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R30075 Cobalt vs. Grade 250 Maraging Steel

R30075 cobalt belongs to the cobalt alloys classification, while grade 250 maraging steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is grade 250 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
190
Elongation at Break, % 12
7.3 to 17
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 82 to 98
75
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
970 to 1800
Tensile Strength: Yield (Proof), MPa 480 to 840
660 to 1740

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1480
Melting Onset (Solidus), °C 1290
1430
Specific Heat Capacity, J/kg-K 450
450
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.2
Embodied Carbon, kg CO2/kg material 8.1
4.9
Embodied Energy, MJ/kg 110
65
Embodied Water, L/kg 530
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
130 to 150
Stiffness to Weight: Axial, points 14 to 17
13
Stiffness to Weight: Bending, points 24 to 25
23
Strength to Weight: Axial, points 26 to 42
33 to 61
Strength to Weight: Bending, points 22 to 31
26 to 40
Thermal Shock Resistance, points 21 to 29
29 to 54

Alloy Composition

Aluminum (Al), % 0 to 0.1
0.050 to 0.15
Boron (B), % 0 to 0.010
0 to 0.0030
Calcium (Ca), % 0
0 to 0.050
Carbon (C), % 0 to 0.35
0 to 0.030
Chromium (Cr), % 27 to 30
0
Cobalt (Co), % 58.7 to 68
7.0 to 8.5
Iron (Fe), % 0 to 0.75
66.3 to 71.1
Manganese (Mn), % 0 to 1.0
0 to 0.1
Molybdenum (Mo), % 5.0 to 7.0
4.6 to 5.2
Nickel (Ni), % 0 to 0.5
17 to 19
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.010
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0 to 0.1
0.3 to 0.5
Tungsten (W), % 0 to 0.2
0
Zirconium (Zr), % 0
0 to 0.020

Comparable Variants