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R30155 Cobalt vs. EN 1.5521 Steel

Both R30155 cobalt and EN 1.5521 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 EN 1.5521 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
130 to 180
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
11 to 21
Fatigue Strength, MPa 310
210 to 310
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34
59 to 72
Shear Modulus, GPa 81
73
Shear Strength, MPa 570
310 to 360
Tensile Strength: Ultimate (UTS), MPa 850
430 to 1390
Tensile Strength: Yield (Proof), MPa 390
300 to 490

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
13

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
44 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 370
250 to 630
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
15 to 49
Strength to Weight: Bending, points 24
16 to 35
Thermal Diffusivity, mm2/s 3.2
14
Thermal Shock Resistance, points 21
13 to 41

Alloy Composition

Boron (B), % 0
0.00080 to 0.0050
Carbon (C), % 0.080 to 0.16
0.16 to 0.2
Chromium (Cr), % 20 to 22.5
0
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 24.3 to 36.2
98 to 98.9
Manganese (Mn), % 1.0 to 2.0
0.9 to 1.2
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 0.025
Silicon (Si), % 0 to 1.0
0 to 0.3
Sulfur (S), % 0 to 0.030
0 to 0.025
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0