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SAE-AISI 4340M Steel vs. AWS E385

Both SAE-AISI 4340M steel and AWS E385 are iron alloys. They have 50% 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 SAE-AISI 4340M steel and the bottom bar is AWS E385.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 6.0
34
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
79
Tensile Strength: Ultimate (UTS), MPa 2340
580

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1390
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 38
14
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
31
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.9
5.8
Embodied Energy, MJ/kg 26
79
Embodied Water, L/kg 55
200

Common Calculations

PREN (Pitting Resistance) 2.2
36
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 84
20
Strength to Weight: Bending, points 51
19
Thermal Diffusivity, mm2/s 10
3.6
Thermal Shock Resistance, points 70
15

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.030
Chromium (Cr), % 0.7 to 1.0
19.5 to 21.5
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 93.3 to 94.8
41.8 to 50.1
Manganese (Mn), % 0.65 to 0.9
1.0 to 2.5
Molybdenum (Mo), % 0.35 to 0.45
4.2 to 5.2
Nickel (Ni), % 1.7 to 2.0
24 to 26
Phosphorus (P), % 0 to 0.012
0 to 0.030
Silicon (Si), % 1.5 to 1.8
0 to 0.9
Sulfur (S), % 0 to 0.012
0 to 0.020
Vanadium (V), % 0.050 to 0.1
0