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ASTM F15 Fe-Ni-Co vs. S82121 Stainless Steel

Both ASTM F15 Fe-Ni-Co and S82121 stainless steel are iron alloys. They have 57% of their average alloy composition in common. There are 23 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 ASTM F15 Fe-Ni-Co and the bottom bar is S82121 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.3
0.27
Shear Modulus, GPa 73
78
Tensile Strength: Ultimate (UTS), MPa 520 to 880
730

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Melting Completion (Liquidus), °C 1410
1430
Melting Onset (Solidus), °C 1450
1380
Specific Heat Capacity, J/kg-K 460
480
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 6.0
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.7
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 4.0
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 49
14
Density, g/cm3 8.3
7.7
Embodied Carbon, kg CO2/kg material 5.2
2.8
Embodied Energy, MJ/kg 71
40
Embodied Water, L/kg 190
150

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 17 to 29
26
Strength to Weight: Bending, points 17 to 24
23
Thermal Diffusivity, mm2/s 4.5
4.0
Thermal Shock Resistance, points 32 to 55
20

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Carbon (C), % 0 to 0.040
0 to 0.035
Chromium (Cr), % 0 to 0.2
21 to 23
Cobalt (Co), % 16 to 18
0
Copper (Cu), % 0 to 0.2
0.2 to 1.2
Iron (Fe), % 50.3 to 56
66.7 to 75.4
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
1.0 to 2.5
Molybdenum (Mo), % 0 to 0.2
0.3 to 1.3
Nickel (Ni), % 28 to 30
2.0 to 4.0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0 to 0.1
0
Zirconium (Zr), % 0 to 0.1
0