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S15500 Stainless Steel vs. R30021 Cobalt

S15500 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S15500 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 6.8 to 16
9.0
Fatigue Strength, MPa 350 to 650
250
Poisson's Ratio 0.28
0.29
Rockwell C Hardness 27 to 46
32
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 890 to 1490
700
Tensile Strength: Yield (Proof), MPa 590 to 1310
500

Thermal Properties

Latent Heat of Fusion, J/g 280
330
Melting Completion (Liquidus), °C 1430
1350
Melting Onset (Solidus), °C 1380
1190
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.7
8.0
Embodied Energy, MJ/kg 39
110
Embodied Water, L/kg 130
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
57
Resilience: Unit (Modulus of Resilience), kJ/m3 890 to 4460
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 53
23
Strength to Weight: Bending, points 26 to 37
21
Thermal Diffusivity, mm2/s 4.6
3.8
Thermal Shock Resistance, points 30 to 50
21

Alloy Composition

Carbon (C), % 0 to 0.070
0.2 to 0.35
Chromium (Cr), % 14 to 15.5
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 2.5 to 4.5
0
Iron (Fe), % 71.9 to 79.9
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 3.5 to 5.5
2.0 to 3.0
Niobium (Nb), % 0.15 to 0.45
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.030
0