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R30155 Cobalt vs. S20431 Stainless Steel

Both R30155 cobalt and S20431 stainless steel are iron alloys. They have 53% 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 R30155 cobalt and the bottom bar is S20431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
210
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
46
Fatigue Strength, MPa 310
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
76
Shear Strength, MPa 570
500
Tensile Strength: Ultimate (UTS), MPa 850
710
Tensile Strength: Yield (Proof), MPa 390
350

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 570
410
Maximum Temperature: Mechanical, °C 1100
890
Melting Completion (Liquidus), °C 1470
1400
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 14
17

Otherwise Unclassified Properties

Base Metal Price, % relative 80
12
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 9.7
2.5
Embodied Energy, MJ/kg 150
36
Embodied Water, L/kg 300
140

Common Calculations

PREN (Pitting Resistance) 37
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
270
Resilience: Unit (Modulus of Resilience), kJ/m3 370
310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
25
Strength to Weight: Bending, points 24
23
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 21
15

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.12
Chromium (Cr), % 20 to 22.5
17 to 18
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
1.5 to 3.5
Iron (Fe), % 24.3 to 36.2
66.1 to 74.4
Manganese (Mn), % 1.0 to 2.0
5.0 to 7.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
2.0 to 4.0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0.1 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0