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R31538 Cobalt vs. S15500 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while S15500 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is S15500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
6.8 to 16
Fatigue Strength, MPa 310 to 480
350 to 650
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 22
17 to 40
Rockwell C Hardness 25 to 35
27 to 46
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
890 to 1490
Tensile Strength: Yield (Proof), MPa 580 to 930
590 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1290
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.7
Embodied Energy, MJ/kg 110
39
Embodied Water, L/kg 530
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
890 to 4460
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
32 to 53
Strength to Weight: Bending, points 27 to 32
26 to 37
Thermal Diffusivity, mm2/s 3.5
4.6
Thermal Shock Resistance, points 25 to 33
30 to 50

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.070
Chromium (Cr), % 26 to 30
14 to 15.5
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
2.5 to 4.5
Iron (Fe), % 0 to 0.75
71.9 to 79.9
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
3.5 to 5.5
Niobium (Nb), % 0
0.15 to 0.45
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030