R30008 Cobalt vs. SAE-AISI A10 Steel

R30008 cobalt belongs to the cobalt alloys classification, while SAE-AISI A10 steel belongs to the iron alloys. There are 19 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 R30008 cobalt and the bottom bar is SAE-AISI A10 steel.

UNS R30008 (ASTM F1058 Grade 2) Cobalt SAE-AISI A10 (T30110) Air-Hardening Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		210
Elastic (Young's, Tensile) Modulus, GPa		190

Poisson's Ratio		0.29
Poisson's Ratio		0.29

Shear Modulus, GPa		83
Shear Modulus, GPa		72

Tensile Strength: Ultimate (UTS), MPa		950 to 1700
Tensile Strength: Ultimate (UTS), MPa		810 to 2040

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		270

Melting Completion (Liquidus), °C		1400
Melting Completion (Liquidus), °C		1440

Melting Onset (Solidus), °C		1330
Melting Onset (Solidus), °C		1400

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		480

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		12

Otherwise Unclassified Properties

Base Metal Price, % relative		95
Base Metal Price, % relative		5.0

Density, g/cm³		8.4
Density, g/cm³		7.8

Embodied Carbon, kg CO₂/kg material		8.1
Embodied Carbon, kg CO₂/kg material		2.1

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		27

Embodied Water, L/kg		400
Embodied Water, L/kg		56

Common Calculations

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

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		25

Strength to Weight: Axial, points		31 to 56
Strength to Weight: Axial, points		29 to 73

Strength to Weight: Bending, points		25 to 37
Strength to Weight: Bending, points		25 to 46

Thermal Shock Resistance, points		25 to 44
Thermal Shock Resistance, points		27 to 68

Alloy Composition

Boron (B), %		0 to 0.0010
Boron (B), %		0

Carbon (C), %		0 to 0.15
Carbon (C), %		1.3 to 1.5

Chromium (Cr), %		18.5 to 21.5
Chromium (Cr), %		0

Cobalt (Co), %		39 to 42
Cobalt (Co), %		0

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

Iron (Fe), %		7.6 to 20
Iron (Fe), %		90.8 to 93.4

Manganese (Mn), %		1.0 to 2.0
Manganese (Mn), %		1.6 to 2.1

Molybdenum (Mo), %		6.5 to 7.5
Molybdenum (Mo), %		1.3 to 1.8

Nickel (Ni), %		15 to 18
Nickel (Ni), %		1.6 to 2.1

Phosphorus (P), %		0 to 0.015
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0 to 1.2
Silicon (Si), %		1.0 to 1.5

Sulfur (S), %		0 to 0.015
Sulfur (S), %		0 to 0.030

Comparable Variants

Annealed Condition