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S45000 Stainless Steel vs. R30816 Cobalt

S45000 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is S45000 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280 to 410
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 6.8 to 14
23
Fatigue Strength, MPa 330 to 650
250
Poisson's Ratio 0.28
0.3
Reduction in Area, % 22 to 50
22
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 980 to 1410
1020
Tensile Strength: Yield (Proof), MPa 580 to 1310
460

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1440
1540
Melting Onset (Solidus), °C 1390
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 17
13
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 2.8
20
Embodied Energy, MJ/kg 39
320
Embodied Water, L/kg 130
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 94 to 160
190
Resilience: Unit (Modulus of Resilience), kJ/m3 850 to 4400
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 35 to 50
31
Strength to Weight: Bending, points 28 to 36
25
Thermal Diffusivity, mm2/s 4.5
3.3
Thermal Shock Resistance, points 33 to 47
28

Alloy Composition

Carbon (C), % 0 to 0.050
0.32 to 0.42
Chromium (Cr), % 14 to 16
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 1.3 to 1.8
0
Iron (Fe), % 72.1 to 79.3
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0.5 to 1.0
3.5 to 4.5
Nickel (Ni), % 5.0 to 7.0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
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
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5