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R30155 Cobalt vs. SAE-AISI 8645 Steel

Both R30155 cobalt and SAE-AISI 8645 steel are iron alloys. They have a modest 33% 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 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
12 to 23
Fatigue Strength, MPa 310
280 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 570
380 to 400
Tensile Strength: Ultimate (UTS), MPa 850
600 to 670
Tensile Strength: Yield (Proof), MPa 390
390 to 560

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
2.6
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
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 370
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
21 to 24
Strength to Weight: Bending, points 24
20 to 22
Thermal Diffusivity, mm2/s 3.2
10
Thermal Shock Resistance, points 21
18 to 20

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.43 to 0.48
Chromium (Cr), % 20 to 22.5
0.4 to 0.6
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
96.5 to 97.7
Manganese (Mn), % 1.0 to 2.0
0.75 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
0.15 to 0.25
Nickel (Ni), % 19 to 21
0.4 to 0.7
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