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EN 1.3956 Stainless Steel vs. R30012 Cobalt

EN 1.3956 stainless steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is EN 1.3956 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, % 27
1.0
Fatigue Strength, MPa 240
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 79
86
Tensile Strength: Ultimate (UTS), MPa 650
830
Tensile Strength: Yield (Proof), MPa 330
650

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.8
Embodied Carbon, kg CO2/kg material 4.8
8.3
Embodied Energy, MJ/kg 68
120
Embodied Water, L/kg 180
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 270
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 23
26
Strength to Weight: Bending, points 21
22
Thermal Shock Resistance, points 18
23

Alloy Composition

Carbon (C), % 0 to 0.060
1.4 to 2.0
Chromium (Cr), % 20.5 to 23.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 51.9 to 62.1
0 to 3.0
Manganese (Mn), % 4.0 to 6.0
0
Molybdenum (Mo), % 1.5 to 3.0
0 to 1.0
Nickel (Ni), % 11.5 to 13.5
0 to 3.0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5
Vanadium (V), % 0.1 to 0.3
0