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S82121 Stainless Steel vs. R30155 Cobalt

Both S82121 stainless steel and R30155 cobalt are iron alloys. They have 57% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S82121 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
220
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 28
34
Fatigue Strength, MPa 370
310
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 78
81
Shear Strength, MPa 470
570
Tensile Strength: Ultimate (UTS), MPa 730
850
Tensile Strength: Yield (Proof), MPa 510
390

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 430
570
Maximum Temperature: Mechanical, °C 1020
1100
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Base Metal Price, % relative 14
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.8
9.7
Embodied Energy, MJ/kg 40
150
Embodied Water, L/kg 150
300

Common Calculations

PREN (Pitting Resistance) 28
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
230
Resilience: Unit (Modulus of Resilience), kJ/m3 660
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 26
28
Strength to Weight: Bending, points 23
24
Thermal Diffusivity, mm2/s 4.0
3.2
Thermal Shock Resistance, points 20
21

Alloy Composition

Carbon (C), % 0 to 0.035
0.080 to 0.16
Chromium (Cr), % 21 to 23
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0.2 to 1.2
0
Iron (Fe), % 66.7 to 75.4
24.3 to 36.2
Manganese (Mn), % 1.0 to 2.5
1.0 to 2.0
Molybdenum (Mo), % 0.3 to 1.3
2.5 to 3.5
Nickel (Ni), % 2.0 to 4.0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0.15 to 0.25
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0