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AWS E308Mo vs. SAE-AISI 4340M Steel

Both AWS E308Mo and SAE-AISI 4340M steel are iron alloys. They have 69% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is AWS E308Mo and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 40
6.0
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
72
Tensile Strength: Ultimate (UTS), MPa 620
2340

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
38
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 19
3.9
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.8
1.9
Embodied Energy, MJ/kg 53
26
Embodied Water, L/kg 160
55

Common Calculations

PREN (Pitting Resistance) 28
2.2
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
84
Strength to Weight: Bending, points 20
51
Thermal Diffusivity, mm2/s 4.2
10
Thermal Shock Resistance, points 16
70

Alloy Composition

Carbon (C), % 0 to 0.080
0.38 to 0.43
Chromium (Cr), % 18 to 21
0.7 to 1.0
Copper (Cu), % 0 to 0.75
0
Iron (Fe), % 59.6 to 70.5
93.3 to 94.8
Manganese (Mn), % 0.5 to 2.5
0.65 to 0.9
Molybdenum (Mo), % 2.0 to 3.0
0.35 to 0.45
Nickel (Ni), % 9.0 to 12
1.7 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.012
Silicon (Si), % 0 to 1.0
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1