SAE-AISI 1340 (G13400) Carbon Steel
SAE-AISI 1340 steel is a resulfurized carbon steel formulated for primary forming into wrought products. 1340 is the designation in both the SAE and AISI systems for this material. G13400 is the UNS number.
The properties of SAE-AISI 1340 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 1340 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
160 to 210
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
11 to 23 %
Fatigue Strength
220 to 390 MPa 31 to 56 x 103 psi
Poisson's Ratio
0.29
Shear Modulus
72 GPa 11 x 106 psi
Shear Strength
340 to 440 MPa 50 to 63 x 103 psi
Tensile Strength: Ultimate (UTS)
540 to 730 MPa 79 to 110 x 103 psi
Tensile Strength: Yield (Proof)
300 to 620 MPa 44 to 90 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
12 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.3 % 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 8.2 x 103 BTU/lb
Embodied Water
48 L/kg 5.7 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
78 to 110 MJ/m3
Resilience: Unit (Modulus of Resilience)
240 to 1040 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
19 to 26 points
Strength to Weight: Bending
19 to 23 points
Thermal Diffusivity
14 mm2/s
Thermal Shock Resistance
17 to 23 points
Alloy Composition
| Fe | 97.2 to 97.9 | |
| Mn | 1.6 to 1.9 | |
| C | 0.38 to 0.43 | |
| Si | 0.15 to 0.35 | |
| S | 0 to 0.040 | |
| P | 0 to 0.035 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM A752: Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel
ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades
Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993
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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015