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R30003 Cobalt vs. EN 1.4945 Stainless Steel

R30003 cobalt belongs to the cobalt alloys classification, while EN 1.4945 stainless steel belongs to the iron alloys. They have 48% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30003 cobalt and the bottom bar is EN 1.4945 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 10 to 73
19 to 34
Fatigue Strength, MPa 320 to 560
230 to 350
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
640 to 740
Tensile Strength: Yield (Proof), MPa 510 to 1090
290 to 550

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Melting Completion (Liquidus), °C 1400
1490
Melting Onset (Solidus), °C 1440
1440
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 95
30
Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.0
5.0
Embodied Energy, MJ/kg 110
73
Embodied Water, L/kg 400
150

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
210 to 760
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 32 to 57
22 to 25
Strength to Weight: Bending, points 26 to 38
20 to 22
Thermal Diffusivity, mm2/s 3.3
3.7
Thermal Shock Resistance, points 26 to 45
14 to 16

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.040 to 0.1
Chromium (Cr), % 19 to 21
15.5 to 17.5
Cobalt (Co), % 39 to 41
0
Iron (Fe), % 10 to 20.5
57.9 to 65.7
Manganese (Mn), % 1.5 to 2.5
0 to 1.5
Molybdenum (Mo), % 6.0 to 8.0
0
Nickel (Ni), % 14 to 16
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Nitrogen (N), % 0
0.060 to 0.14
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 1.2
0.3 to 0.6
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 0
2.5 to 3.5