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SAE-AISI 1144 (G11440) Carbon Steel

SAE-AISI 1144 steel is a resulfurized carbon steel formulated for primary forming into wrought products. 1144 is the designation in both the SAE and AISI systems for this material. G11440 is the UNS number.

The properties of SAE-AISI 1144 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare SAE-AISI 1144 steel to: wrought resulfurized carbon steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

220 to 230

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

11 to 17 %

Fatigue Strength

280 to 430 MPa 41 to 63 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

34 to 40 %

Shear Modulus

72 GPa 10 x 106 psi

Shear Strength

460 to 510 MPa 67 to 73 x 103 psi

Tensile Strength: Ultimate (UTS)

750 to 840 MPa 110 to 120 x 103 psi

Tensile Strength: Yield (Proof)

420 to 690 MPa 61 to 100 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

400 °C 750 °F

Melting Completion (Liquidus)

1450 °C 2650 °F

Melting Onset (Solidus)

1410 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

51 W/m-K 30 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

1.9 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.4 kg CO2/kg material

Embodied Energy

19 MJ/kg 8.0 x 103 BTU/lb

Embodied Water

47 L/kg 5.7 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

91 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

480 to 1290 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

27 to 30 points

Strength to Weight: Bending

23 to 25 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

22 to 24 points

Alloy Composition

Iron (Fe) 97.5 to 98
Manganese (Mn) 1.4 to 1.7
Carbon (C) 0.4 to 0.48
Sulfur (S) 0.24 to 0.33
Phosphorus (P) 0 to 0.040

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A29: Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for

Microstructure of Steels and Cast Irons, Madeleine Durand-Charre, 2004

Carbon Steel Handbook, D. Gandy, 2007

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015