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R30155 Cobalt vs. EN 1.8519 Steel

Both R30155 cobalt and EN 1.8519 steel are iron alloys. They have a modest 34% 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 (5, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is EN 1.8519 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
360
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
10
Fatigue Strength, MPa 310
630
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 570
710
Tensile Strength: Ultimate (UTS), MPa 850
1200
Tensile Strength: Yield (Proof), MPa 390
1030

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
450
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
40
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 80
3.1
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
1.9
Embodied Energy, MJ/kg 150
26
Embodied Water, L/kg 300
58

Common Calculations

PREN (Pitting Resistance) 37
3.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
120
Resilience: Unit (Modulus of Resilience), kJ/m3 370
2790
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
43
Strength to Weight: Bending, points 24
32
Thermal Diffusivity, mm2/s 3.2
11
Thermal Shock Resistance, points 21
35

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.27 to 0.34
Chromium (Cr), % 20 to 22.5
2.3 to 2.7
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
95.7 to 97.1
Manganese (Mn), % 1.0 to 2.0
0.4 to 0.7
Molybdenum (Mo), % 2.5 to 3.5
0.15 to 0.25
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 0.025
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.035
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0
Vanadium (V), % 0
0.1 to 0.2