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ASTM A369 Grade FP91 vs. R30035 Cobalt

ASTM A369 grade FP91 belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP91 and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220 to 230
Elongation at Break, % 19
9.0 to 46
Fatigue Strength, MPa 320
170 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
84 to 89
Tensile Strength: Ultimate (UTS), MPa 670
900 to 1900
Tensile Strength: Yield (Proof), MPa 460
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1320
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 26
11
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 10
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
100
Density, g/cm3 7.8
8.7
Embodied Carbon, kg CO2/kg material 2.6
10
Embodied Energy, MJ/kg 37
140
Embodied Water, L/kg 88
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 560
210 to 5920
Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 24
29 to 61
Strength to Weight: Bending, points 22
24 to 39
Thermal Diffusivity, mm2/s 6.9
3.0
Thermal Shock Resistance, points 18
23 to 46

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Boron (B), % 0
0 to 0.015
Carbon (C), % 0.080 to 0.12
0 to 0.025
Chromium (Cr), % 8.0 to 9.5
19 to 21
Cobalt (Co), % 0
29.1 to 39
Iron (Fe), % 87.3 to 90.3
0 to 1.0
Manganese (Mn), % 0.3 to 0.6
0 to 0.15
Molybdenum (Mo), % 0.85 to 1.1
9.0 to 10.5
Nickel (Ni), % 0 to 0.4
33 to 37
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.025
0 to 0.015
Silicon (Si), % 0.2 to 0.5
0 to 0.15
Sulfur (S), % 0 to 0.025
0 to 0.010
Titanium (Ti), % 0 to 0.010
0 to 1.0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0