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R30021 Cobalt vs. EN 1.4901 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.4901 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.4901 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
19
Fatigue Strength, MPa 250
310
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 700
740
Tensile Strength: Yield (Proof), MPa 500
490

Thermal Properties

Latent Heat of Fusion, J/g 330
260
Melting Completion (Liquidus), °C 1350
1490
Melting Onset (Solidus), °C 1190
1450
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
26
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
8.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
2.8
Embodied Energy, MJ/kg 110
40
Embodied Water, L/kg 520
89

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
120
Resilience: Unit (Modulus of Resilience), kJ/m3 570
620
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
26
Strength to Weight: Bending, points 21
23
Thermal Diffusivity, mm2/s 3.8
6.9
Thermal Shock Resistance, points 21
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.0060
Carbon (C), % 0.2 to 0.35
0.070 to 0.13
Chromium (Cr), % 26 to 29
8.5 to 9.5
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
85.8 to 89.1
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 4.5 to 6.0
0.3 to 0.6
Nickel (Ni), % 2.0 to 3.0
0 to 0.4
Niobium (Nb), % 0
0.040 to 0.090
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.5
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
1.5 to 2.0
Vanadium (V), % 0
0.15 to 0.25
Zirconium (Zr), % 0
0 to 0.010