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R30008 Cobalt vs. EN 1.4418 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while EN 1.4418 stainless steel belongs to the iron alloys. They have a modest 37% 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 1.4418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 1.1 to 73
16 to 20
Fatigue Strength, MPa 320 to 530
350 to 480
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
860 to 1000
Tensile Strength: Yield (Proof), MPa 500 to 1080
540 to 790

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1330
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
10

Otherwise Unclassified Properties

Base Metal Price, % relative 95
13
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.8
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 400
130

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
730 to 1590
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 31 to 56
31 to 36
Strength to Weight: Bending, points 25 to 37
26 to 28
Thermal Shock Resistance, points 25 to 44
31 to 36

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.060
Chromium (Cr), % 18.5 to 21.5
15 to 17
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
73.2 to 80.2
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 6.5 to 7.5
0.8 to 1.5
Nickel (Ni), % 15 to 18
4.0 to 6.0
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0 to 0.7
Sulfur (S), % 0 to 0.015
0 to 0.015

Comparable Variants