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EN 1.8881 Steel vs. R30155 Cobalt

Both EN 1.8881 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 1.8881 steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 16
34
Fatigue Strength, MPa 460
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
81
Shear Strength, MPa 510
570
Tensile Strength: Ultimate (UTS), MPa 830
850
Tensile Strength: Yield (Proof), MPa 710
390

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Maximum Temperature: Mechanical, °C 420
1100
Melting Completion (Liquidus), °C 1460
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
12
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 3.7
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.9
9.7
Embodied Energy, MJ/kg 26
150
Embodied Water, L/kg 54
300

Common Calculations

PREN (Pitting Resistance) 2.0
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
230
Resilience: Unit (Modulus of Resilience), kJ/m3 1320
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 29
28
Strength to Weight: Bending, points 25
24
Thermal Diffusivity, mm2/s 11
3.2
Thermal Shock Resistance, points 24
21

Alloy Composition

Boron (B), % 0 to 0.0050
0
Carbon (C), % 0 to 0.2
0.080 to 0.16
Chromium (Cr), % 0 to 1.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 91.9 to 100
24.3 to 36.2
Manganese (Mn), % 0 to 1.7
1.0 to 2.0
Molybdenum (Mo), % 0 to 0.7
2.5 to 3.5
Nickel (Ni), % 0 to 2.5
19 to 21
Niobium (Nb), % 0 to 0.060
0.75 to 1.3
Nitrogen (N), % 0 to 0.015
0 to 0.2
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 0.8
0 to 1.0
Sulfur (S), % 0 to 0.0080
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Titanium (Ti), % 0 to 0.050
0
Tungsten (W), % 0
2.0 to 3.0
Vanadium (V), % 0 to 0.12
0
Zirconium (Zr), % 0 to 0.15
0