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R30155 Cobalt vs. S41425 Stainless Steel

Both R30155 cobalt and S41425 stainless steel are iron alloys. They have 52% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is S41425 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
280
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
17
Fatigue Strength, MPa 310
450
Poisson's Ratio 0.29
0.28
Reduction in Area, % 34
51
Shear Modulus, GPa 81
77
Shear Strength, MPa 570
570
Tensile Strength: Ultimate (UTS), MPa 850
920
Tensile Strength: Yield (Proof), MPa 390
750

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 570
390
Maximum Temperature: Mechanical, °C 1100
810
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
16
Thermal Expansion, µm/m-K 14
10

Otherwise Unclassified Properties

Base Metal Price, % relative 80
13
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 9.7
2.9
Embodied Energy, MJ/kg 150
40
Embodied Water, L/kg 300
120

Common Calculations

PREN (Pitting Resistance) 37
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
150
Resilience: Unit (Modulus of Resilience), kJ/m3 370
1420
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
33
Strength to Weight: Bending, points 24
27
Thermal Diffusivity, mm2/s 3.2
4.4
Thermal Shock Resistance, points 21
33

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.050
Chromium (Cr), % 20 to 22.5
12 to 15
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 24.3 to 36.2
74 to 81.9
Manganese (Mn), % 1.0 to 2.0
0.5 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
1.5 to 2.0
Nickel (Ni), % 19 to 21
4.0 to 7.0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0.060 to 0.12
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.0050
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0