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
| Fe | 98.9 to 99.24 | |
| Mn | 0.6 to 0.8 | |
| C | 0.080 to 0.13 | |
| S | 0.080 to 0.13 | |
| 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