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SAE-AISI 8740 Steel vs. AWS E209

Both SAE-AISI 8740 steel and AWS E209 are iron alloys. They have 60% of their average alloy composition in common. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is AWS E209.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 23
17
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
79
Tensile Strength: Ultimate (UTS), MPa 580 to 670
770

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1460
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
21
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.5
4.4
Embodied Energy, MJ/kg 20
63
Embodied Water, L/kg 50
180

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 20 to 24
28
Strength to Weight: Bending, points 20 to 22
24
Thermal Shock Resistance, points 17 to 20
19

Alloy Composition

Carbon (C), % 0.38 to 0.43
0 to 0.060
Chromium (Cr), % 0.4 to 0.6
20.5 to 24
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 96.5 to 97.7
51.5 to 64.3
Manganese (Mn), % 0.75 to 1.0
4.0 to 7.0
Molybdenum (Mo), % 0.2 to 0.3
1.5 to 3.0
Nickel (Ni), % 0.4 to 0.7
9.5 to 12
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3