AISI 4817H Alloy Steel (UNS H48170)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Alloy steels are designated by AISI four-digit numbers. They are more responsive to mechanical and heat treatments than carbon steels. They comprise different kinds of steels having compositions which exceed the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va in the carbon steels.

This datasheet provides more details about AISI 4817H alloy steel.

Chemical Composition

The chemical composition of AISI 4817H alloy steel is listed in the following table.

Element Content (%)
Iron, Fe 94.625 - 96.01
Nickel, Ni 3.20 - 3.80
Manganese, Mn 0.300 - 0.700
Molybdenum, Mo 0.200 - 0.300
Silicon, Si 0.150 - 0.300
Carbon, C 0.140 - 0.200
Sulfur, S ≤ 0.0400
Phosphorous, P ≤ 0.0350

Physical Properties

The following table shows the physical properties of the AISI 4817H alloy steel.

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

Mechanical Properties

The mechanical properties of AISI 4817H alloy steel are outlined in the following table.

Properties Metric Imperial
Compressive yield strength (1586 MPa mean, gears with case depth 1.1 to 1.5 mm, 60 HRC min. case hardness) 1795 MPa 260300 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
Hardness, Brinell (hot rolled and cold drawn) 187 - 229 187 - 229
Hardness, Knoop (converted from Brinell hardness) 230 230
Hardness, Rockwell B (converted from Brinell hardness) 94 94
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 15 15
Hardness, Vickers (converted from Brinell hardness) 218 218
Machinability (hot rolled and cold drawn. Based on 100% machinability for AISI 1212 steel) 60 60

Thermal Properties

The thermal properties of AISI 4817H alloy steel are outlined in the following table.

Properties Metric Imperial
Thermal conductivity (typical steel) 44.5 W/mK 309 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to AISI 4817H alloy steel include:

  • ASTM A304
  • SAE J4817
  • SAE J1268

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