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Grade 250 Maraging Steel vs. R31537 Cobalt

Grade 250 maraging steel belongs to the iron alloys classification, while R31537 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 250 maraging steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 7.3 to 17
14 to 23
Poisson's Ratio 0.3
0.29
Rockwell C Hardness 30 to 53
25 to 35
Shear Modulus, GPa 75
87
Tensile Strength: Ultimate (UTS), MPa 970 to 1800
1000 to 1340
Tensile Strength: Yield (Proof), MPa 660 to 1740
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 4.9
8.1
Embodied Energy, MJ/kg 65
110
Embodied Water, L/kg 140
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130 to 150
140 to 200
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 33 to 61
33 to 44
Strength to Weight: Bending, points 26 to 40
26 to 32
Thermal Shock Resistance, points 29 to 54
24 to 32

Alloy Composition

Aluminum (Al), % 0.050 to 0.15
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), % 7.0 to 8.5
58.9 to 69
Iron (Fe), % 66.3 to 71.1
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), % 17 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), % 0.3 to 0.5
0
Zirconium (Zr), % 0 to 0.020
0

Comparable Variants