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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

Iron (Fe) 97.2 to 97.9
Manganese (Mn) 1.6 to 1.9
Carbon (C) 0.38 to 0.43
Silicon (Si) 0.15 to 0.35
Sulfur (S) 0 to 0.040
Phosphorus (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