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S31730 Stainless Steel vs. G-CoCr28 Cobalt

S31730 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 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 S31730 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 40
6.7
Fatigue Strength, MPa 170
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 540
560
Tensile Strength: Yield (Proof), MPa 200
260

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Maximum Temperature: Mechanical, °C 990
1200
Melting Completion (Liquidus), °C 1430
1330
Melting Onset (Solidus), °C 1390
1270
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 24
100
Density, g/cm3 8.0
8.1
Embodied Carbon, kg CO2/kg material 4.6
6.2
Embodied Energy, MJ/kg 63
84
Embodied Water, L/kg 180
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
31
Resilience: Unit (Modulus of Resilience), kJ/m3 99
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
19
Strength to Weight: Bending, points 18
19
Thermal Shock Resistance, points 12
14

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.25
Chromium (Cr), % 17 to 19
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 52.4 to 61
9.7 to 24.5
Manganese (Mn), % 0 to 2.0
0 to 1.5
Molybdenum (Mo), % 3.0 to 4.0
0 to 0.5
Nickel (Ni), % 15 to 16.5
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.045
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0 to 0.010
0 to 0.030