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S31730 Stainless Steel vs. R30816 Cobalt

S31730 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have 41% of their average alloy composition in common. There are 24 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 S31730 stainless steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 40
23
Fatigue Strength, MPa 170
250
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 540
1020
Tensile Strength: Yield (Proof), MPa 200
460

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Melting Completion (Liquidus), °C 1430
1540
Melting Onset (Solidus), °C 1390
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Density, g/cm3 8.0
9.1
Embodied Carbon, kg CO2/kg material 4.6
20
Embodied Energy, MJ/kg 63
320
Embodied Water, L/kg 180
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
190
Resilience: Unit (Modulus of Resilience), kJ/m3 99
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 19
31
Strength to Weight: Bending, points 18
25
Thermal Shock Resistance, points 12
28

Alloy Composition

Carbon (C), % 0 to 0.030
0.32 to 0.42
Chromium (Cr), % 17 to 19
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 52.4 to 61
0 to 5.0
Manganese (Mn), % 0 to 2.0
1.0 to 2.0
Molybdenum (Mo), % 3.0 to 4.0
3.5 to 4.5
Nickel (Ni), % 15 to 16.5
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0 to 0.045
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 0.010
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5