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Grade 300 Maraging Steel vs. R30075 Cobalt

Grade 300 maraging steel belongs to the iron alloys classification, while R30075 cobalt belongs to the cobalt 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 grade 300 maraging steel and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210 to 250
Elongation at Break, % 6.5 to 18
12
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 75
82 to 98
Tensile Strength: Ultimate (UTS), MPa 1030 to 2030
780 to 1280
Tensile Strength: Yield (Proof), MPa 760 to 1990
480 to 840

Thermal Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.2
8.4
Embodied Carbon, kg CO2/kg material 5.1
8.1
Embodied Energy, MJ/kg 68
110
Embodied Water, L/kg 150
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 170
84 to 140
Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 23
24 to 25
Strength to Weight: Axial, points 35 to 68
26 to 42
Strength to Weight: Bending, points 28 to 43
22 to 31
Thermal Shock Resistance, points 31 to 62
21 to 29

Alloy Composition

Aluminum (Al), % 0.050 to 0.15
0 to 0.1
Boron (B), % 0 to 0.0030
0 to 0.010
Calcium (Ca), % 0 to 0.050
0
Carbon (C), % 0 to 0.030
0 to 0.35
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 8.5 to 9.5
58.7 to 68
Iron (Fe), % 65 to 68.4
0 to 0.75
Manganese (Mn), % 0 to 0.1
0 to 1.0
Molybdenum (Mo), % 4.6 to 5.2
5.0 to 7.0
Nickel (Ni), % 18 to 19
0 to 0.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.010
0 to 0.020
Silicon (Si), % 0 to 0.1
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0.5 to 0.8
0 to 0.1
Tungsten (W), % 0
0 to 0.2
Zirconium (Zr), % 0 to 0.020
0

Comparable Variants