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AWS E308Mo vs. S82121 Stainless Steel

Both AWS E308Mo and S82121 stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is AWS E308Mo and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 40
28
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 620
730

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1400
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 19
14
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 3.8
2.8
Embodied Energy, MJ/kg 53
40
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 28
28
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
26
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 4.2
4.0
Thermal Shock Resistance, points 16
20

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.035
Chromium (Cr), % 18 to 21
21 to 23
Copper (Cu), % 0 to 0.75
0.2 to 1.2
Iron (Fe), % 59.6 to 70.5
66.7 to 75.4
Manganese (Mn), % 0.5 to 2.5
1.0 to 2.5
Molybdenum (Mo), % 2.0 to 3.0
0.3 to 1.3
Nickel (Ni), % 9.0 to 12
2.0 to 4.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.010