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EN 1.4310 Stainless Steel vs. R30012 Cobalt

EN 1.4310 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 22% 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 (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.4310 stainless steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 14 to 45
1.0
Fatigue Strength, MPa 240 to 330
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 730 to 900
830
Tensile Strength: Yield (Proof), MPa 260 to 570
650

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 18
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.8
Embodied Carbon, kg CO2/kg material 2.9
8.3
Embodied Energy, MJ/kg 42
120
Embodied Water, L/kg 140
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 260
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 830
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 26 to 32
26
Strength to Weight: Bending, points 23 to 27
22
Thermal Diffusivity, mm2/s 4.0
3.8
Thermal Shock Resistance, points 15 to 18
23

Alloy Composition

Carbon (C), % 0.050 to 0.15
1.4 to 2.0
Chromium (Cr), % 16 to 19
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 66.4 to 78
0 to 3.0
Manganese (Mn), % 0 to 2.0
0
Molybdenum (Mo), % 0 to 0.8
0 to 1.0
Nickel (Ni), % 6.0 to 9.5
0 to 3.0
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 2.0
0 to 2.0
Sulfur (S), % 0 to 0.015
0
Tungsten (W), % 0
7.5 to 9.5