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R30012 Cobalt vs. EN 1.4405 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while EN 1.4405 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 R30012 cobalt and the bottom bar is EN 1.4405 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
17
Fatigue Strength, MPa 320
370
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 830
860
Tensile Strength: Yield (Proof), MPa 650
610

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1280
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
2.8
Embodied Energy, MJ/kg 120
39
Embodied Water, L/kg 480
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
130
Resilience: Unit (Modulus of Resilience), kJ/m3 960
950
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
31
Strength to Weight: Bending, points 22
26
Thermal Diffusivity, mm2/s 3.8
4.6
Thermal Shock Resistance, points 23
29

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.060
Chromium (Cr), % 27 to 32
15 to 17
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
73.6 to 80.3
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
0.7 to 1.5
Nickel (Ni), % 0 to 3.0
4.0 to 6.0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 2.0
0 to 0.8
Sulfur (S), % 0
0 to 0.025
Tungsten (W), % 7.5 to 9.5
0