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S82012 Stainless Steel vs. R30155 Cobalt

Both S82012 stainless steel and R30155 cobalt are iron alloys. They have 54% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is S82012 stainless steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 40
34
Fatigue Strength, MPa 480
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
81
Shear Strength, MPa 550
570
Tensile Strength: Ultimate (UTS), MPa 800
850
Tensile Strength: Yield (Proof), MPa 560
390

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 420
570
Maximum Temperature: Mechanical, °C 950
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 11
80
Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.4
9.7
Embodied Energy, MJ/kg 35
150
Embodied Water, L/kg 140
300

Common Calculations

PREN (Pitting Resistance) 24
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 290
230
Resilience: Unit (Modulus of Resilience), kJ/m3 790
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 29
28
Strength to Weight: Bending, points 25
24
Thermal Diffusivity, mm2/s 3.9
3.2
Thermal Shock Resistance, points 23
21

Alloy Composition

Carbon (C), % 0 to 0.050
0.080 to 0.16
Chromium (Cr), % 19 to 20.5
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 71.3 to 77.9
24.3 to 36.2
Manganese (Mn), % 2.0 to 4.0
1.0 to 2.0
Molybdenum (Mo), % 0.1 to 0.6
2.5 to 3.5
Nickel (Ni), % 0.8 to 1.5
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0.16 to 0.26
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.8
0 to 1.0
Sulfur (S), % 0 to 0.0050
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0