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S21800 Stainless Steel vs. R30003 Cobalt

S21800 stainless steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have 43% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 40
10 to 73
Fatigue Strength, MPa 330
320 to 560
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
83
Tensile Strength: Ultimate (UTS), MPa 740
970 to 1720
Tensile Strength: Yield (Proof), MPa 390
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 340
310
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1310
1440
Specific Heat Capacity, J/kg-K 500
450
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
95
Density, g/cm3 7.5
8.4
Embodied Carbon, kg CO2/kg material 3.1
8.0
Embodied Energy, MJ/kg 45
110
Embodied Water, L/kg 150
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 390
600 to 2790
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
32 to 57
Strength to Weight: Bending, points 24
26 to 38
Thermal Shock Resistance, points 17
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 0 to 0.1
0 to 0.15
Chromium (Cr), % 16 to 18
19 to 21
Cobalt (Co), % 0
39 to 41
Iron (Fe), % 59.1 to 65.4
10 to 20.5
Manganese (Mn), % 7.0 to 9.0
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 8.0 to 9.0
14 to 16
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.015
Silicon (Si), % 3.5 to 4.5
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015