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Nickel 625 vs. R30075 Cobalt

Nickel 625 belongs to the nickel alloys classification, while R30075 cobalt belongs to the cobalt alloys. They have a modest 29% 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 (5, in this case) are not shown.

For each property being compared, the top bar is nickel 625 and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210 to 250
Elongation at Break, % 33 to 34
12
Fatigue Strength, MPa 240 to 320
250 to 840
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 79
82 to 98
Tensile Strength: Ultimate (UTS), MPa 790 to 910
780 to 1280
Tensile Strength: Yield (Proof), MPa 320 to 450
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Melting Completion (Liquidus), °C 1350
1360
Melting Onset (Solidus), °C 1290
1290
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 11
13
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.4
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.4
Embodied Carbon, kg CO2/kg material 14
8.1
Embodied Energy, MJ/kg 190
110
Embodied Water, L/kg 290
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220 to 250
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 260 to 490
560 to 1410
Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 23
24 to 25
Strength to Weight: Axial, points 26 to 29
26 to 42
Strength to Weight: Bending, points 22 to 24
22 to 31
Thermal Diffusivity, mm2/s 2.9
3.5
Thermal Shock Resistance, points 22 to 25
21 to 29

Alloy Composition

Aluminum (Al), % 0 to 0.4
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0 to 0.1
0 to 0.35
Chromium (Cr), % 20 to 23
27 to 30
Cobalt (Co), % 0 to 1.0
58.7 to 68
Iron (Fe), % 0 to 5.0
0 to 0.75
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 8.0 to 10
5.0 to 7.0
Nickel (Ni), % 58 to 68.9
0 to 0.5
Niobium (Nb), % 3.2 to 4.2
0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.015
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.010
Titanium (Ti), % 0 to 0.4
0 to 0.1
Tungsten (W), % 0
0 to 0.2

Comparable Variants