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AWS ER70S-A1 vs. SAE-AISI 4340M Steel

Both AWS ER70S-A1 and SAE-AISI 4340M steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is AWS ER70S-A1 and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22
6.0
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 590
2340
Tensile Strength: Yield (Proof), MPa 450
1240

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 50
38
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.5
3.9
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.9
Embodied Energy, MJ/kg 20
26
Embodied Water, L/kg 48
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
120
Resilience: Unit (Modulus of Resilience), kJ/m3 540
4120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 21
84
Strength to Weight: Bending, points 20
51
Thermal Diffusivity, mm2/s 14
10
Thermal Shock Resistance, points 17
70

Alloy Composition

Carbon (C), % 0 to 0.12
0.38 to 0.43
Chromium (Cr), % 0
0.7 to 1.0
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 96.1 to 99.3
93.3 to 94.8
Manganese (Mn), % 0 to 1.3
0.65 to 0.9
Molybdenum (Mo), % 0.4 to 0.65
0.35 to 0.45
Nickel (Ni), % 0 to 0.2
1.7 to 2.0
Phosphorus (P), % 0 to 0.025
0 to 0.012
Silicon (Si), % 0.3 to 0.7
1.5 to 1.8
Sulfur (S), % 0 to 0.025
0 to 0.012
Vanadium (V), % 0
0.050 to 0.1
Residuals, % 0 to 0.5
0