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R30008 Cobalt vs. EN 1.4903 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while EN 1.4903 stainless steel belongs to the iron alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30008 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, % 1.1 to 73
20 to 21
Fatigue Strength, MPa 320 to 530
320 to 330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
75
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
670 to 680
Tensile Strength: Yield (Proof), MPa 500 to 1080
500

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 95
7.0
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 400
88

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
650
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 31 to 56
24
Strength to Weight: Bending, points 25 to 37
22
Thermal Shock Resistance, points 25 to 44
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0.080 to 0.12
Chromium (Cr), % 18.5 to 21.5
8.0 to 9.5
Cobalt (Co), % 39 to 42
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 7.6 to 20
87.1 to 90.5
Manganese (Mn), % 1.0 to 2.0
0.3 to 0.6
Molybdenum (Mo), % 6.5 to 7.5
0.85 to 1.1
Nickel (Ni), % 15 to 18
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.015
0 to 0.025
Silicon (Si), % 0 to 1.2
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Vanadium (V), % 0
0.18 to 0.25