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Grade 300 Maraging Steel vs. R31539 Cobalt

Grade 300 maraging steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 22 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 grade 300 maraging steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 6.5 to 18
13 to 22
Poisson's Ratio 0.3
0.29
Rockwell C Hardness 31 to 56
25 to 35
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 1030 to 2030
1000 to 1340
Tensile Strength: Yield (Proof), MPa 760 to 1990
590 to 940

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
13

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 170
140 to 190
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 35 to 68
33 to 44
Strength to Weight: Bending, points 28 to 43
27 to 32
Thermal Shock Resistance, points 31 to 62
24 to 32

Alloy Composition

Aluminum (Al), % 0.050 to 0.15
0.3 to 1.0
Boron (B), % 0 to 0.0030
0
Calcium (Ca), % 0 to 0.050
0
Carbon (C), % 0 to 0.030
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 8.5 to 9.5
57.7 to 68.7
Iron (Fe), % 65 to 68.4
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
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 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.010
0
Silicon (Si), % 0 to 0.1
0 to 1.0
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0.5 to 0.8
0
Zirconium (Zr), % 0 to 0.020
0

Comparable Variants