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R30075 Cobalt vs. EN 1.4903 Stainless Steel

R30075 cobalt belongs to the cobalt alloys classification, while EN 1.4903 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is EN 1.4903 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
190
Elongation at Break, % 12
20 to 21
Fatigue Strength, MPa 250 to 840
320 to 330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 82 to 98
75
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
670 to 680
Tensile Strength: Yield (Proof), MPa 480 to 840
500

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
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 2.1
4.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.6
Embodied Energy, MJ/kg 110
36
Embodied Water, L/kg 530
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
120 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
650
Stiffness to Weight: Axial, points 14 to 17
14
Stiffness to Weight: Bending, points 24 to 25
25
Strength to Weight: Axial, points 26 to 42
24
Strength to Weight: Bending, points 22 to 31
22
Thermal Diffusivity, mm2/s 3.5
7.0
Thermal Shock Resistance, points 21 to 29
23

Alloy Composition

Aluminum (Al), % 0 to 0.1
0 to 0.040
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.080 to 0.12
Chromium (Cr), % 27 to 30
8.0 to 9.5
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 0.75
87.1 to 90.5
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.85 to 1.1
Nickel (Ni), % 0 to 0.5
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0 to 0.25
0.030 to 0.070
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.015
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0
Vanadium (V), % 0
0.18 to 0.25