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EN 1.4618 Stainless Steel vs. G-CoCr28 Cobalt

EN 1.4618 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 38% 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 (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.4618 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, % 51
6.7
Fatigue Strength, MPa 240 to 250
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
83
Tensile Strength: Ultimate (UTS), MPa 680 to 700
560
Tensile Strength: Yield (Proof), MPa 250 to 260
260

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Maximum Temperature: Mechanical, °C 900
1200
Melting Completion (Liquidus), °C 1400
1330
Melting Onset (Solidus), °C 1360
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
8.5
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 13
100
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 2.7
6.2
Embodied Energy, MJ/kg 39
84
Embodied Water, L/kg 150
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 270 to 280
31
Resilience: Unit (Modulus of Resilience), kJ/m3 160 to 170
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 24 to 25
19
Strength to Weight: Bending, points 22 to 23
19
Thermal Diffusivity, mm2/s 4.0
2.2
Thermal Shock Resistance, points 15 to 16
14

Alloy Composition

Carbon (C), % 0 to 0.1
0.050 to 0.25
Chromium (Cr), % 16.5 to 18.5
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 1.0 to 2.5
0
Iron (Fe), % 62.7 to 72.5
9.7 to 24.5
Manganese (Mn), % 5.5 to 9.5
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 4.5 to 5.5
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.15
0
Phosphorus (P), % 0 to 0.070
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