AISI 4815H Alloy Steel (UNS H48150)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


The primary function of alloy steels is to increase hardenability in order to optimize mechanical properties and toughness after heat treatment. The alloy additions also reduce environmental degradation under certain specified service conditions.

AISI 4815H alloy steels are low carbon nickel-molybdenum steels. The following datasheet will provide an overview of AISI 4815H alloy steel.

Chemical Composition

The chemical composition AISI 4815H alloy steels is outlined in the following table.

Element Content (%)
Iron, Fe 94.645 - 96.03
Nickel, Ni 3.2 - 3.8
Manganese, Mn 0.30 - 0.70
Molybdenum, Mo 0.20 - 0.30
Silicon, Si 0.15 - 0.30
Carbon, C 0.12 - 0.18
Sulfur, S ≤0.040
Phosphorous, P ≤0.035

Physical Properties

The following table shows the physical properties of AISI 4815H alloy steels.

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

Mechanical Properties

The mechanical properties of AISI 4815H alloy steels are displayed in the following table.

Properties Metric Imperial
Tensile strength 1025 MPa 148700 psi
Yield strength 855 MPa 124000 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 15% 15%
Hardness, Brinell 311 311
Hardness, Vickers 329 329
Hardness, Knoop 338 338
Hardness, Rockwell C 34 34
Hardness, Rockwell B 99 99

Thermal Properties

The thermal properties of AISI 4815H 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 4815H alloy steels include the following:

  • ASTM A304
  • SAE J1268

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