AISI 4615 Alloy Steel (UNS G43350)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Alloy steel is often subdivided into low alloy steel and high alloy steels. Low alloy steels exhibit mechanical properties superior to plain carbon steels due to the addition of alloying elements such as molybdenum, nickel and chromium. High alloy steels, on the other hand exhibit high strength at elevated temperatures, and hence they are used in applications involving aggressive environments to which the steel must be resistant.

AISI 4615 is a nickel-molybdenum steel. The following datasheet will provide an overview of AISI 4615 alloy steel.

Chemical Composition

The chemical composition AISI 4615 alloy steels is outlined in the following table.

Element Content (%)
Iron, Fe 96.495 - 97.42
Nickel, Ni 1.65 - 2
Manganese, Mn 0.45 - 0.65
Molybdenum, Mo 0.20 - 0.30
Silicon, Si 0.15 - 0.30
Carbon, C 0.13 - 0.18
Sulfur, S ≤0.040
Phosphorous, P ≤0.035

Physical Properties

The following table shows the physical properties of AISI 4615 alloy steels.

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

Mechanical Properties

The mechanical properties of AISI 4615 alloy steels are displayed in the following table.

Properties Metric Imperial
Modulus of elasticity 205 GPa 29700 ksi
Bulk modulus 140 GPa 20300 ksi
Shear modulus 80 GPa 11600 ksi
Poisson’s ratio 0.29 0.29
Hardness, Brinell 170 - 212 170 - 212
Hardness, Vickers 200 200
Hardness, Knoop 213 213
Hardness, Rockwell C 11 11
Hardness, Rockwell B 91 91
Machinability 65% 65%

Thermal Properties

The thermal properties of AISI 4615 alloy steels are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient (@20°C/68°F) 11 µm/m°C 6.11 µin/in°F
Thermal conductivity 44.5 W/mK 309².°F

Other Designations

Other designations that are equivalent to AISI 4615 alloy steels include the following:

  • AMS 6290
  • AMS 6290C
  • ASTM A322
  • ASTM A331
  • ASTM A505
  • MIL SPEC MIL-S-7493
  • SAE J404
  • SAE J412
  • SAE J770


The following are the applications of AISI 4615 alloy steels:

  • Cam shafts
  • Connecting rods
  • Crankshafts
  • Gears

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