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EN 1.8550 Steel vs. R30155 Cobalt

Both EN 1.8550 steel and R30155 cobalt 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 EN 1.8550 steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 300
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 11
34
Fatigue Strength, MPa 470
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
81
Shear Strength, MPa 600
570
Tensile Strength: Ultimate (UTS), MPa 1000
850
Tensile Strength: Yield (Proof), MPa 760
390

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 440
1100
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 40
12
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 3.4
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.7
9.7
Embodied Energy, MJ/kg 23
150
Embodied Water, L/kg 67
300

Common Calculations

PREN (Pitting Resistance) 2.3
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
230
Resilience: Unit (Modulus of Resilience), kJ/m3 1550
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 36
28
Strength to Weight: Bending, points 29
24
Thermal Diffusivity, mm2/s 11
3.2
Thermal Shock Resistance, points 29
21

Alloy Composition

Aluminum (Al), % 0.8 to 1.2
0
Carbon (C), % 0.3 to 0.37
0.080 to 0.16
Chromium (Cr), % 1.5 to 1.8
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 94.4 to 96.3
24.3 to 36.2
Manganese (Mn), % 0.4 to 0.7
1.0 to 2.0
Molybdenum (Mo), % 0.15 to 0.25
2.5 to 3.5
Nickel (Ni), % 0.85 to 1.2
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0