R30008 Cobalt vs. EN 1.7202 Steel

R30008 cobalt belongs to the cobalt alloys classification, while EN 1.7202 steel belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is EN 1.7202 steel.

UNS R30008 (ASTM F1058 Grade 2) Cobalt EN 1.7202 (37CrMo4) Chromium-Molybdenum 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		73

Tensile Strength: Ultimate (UTS), MPa		950 to 1700
Tensile Strength: Ultimate (UTS), MPa		530 to 1810

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		250

Melting Completion (Liquidus), °C		1400
Melting Completion (Liquidus), °C		1460

Melting Onset (Solidus), °C		1330
Melting Onset (Solidus), °C		1420

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		470

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

Otherwise Unclassified Properties

Base Metal Price, % relative		95
Base Metal Price, % relative		2.5

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

Embodied Carbon, kg CO₂/kg material		8.1
Embodied Carbon, kg CO₂/kg material		1.5

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		20

Embodied Water, L/kg		400
Embodied Water, L/kg		51

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		24

Strength to Weight: Axial, points		31 to 56
Strength to Weight: Axial, points		19 to 64

Strength to Weight: Bending, points		25 to 37
Strength to Weight: Bending, points		19 to 42

Thermal Shock Resistance, points		25 to 44
Thermal Shock Resistance, points		16 to 53

Alloy Composition

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

Carbon (C), %		0 to 0.15
Carbon (C), %		0.35 to 0.4

Chromium (Cr), %		18.5 to 21.5
Chromium (Cr), %		0.9 to 1.2

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), %		96.6 to 98

Manganese (Mn), %		1.0 to 2.0
Manganese (Mn), %		0.6 to 0.9

Molybdenum (Mo), %		6.5 to 7.5
Molybdenum (Mo), %		0.15 to 0.3

Nickel (Ni), %		15 to 18
Nickel (Ni), %		0

Phosphorus (P), %		0 to 0.015
Phosphorus (P), %		0 to 0.025

Silicon (Si), %		0 to 1.2
Silicon (Si), %		0 to 0.3

Sulfur (S), %		0 to 0.015
Sulfur (S), %		0 to 0.025