AISI 1144 Carbon Steel (UNS G11440)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Steels taht contain carbon as the primary alloying element are referred to as carbon steels. They also contain 0.4% of silicon and 1.2% of manganese. Residual elements such as molybdenum, chromium, nickel, copper, and aluminium are present in traces.

The following datasheet gives an overview of the chemical composition and mechanical properties of AISI 1144 carbon steel.

Chemical Composition

The following table shows the chemical composition of AISI 1144 carbon steel.

Element Content (%)
Iron, Fe 97.50 - 98.01
Manganese, Mn 1.35 - 1.65
Sulfur, S 0.240 - 0.330
Carbon, C 0.40 - 0.480
Phosphorous, P 0.040

Physical Properties

The physical properties of AISI 1144 carbon steel are tabulated below.

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

Mechanical Properties

The mechanical properties of cold drawn AISI 1144 carbon steel are outlined in the following table.

Properties Metric Imperial
Tensile strength 745 MPa 108000 psi
Yield strength 620 MPa 89900 psi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80.0 GPa 11600 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break 10% 10%
Reduction of area 30% 30%
Hardness, Brinell 217 217
Hardness, Knoop (converted from Brinell hardness) 240 240
Hardness, Rockwell B (converted from Brinell hardness) 95 95
Hardness, Rockwell C 17 17
Hardness, Vickers (converted from Brinell hardness) 228 228

Thermal Properties

The thermal properties of AISI 1144 carbon steel are given below.

Properties Metric Imperial
Thermal conductivity (typical steel) 49.8 W/mK 346 BTU in/hr.ft2.°F

Other Designations

Other designations that are equivalent to AISI 1144 carbon steel include:

  • ASTM A29
  • ASTM A311
  • ASTM A510
  • SAE J1397
  • SAE J403
  • SAE J412

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