AISI 6150H Alloy Steel (UNS H61500)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Alloy steels with low carbon content in the range of 0.1-0.3% have greater weldability and formability while maintaining the strength. In these steels, the alloying elements can either form compounds or carbides instead of simply being mixed with the iron and carbon.

AISI 6150H alloy steel is a chromium-vanadium steel that can be hardened to a medium level of hardness.

The following datasheet will discuss in detail about the AISI 6150H alloy steel.

Chemical Composition

The chemical composition AISI 6150H alloy steels is outlined in the following table.

Element Content (%)
Iron, Fe 96.885 - 97.88
Chromium, Cr 0.75 - 1.2
Manganese, Mn 0.60 – 1
Carbon, C 0.47 - 0.54
Silicon, Si 0.15 - 0.30
Vanadium, V ≥0.15
Silicon, Si 0.15 - 0.30
Sulfur, S ≤0.040
Phosphorous, P ≤0.035

Physical Properties

The following table shows the physical properties of AISI 6150H alloy steels.

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

Mechanical Properties

The mechanical properties of AISI 6150H alloy steels are displayed in the following table.

Properties Metric Imperial
Tensile strength 924 MPa 134000 psi
Yield strength 800 MPa 116000 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 19.50% 19.50%
Hardness, Brinell 269 269
Hardness, Vickers 284 284
Hardness, Knoop 294 294
Hardness, Rockwell C 27 27
Hardness, Rockwell B 99 99
Machinability 55% 55%

Thermal Properties

The thermal properties of AISI 6150H alloy steels are given in the following table

Properties Metric Imperial
Thermal conductivity 46.6 W/mK 323².°F

Other Designations

Other designations that are equivalent to AISI 6150H alloy steels include the following:

  • AFNOR 50 CV 4
  • DIN 1.8159
  • UNI 5O CrV 4
  • JIS SUP 10
  • SS 2230
  • B.S. 735 A 50
  • ASTM A304
  • SAE J1268
  • B.S. En. 47


The following are the list of applications of AISI 6150H alloy steels:

  • Spline shafts
  • Valve springs
  • Pump parts
  • Piston rods
  • Automotive leaf springs

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