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R30155 Cobalt vs. SAE-AISI 94B17 Steel

Both R30155 cobalt and SAE-AISI 94B17 steel are iron alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 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 R30155 cobalt and the bottom bar is SAE-AISI 94B17 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
130
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
25
Fatigue Strength, MPa 310
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 570
280
Tensile Strength: Ultimate (UTS), MPa 850
440
Tensile Strength: Yield (Proof), MPa 390
270

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
410
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
39
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
2.4
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 300
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
96
Resilience: Unit (Modulus of Resilience), kJ/m3 370
200
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
16
Strength to Weight: Bending, points 24
16
Thermal Diffusivity, mm2/s 3.2
10
Thermal Shock Resistance, points 21
13

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.080 to 0.16
0.15 to 0.2
Chromium (Cr), % 20 to 22.5
0.3 to 0.5
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
97.1 to 98.3
Manganese (Mn), % 1.0 to 2.0
0.75 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
0.080 to 0.15
Nickel (Ni), % 19 to 21
0.3 to 0.6
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0