredibly superior mechanical properties. Its tensile strength ranges from 1310 MPa to 1830 MPa, and the yield strength ranges from 1090 MPa to 1400 MPa. The alloy steel has a high elongation of up to 14%, which allows it to resist shocks and vibrations even under extreme conditions.

Properties Metric Imperial
Tensile strength, ultimate 510 MPa 74000 psi
Tensile strength, yield 370 MPa 53700 psi
Modulus of elasticity 190-210 GPa 27557-30458 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel)) 80 GPa 11600 ksi
Poissons ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 31.30% 31.30%
Reduction of area 60.30% 60.30%
Hardness, Brinell 149 149
Hardness, Knoop (converted from Brinell hardness) 169 169
Hardness, Rockwell B 80 80
Hardness, Vickers (converted from Brinell hardness) 155 155
Machinability (hot rolled and cold drawn. Based on 100 machinability for AISI 1212 steel) 65 65

AMS 6294 Equivalents

  • AMS 6294
  • AMS 6294C
  • ASTM A29 (4620)
  • ASTM A322 (4620)
  • ASTM A331 (4620)
  • ASTM A505
  • ASTM A519 (4620)
  • ASTM A535 (4620)
  • ASTM A646 (4620-3)
  • ASTM A752 (4620)
  • ASTM A829
  • SAE J1397 (4620)
  • SAE J404 (4620)
  • SAE J412 (4620)
  • MIL SPEC MIL-S-7493 (A4620)

AMS 6294 Uses

AMS 6294 can be used in various applications. Its strength, durability, and cost-effectiveness make it a top choice in the aerospace and defence industries for structures and parts that require high strength and toughness. The alloy steel is also used in the automotive industry, particularly in crankshafts and yokes.

AMS 6294 Hardness

AMS 6294 is one of its most significant benefits. Its hardness ranges between 35 and 46 HRC, making it ideal for heavy-duty applications and high-stress environments.

AMS 6294 Heat treatment

AMS 6294 can undergo heat treatment processes known as normalizing, annealing, hardening, and tempering. These processes improve the strength and durability of the material, making it an excellent choice for applications that require high strength and toughness.


In summary, AMS 6294 material is a versatile, durable alloy steel with exceptional physical and mechanical properties. Its high strength, hardness, and heat treatment capabilities are ideal for various aerospace and automotive industries. Understanding this material’s composition, physical and mechanical properties, use, hardness, and heat treatment is essential to making informed decisions about its use in various applications. If you’re looking for a reliable alloy steel for your next project or production, consider AMS 6294.

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