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R30006 Cobalt vs. EN 1.3956 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while EN 1.3956 stainless steel belongs to the iron 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 (11, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is EN 1.3956 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
27
Fatigue Strength, MPa 260
240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
79
Tensile Strength: Ultimate (UTS), MPa 900
650
Tensile Strength: Yield (Proof), MPa 540
330

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1290
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
4.8
Embodied Energy, MJ/kg 110
68
Embodied Water, L/kg 500
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
150
Resilience: Unit (Modulus of Resilience), kJ/m3 670
270
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
23
Strength to Weight: Bending, points 24
21
Thermal Shock Resistance, points 26
18

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.060
Chromium (Cr), % 27 to 32
20.5 to 23.5
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
51.9 to 62.1
Manganese (Mn), % 0
4.0 to 6.0
Molybdenum (Mo), % 0 to 1.0
1.5 to 3.0
Nickel (Ni), % 0 to 3.0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 4.0 to 6.0
0
Vanadium (V), % 0
0.1 to 0.3