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S21904 Stainless Steel vs. G-CoCr28 Cobalt

S21904 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have 41% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is S21904 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, % 17 to 51
6.7
Fatigue Strength, MPa 380 to 550
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
83
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
560
Tensile Strength: Yield (Proof), MPa 390 to 910
260

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Maximum Temperature: Mechanical, °C 980
1200
Melting Completion (Liquidus), °C 1400
1330
Melting Onset (Solidus), °C 1350
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
8.5
Thermal Expansion, µm/m-K 17
14

Otherwise Unclassified Properties

Base Metal Price, % relative 15
100
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 3.0
6.2
Embodied Energy, MJ/kg 43
84
Embodied Water, L/kg 160
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
31
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 36
19
Strength to Weight: Bending, points 23 to 29
19
Thermal Diffusivity, mm2/s 3.8
2.2
Thermal Shock Resistance, points 15 to 21
14

Alloy Composition

Carbon (C), % 0 to 0.040
0.050 to 0.25
Chromium (Cr), % 19 to 21.5
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 59.5 to 67.4
9.7 to 24.5
Manganese (Mn), % 8.0 to 10
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 5.5 to 7.5
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030