R30001 Cobalt vs. SAE-AISI M4 Steel

R30001 cobalt belongs to the cobalt alloys classification, while SAE-AISI M4 steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30001 cobalt and the bottom bar is SAE-AISI M4 steel.

UNS R30001 Co-Cr-W Alloy SAE-AISI M4 (T11304) Molybdenum High-Speed Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		200

Poisson's Ratio		0.28
Poisson's Ratio		0.29

Shear Modulus, GPa		86
Shear Modulus, GPa		76

Tensile Strength: Ultimate (UTS), MPa		620
Tensile Strength: Ultimate (UTS), MPa		770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g		310
Latent Heat of Fusion, J/g		260

Melting Completion (Liquidus), °C		1530
Melting Completion (Liquidus), °C		1610

Melting Onset (Solidus), °C		1260
Melting Onset (Solidus), °C		1560

Specific Heat Capacity, J/kg-K		430
Specific Heat Capacity, J/kg-K		440

Thermal Conductivity, W/m-K		15
Thermal Conductivity, W/m-K		25

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

Otherwise Unclassified Properties

Density, g/cm³		9.0
Density, g/cm³		8.3

Embodied Carbon, kg CO₂/kg material		8.9
Embodied Carbon, kg CO₂/kg material		14

Embodied Energy, MJ/kg		130
Embodied Energy, MJ/kg		210

Embodied Water, L/kg		460
Embodied Water, L/kg		110

Common Calculations

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		22
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		19
Strength to Weight: Axial, points		26 to 72

Strength to Weight: Bending, points		18
Strength to Weight: Bending, points		23 to 45

Thermal Diffusivity, mm²/s		3.7
Thermal Diffusivity, mm²/s		6.9

Thermal Shock Resistance, points		19
Thermal Shock Resistance, points		24 to 68

Alloy Composition

Carbon (C), %		2.0 to 3.0
Carbon (C), %		1.3 to 1.4

Chromium (Cr), %		28 to 32
Chromium (Cr), %		3.8 to 4.8

Cobalt (Co), %		43 to 59
Cobalt (Co), %		0

Copper (Cu), %		0
Copper (Cu), %		0 to 0.25

Iron (Fe), %		0 to 3.0
Iron (Fe), %		75.9 to 81.4

Manganese (Mn), %		0
Manganese (Mn), %		0.15 to 0.4

Molybdenum (Mo), %		0 to 1.0
Molybdenum (Mo), %		4.3 to 5.5

Nickel (Ni), %		0 to 3.0
Nickel (Ni), %		0 to 0.3

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0 to 2.0
Silicon (Si), %		0.2 to 0.45

Sulfur (S), %		0
Sulfur (S), %		0 to 0.030

Tungsten (W), %		11 to 13
Tungsten (W), %		5.3 to 6.5

Vanadium (V), %		0
Vanadium (V), %		3.8 to 4.5