AISI 4620H Alloy Steel (UNS H46200)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Alloy steels those that are added with alloying elements to achieve certain material properties. Alloying elements are added in lower quantities to increase hardenability or strength, and in larger quantities to achieve special properties like high temperature stability or corrosion resistance.

AISI 4620H is a nickel-molybdenum steel. The following datasheet provides an overview of AISI 4620H alloy steel.

Chemical Composition

The chemical composition AISI 4620H alloy steels is outlined in the following table.

Element Content (%)
Iron, Fe 96.295 - 97.58
Nickel, Ni 1.55 - 2
Manganese, Mn 0.35 - 0.75
Molybdenum, Mo 0.20 - 0.30
Carbon, C 0.17 - 0.23
Silicon, Si 0.15 - 0.35
Sulfur, S ≤0.040
Phosphorous, P ≤0.035

Physical Properties

The following table shows the physical properties of AISI 4620H alloy steels.

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

Mechanical Properties

The mechanical properties of AISI 4620H alloy steels are displayed in the following table.

Properties Metric Imperial
Tensile strength 600 MPa 87000 psi
Yield strength 380 Mpa 55100 psi
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
Elongation at break 30.70% 30.70%
Reduction of area 68% 68%
Hardness, Brinell 192 192
Hardness, Vickers 201 201
Hardness, Knoop 214 214
Hardness, Rockwell C 11 11
Hardness, Rockwell B 91 91
Machinability 65 65

Thermal Properties

The thermal properties of AISI 4620H alloy steels are given in the following table

Properties Metric Imperial
Thermal conductivity 44.5 W/mK 309².°F

Other Designations

Other designations that are equivalent to AISI 4620H alloy steels include the following.

  • ASTM A304
  • SAE J1268


AISI 4620H alloy steels are widely used in automotive gears and other corrosive environment applications.

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