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ASTM A369 Grade FP91 vs. R30021 Cobalt

ASTM A369 grade FP91 belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP91 and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 19
9.0
Fatigue Strength, MPa 320
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 670
700
Tensile Strength: Yield (Proof), MPa 460
500

Thermal Properties

Latent Heat of Fusion, J/g 270
330
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1420
1190
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.6
8.0
Embodied Energy, MJ/kg 37
110
Embodied Water, L/kg 88
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
57
Resilience: Unit (Modulus of Resilience), kJ/m3 560
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24
23
Strength to Weight: Bending, points 22
21
Thermal Diffusivity, mm2/s 6.9
3.8
Thermal Shock Resistance, points 18
21

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0.2 to 0.35
Chromium (Cr), % 8.0 to 9.5
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 87.3 to 90.3
0 to 3.0
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.85 to 1.1
4.5 to 6.0
Nickel (Ni), % 0 to 0.4
2.0 to 3.0
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0.2 to 0.5
0 to 1.5
Sulfur (S), % 0 to 0.025
0
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0