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R30001 Cobalt vs. EN 1.4021 Stainless Steel

R30001 cobalt belongs to the cobalt alloys classification, while EN 1.4021 stainless steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30001 cobalt and the bottom bar is EN 1.4021 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
11 to 17
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 620
630 to 880

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Melting Completion (Liquidus), °C 1530
1440
Melting Onset (Solidus), °C 1260
1400
Specific Heat Capacity, J/kg-K 430
480
Thermal Conductivity, W/m-K 15
30
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.3

Otherwise Unclassified Properties

Density, g/cm3 9.0
7.7
Embodied Carbon, kg CO2/kg material 8.9
1.9
Embodied Energy, MJ/kg 130
27
Embodied Water, L/kg 460
100

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 19
23 to 31
Strength to Weight: Bending, points 18
21 to 26
Thermal Diffusivity, mm2/s 3.7
8.1
Thermal Shock Resistance, points 19
22 to 31

Alloy Composition

Carbon (C), % 2.0 to 3.0
0.16 to 0.25
Chromium (Cr), % 28 to 32
12 to 14
Cobalt (Co), % 43 to 59
0
Iron (Fe), % 0 to 3.0
83.2 to 87.8
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 11 to 13
0