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R30155 Cobalt vs. S30441 Stainless Steel

Both R30155 cobalt and S30441 stainless steel are iron alloys. They have 60% 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 S30441 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
170
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
45
Fatigue Strength, MPa 310
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
76
Shear Strength, MPa 570
400
Tensile Strength: Ultimate (UTS), MPa 850
580
Tensile Strength: Yield (Proof), MPa 390
230

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Maximum Temperature: Corrosion, °C 570
460
Maximum Temperature: Mechanical, °C 1100
940
Melting Completion (Liquidus), °C 1470
1420
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 80
18
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
3.4
Embodied Energy, MJ/kg 150
50
Embodied Water, L/kg 300
150

Common Calculations

PREN (Pitting Resistance) 37
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
210
Resilience: Unit (Modulus of Resilience), kJ/m3 370
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
21
Strength to Weight: Bending, points 24
20
Thermal Diffusivity, mm2/s 3.2
4.0
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.080
Chromium (Cr), % 20 to 22.5
17.5 to 19.5
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 24.3 to 36.2
62 to 71.7
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
8.0 to 10.5
Niobium (Nb), % 0.75 to 1.3
0.1 to 0.5
Nitrogen (N), % 0 to 0.2
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
1.0 to 2.0
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
0.2 to 0.8