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SAE-AISI 1340 Steel vs. ACI-ASTM CG8M Steel

Both SAE-AISI 1340 steel and ACI-ASTM CG8M steel are iron alloys. They have 65% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1340 steel and the bottom bar is ACI-ASTM CG8M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 210
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 23
45
Fatigue Strength, MPa 220 to 390
280
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
79
Tensile Strength: Ultimate (UTS), MPa 540 to 730
550
Tensile Strength: Yield (Proof), MPa 300 to 620
300

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1020
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 51
16
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
20
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.4
4.1
Embodied Energy, MJ/kg 19
56
Embodied Water, L/kg 48
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 110
210
Resilience: Unit (Modulus of Resilience), kJ/m3 240 to 1040
220
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19 to 26
19
Strength to Weight: Bending, points 19 to 23
19
Thermal Diffusivity, mm2/s 14
4.3
Thermal Shock Resistance, points 17 to 23
12

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.080
Chromium (Cr), % 0
18 to 21
Iron (Fe), % 97.2 to 97.9
58.8 to 70
Manganese (Mn), % 1.6 to 1.9
0 to 1.5
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0
9.0 to 13
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.5
Sulfur (S), % 0 to 0.040
0 to 0.040