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R30155 Cobalt vs. S15500 Stainless Steel

Both R30155 cobalt and S15500 stainless steel are iron alloys. They have 51% of their average alloy composition in common. There are 32 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 S15500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
290 to 430
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
6.8 to 16
Fatigue Strength, MPa 310
350 to 650
Poisson's Ratio 0.29
0.28
Reduction in Area, % 34
17 to 40
Shear Modulus, GPa 81
75
Shear Strength, MPa 570
540 to 870
Tensile Strength: Ultimate (UTS), MPa 850
890 to 1490
Tensile Strength: Yield (Proof), MPa 390
590 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Maximum Temperature: Corrosion, °C 570
440
Maximum Temperature: Mechanical, °C 1100
820
Melting Completion (Liquidus), °C 1470
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 12
17
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 80
13
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
2.7
Embodied Energy, MJ/kg 150
39
Embodied Water, L/kg 300
130

Common Calculations

PREN (Pitting Resistance) 37
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 370
890 to 4460
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
32 to 53
Strength to Weight: Bending, points 24
26 to 37
Thermal Diffusivity, mm2/s 3.2
4.6
Thermal Shock Resistance, points 21
30 to 50

Alloy Composition

Carbon (C), % 0.080 to 0.16
0 to 0.070
Chromium (Cr), % 20 to 22.5
14 to 15.5
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
2.5 to 4.5
Iron (Fe), % 24.3 to 36.2
71.9 to 79.9
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
3.5 to 5.5
Niobium (Nb), % 0.75 to 1.3
0.15 to 0.45
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0