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R30605 Cobalt vs. EN 1.4903 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while EN 1.4903 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 1.4903 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
20 to 21
Fatigue Strength, MPa 260 to 590
320 to 330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
670 to 680
Tensile Strength: Yield (Proof), MPa 470 to 1600
500

Thermal Properties

Latent Heat of Fusion, J/g 290
270
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 9.6
26
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
4.0

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
2.6
Embodied Energy, MJ/kg 140
36
Embodied Water, L/kg 450
88

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
24
Strength to Weight: Bending, points 25 to 36
22
Thermal Diffusivity, mm2/s 2.5
7.0
Thermal Shock Resistance, points 31 to 52
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Carbon (C), % 0.050 to 0.15
0.080 to 0.12
Chromium (Cr), % 19 to 21
8.0 to 9.5
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 3.0
87.1 to 90.5
Manganese (Mn), % 1.0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 9.0 to 11
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0
0.18 to 0.25