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Grade 250 Maraging Steel vs. R30001 Cobalt

Grade 250 maraging steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is grade 250 maraging steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 730 to 1660
1930
Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 7.3 to 17
1.0
Poisson's Ratio 0.3
0.28
Rockwell C Hardness 30 to 53
55
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 970 to 1800
620

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1480
1530
Melting Onset (Solidus), °C 1430
1260
Specific Heat Capacity, J/kg-K 450
430
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.2
9.0
Embodied Carbon, kg CO2/kg material 4.9
8.9
Embodied Energy, MJ/kg 65
130
Embodied Water, L/kg 140
460

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 33 to 61
19
Strength to Weight: Bending, points 26 to 40
18
Thermal Shock Resistance, points 29 to 54
19

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
2.0 to 3.0
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 7.0 to 8.5
43 to 59
Iron (Fe), % 66.3 to 71.1
0 to 3.0
Manganese (Mn), % 0 to 0.1
0
Molybdenum (Mo), % 4.6 to 5.2
0 to 1.0
Nickel (Ni), % 17 to 19
0 to 3.0
Phosphorus (P), % 0 to 0.010
0
Silicon (Si), % 0 to 0.1
0 to 2.0
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0.3 to 0.5
0
Tungsten (W), % 0
11 to 13
Zirconium (Zr), % 0 to 0.020
0