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R30008 Cobalt vs. EN 1.4021 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while EN 1.4021 stainless steel belongs to the iron alloys. They have a modest 28% 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 (9, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is EN 1.4021 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 1.1 to 73
11 to 17
Fatigue Strength, MPa 320 to 530
240 to 380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
76
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
630 to 880
Tensile Strength: Yield (Proof), MPa 500 to 1080
390 to 670

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1330
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 95
7.0
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
1.9
Embodied Energy, MJ/kg 110
27
Embodied Water, L/kg 400
100

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
400 to 1160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 31 to 56
23 to 31
Strength to Weight: Bending, points 25 to 37
21 to 26
Thermal Shock Resistance, points 25 to 44
22 to 31

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0.16 to 0.25
Chromium (Cr), % 18.5 to 21.5
12 to 14
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
83.2 to 87.8
Manganese (Mn), % 1.0 to 2.0
0 to 1.5
Molybdenum (Mo), % 6.5 to 7.5
0
Nickel (Ni), % 15 to 18
0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015

Comparable Variants