R30021 Cobalt vs. Grade 300 Maraging Steel

R30021 cobalt belongs to the cobalt alloys classification, while grade 300 maraging steel belongs to the iron alloys. There are 23 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 R30021 cobalt and the bottom bar is grade 300 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa		1300
Compressive (Crushing) Strength, MPa		730 to 1880

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		190

Elongation at Break, %		9.0
Elongation at Break, %		6.5 to 18

Poisson's Ratio		0.29
Poisson's Ratio		0.3

Rockwell C Hardness		32
Rockwell C Hardness		31 to 56

Shear Modulus, GPa		86
Shear Modulus, GPa		75

Tensile Strength: Ultimate (UTS), MPa		700
Tensile Strength: Ultimate (UTS), MPa		1030 to 2030

Tensile Strength: Yield (Proof), MPa		500
Tensile Strength: Yield (Proof), MPa		760 to 1990

Thermal Properties

Latent Heat of Fusion, J/g		330
Latent Heat of Fusion, J/g		270

Melting Completion (Liquidus), °C		1350
Melting Completion (Liquidus), °C		1480

Melting Onset (Solidus), °C		1190
Melting Onset (Solidus), °C		1430

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		450

Thermal Expansion, µm/m-K		11
Thermal Expansion, µm/m-K		12

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		8.2

Embodied Carbon, kg CO₂/kg material		8.0
Embodied Carbon, kg CO₂/kg material		5.1

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		68

Embodied Water, L/kg		520
Embodied Water, L/kg		150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		57
Resilience: Ultimate (Unit Rupture Work), MJ/m³		130 to 170

Stiffness to Weight: Axial, points		15
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		23
Strength to Weight: Axial, points		35 to 68

Strength to Weight: Bending, points		21
Strength to Weight: Bending, points		28 to 43

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		31 to 62

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0.050 to 0.15

Boron (B), %		0
Boron (B), %		0 to 0.0030

Calcium (Ca), %		0
Calcium (Ca), %		0 to 0.050

Carbon (C), %		0.2 to 0.35
Carbon (C), %		0 to 0.030

Chromium (Cr), %		26 to 29
Chromium (Cr), %		0

Cobalt (Co), %		61.7 to 67.3
Cobalt (Co), %		8.5 to 9.5

Iron (Fe), %		0 to 3.0
Iron (Fe), %		65 to 68.4

Manganese (Mn), %		0
Manganese (Mn), %		0 to 0.1

Molybdenum (Mo), %		4.5 to 6.0
Molybdenum (Mo), %		4.6 to 5.2

Nickel (Ni), %		2.0 to 3.0
Nickel (Ni), %		18 to 19

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.010

Silicon (Si), %		0 to 1.5
Silicon (Si), %		0 to 0.1

Sulfur (S), %		0
Sulfur (S), %		0 to 0.010

Titanium (Ti), %		0
Titanium (Ti), %		0.5 to 0.8

Zirconium (Zr), %		0
Zirconium (Zr), %		0 to 0.020