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EN 1.3975 Stainless Steel vs. G-CoCr28 Cobalt

EN 1.3975 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 25 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is EN 1.3975 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, % 27
6.7
Fatigue Strength, MPa 230
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
83
Tensile Strength: Ultimate (UTS), MPa 660
560
Tensile Strength: Yield (Proof), MPa 320
260

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Maximum Temperature: Mechanical, °C 910
1200
Melting Completion (Liquidus), °C 1360
1330
Melting Onset (Solidus), °C 1320
1270
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 15
100
Density, g/cm3 7.5
8.1
Embodied Carbon, kg CO2/kg material 3.3
6.2
Embodied Energy, MJ/kg 47
84
Embodied Water, L/kg 150
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
31
Resilience: Unit (Modulus of Resilience), kJ/m3 270
160
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 24
19
Strength to Weight: Bending, points 22
19
Thermal Shock Resistance, points 15
14

Alloy Composition

Carbon (C), % 0 to 0.050
0.050 to 0.25
Chromium (Cr), % 16 to 18
27 to 30
Cobalt (Co), % 0
48 to 52
Iron (Fe), % 58.2 to 65.4
9.7 to 24.5
Manganese (Mn), % 7.0 to 9.0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
0 to 0.5
Nickel (Ni), % 8.0 to 9.0
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030