AISI 4047 Alloy Steel (UNS G40470)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Alloy steels consist of a broad spectrum of steels whose compositions surpass the limitations of C, Mo, Cr, Va, Mn, Ni, Si, and B which have been determined for carbon steels. In general, these steels are more responsive to mechanical and heat treatments than carbon steels.

The following datasheet will provide more details about AISI 4072 alloy steel.

Chemical Composition

The following table shows the chemical composition of AISI 4072 alloy steel.

Element Content (%)
Iron, Fe 97.87-98.51
Manganese, Mn 0.70-0.90
Carbon, C 0.45-0.50
Molybdenum, Mo 0.20-0.30
Silicon, Si 0.15-0.35
Sulfur, S 0.040
Phosphorous, P 0.035

Physical Properties

The physical properties of AISI 4072 alloy steel are outlined in the following table.

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

Mechanical Properties

The mechanical properties of AISI 4072 alloy steel are highlighted below.

Properties Metric Imperial
Elastic modulus 190-210 GPa 27557-30458 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Hardness, Brinell 179-229 179-229
Hardness, Knoop (converted from Brinell hardness) 226 226
Hardness, Rockwell B (converted from Brinell hardness) 93 93
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) 14 14
Hardness, Vickers (converted from Brinell hardness) 214 214
Machinability (annealed and cold drawn, based on 100 machinability for AISI 1212 steel) 65 65

Thermal Properties

The thermal properties of AISI 4072 alloy steel are outlined below.

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

Other Designations

Equivalent materials to AISI 4072 alloy steel are:

  • ASTM A29
  • ASTM A331
  • ASTM A519
  • ASTM A752
  • SAE J1397
  • SAE J404
  • ASTM A322
  • SAE J412
  • SAE J770

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