R30021 Cobalt vs. SAE-AISI H41 Steel

R30021 cobalt belongs to the cobalt alloys classification, while SAE-AISI H41 steel belongs to the iron alloys. There are 20 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 R30021 cobalt and the bottom bar is SAE-AISI H41 steel.

UNS R30021 Co-Cr-W Alloy SAE-AISI H41 (T20841) Molybdenum Hot-Work Steel

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.29
Poisson's Ratio		0.29

Shear Modulus, GPa		86
Shear Modulus, GPa		77

Tensile Strength: Ultimate (UTS), MPa		700
Tensile Strength: Ultimate (UTS), MPa		710 to 2210

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		1560

Melting Onset (Solidus), °C		1190
Melting Onset (Solidus), °C		1510

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

Thermal Conductivity, W/m-K		15
Thermal Conductivity, W/m-K		28

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

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		8.1

Embodied Carbon, kg CO₂/kg material		8.0
Embodied Carbon, kg CO₂/kg material		6.8

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		97

Embodied Water, L/kg		520
Embodied Water, L/kg		97

Common Calculations

Stiffness to Weight: Axial, points		15
Stiffness to Weight: Axial, points		14

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

Strength to Weight: Axial, points		23
Strength to Weight: Axial, points		24 to 76

Strength to Weight: Bending, points		21
Strength to Weight: Bending, points		22 to 47

Thermal Diffusivity, mm²/s		3.8
Thermal Diffusivity, mm²/s		7.7

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		20 to 64

Alloy Composition

Carbon (C), %		0.2 to 0.35
Carbon (C), %		0.6 to 0.75

Chromium (Cr), %		26 to 29
Chromium (Cr), %		3.5 to 4.0

Cobalt (Co), %		61.7 to 67.3
Cobalt (Co), %		0

Iron (Fe), %		0 to 3.0
Iron (Fe), %		81.8 to 85

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

Molybdenum (Mo), %		4.5 to 6.0
Molybdenum (Mo), %		8.2 to 9.2

Nickel (Ni), %		2.0 to 3.0
Nickel (Ni), %		0

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

Silicon (Si), %		0 to 1.5
Silicon (Si), %		0.2 to 0.45

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

Tungsten (W), %		0
Tungsten (W), %		1.4 to 2.1

Vanadium (V), %		0
Vanadium (V), %		1.0 to 1.3