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R30605 Cobalt vs. EN 1.4901 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while EN 1.4901 stainless steel belongs to the iron alloys. There are 25 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 R30605 cobalt and the bottom bar is EN 1.4901 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
19
Fatigue Strength, MPa 260 to 590
310
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
740
Tensile Strength: Yield (Proof), MPa 470 to 1600
490

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Melting Completion (Liquidus), °C 1410
1490
Melting Onset (Solidus), °C 1330
1450
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 9.6
26
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
9.3

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.9
Embodied Carbon, kg CO2/kg material 9.8
2.8
Embodied Energy, MJ/kg 140
40
Embodied Water, L/kg 450
89

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 33 to 55
26
Strength to Weight: Bending, points 25 to 36
23
Thermal Diffusivity, mm2/s 2.5
6.9
Thermal Shock Resistance, points 31 to 52
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Boron (B), % 0
0.0010 to 0.0060
Carbon (C), % 0.050 to 0.15
0.070 to 0.13
Chromium (Cr), % 19 to 21
8.5 to 9.5
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
85.8 to 89.1
Manganese (Mn), % 1.0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.3 to 0.6
Nickel (Ni), % 9.0 to 11
0 to 0.4
Niobium (Nb), % 0
0.040 to 0.090
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 14 to 16
1.5 to 2.0
Vanadium (V), % 0
0.15 to 0.25
Zirconium (Zr), % 0
0 to 0.010