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SAE-AISI 1108 (G11080) Carbon Steel

SAE-AISI 1108 steel is a resulfurized carbon steel formulated for primary forming into wrought products. 1108 is the designation in both the SAE and AISI systems for this material. G11080 is the UNS number.

It can have the highest ductility and the lowest tensile strength among wrought resulfurized carbon steels.

The properties of SAE-AISI 1108 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 1108 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

110 to 140

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

23 to 34 %

Fatigue Strength

170 to 260 MPa 25 to 37 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

45 to 57 %

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

250 to 280 MPa 37 to 41 x 103 psi

Tensile Strength: Ultimate (UTS)

380 to 440 MPa 55 to 64 x 103 psi

Tensile Strength: Yield (Proof)

220 to 360 MPa 31 to 52 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

400 °C 750 °F

Melting Completion (Liquidus)

1460 °C 2670 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

52 W/m-K 30 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

1.8 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.4 kg CO2/kg material

Embodied Energy

18 MJ/kg 7.8 x 103 BTU/lb

Embodied Water

46 L/kg 5.5 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

95 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

130 to 340 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

13 to 16 points

Strength to Weight: Bending

15 to 16 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

12 to 14 points

Alloy Composition

Iron (Fe) 98.9 to 99.24
Manganese (Mn) 0.6 to 0.8
Carbon (C) 0.080 to 0.13
Sulfur (S) 0.080 to 0.13
Phosphorus (P) 0 to 0.040

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

Followup Questions

Similar Alloys

Further Reading

Cold-Formed Steel Structures to the AISI Specification, Gregory J. Hancock et al., 2001

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

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