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R30155 Cobalt vs. SAE-AISI 1547 Steel

Both R30155 cobalt and SAE-AISI 1547 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 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is SAE-AISI 1547 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
200 to 220
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
11 to 17
Fatigue Strength, MPa 310
270 to 430
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34
32 to 40
Shear Modulus, GPa 81
73
Shear Strength, MPa 570
440 to 480
Tensile Strength: Ultimate (UTS), MPa 850
740 to 800
Tensile Strength: Yield (Proof), MPa 390
400 to 690

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
400
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
51
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Base Metal Price, % relative 80
1.9
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
1.4
Embodied Energy, MJ/kg 150
19
Embodied Water, L/kg 300
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
80 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 370
430 to 1280
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
26 to 28
Strength to Weight: Bending, points 24
23 to 24
Thermal Diffusivity, mm2/s 3.2
14
Thermal Shock Resistance, points 21
23 to 25

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.43 to 0.51
Chromium (Cr), % 20 to 22.5
0
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
97.8 to 98.2
Manganese (Mn), % 1.0 to 2.0
1.4 to 1.7
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0 to 0.050
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0