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EN 1.4612 Stainless Steel vs. G-CoCr28 Cobalt

EN 1.4612 stainless steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 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 1.4612 stainless steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 11
6.7
Fatigue Strength, MPa 860 to 950
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 1690 to 1850
560
Tensile Strength: Yield (Proof), MPa 1570 to 1730
260

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Maximum Temperature: Mechanical, °C 790
1200
Melting Completion (Liquidus), °C 1450
1330
Melting Onset (Solidus), °C 1400
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 16
100
Density, g/cm3 7.9
8.1
Embodied Carbon, kg CO2/kg material 3.6
6.2
Embodied Energy, MJ/kg 50
84
Embodied Water, L/kg 140
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 210
31
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 60 to 65
19
Strength to Weight: Bending, points 40 to 43
19
Thermal Shock Resistance, points 58 to 63
14

Alloy Composition

Aluminum (Al), % 1.4 to 1.8
0
Carbon (C), % 0 to 0.015
0.050 to 0.25
Chromium (Cr), % 11 to 12.5
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 71.5 to 75.5
9.7 to 24.5
Manganese (Mn), % 0 to 0.1
0 to 1.5
Molybdenum (Mo), % 1.8 to 2.3
0 to 0.5
Nickel (Ni), % 10.2 to 11.3
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.010
0
Phosphorus (P), % 0 to 0.010
0 to 0.040
Silicon (Si), % 0 to 0.1
0.5 to 1.5
Sulfur (S), % 0 to 0.0050
0 to 0.030
Titanium (Ti), % 0.2 to 0.5
0