ASTM A572 Steel vs. R31539 Cobalt

ASTM A572 steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ASTM A572 steel and the bottom bar is R31539 cobalt.

ASTM A572 HSLA Steel Dispersion Strengthened Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 3, R31539)

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		18 to 25
Elongation at Break, %		13 to 22

Fatigue Strength, MPa		240 to 340
Fatigue Strength, MPa		310 to 480

Poisson's Ratio		0.29
Poisson's Ratio		0.29

Shear Modulus, GPa		73
Shear Modulus, GPa		86

Tensile Strength: Ultimate (UTS), MPa		470 to 620
Tensile Strength: Ultimate (UTS), MPa		1000 to 1340

Tensile Strength: Yield (Proof), MPa		330 to 510
Tensile Strength: Yield (Proof), MPa		590 to 940

Thermal Properties

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

Melting Completion (Liquidus), °C		1460
Melting Completion (Liquidus), °C		1360

Melting Onset (Solidus), °C		1420
Melting Onset (Solidus), °C		1290

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

Thermal Conductivity, W/m-K		51
Thermal Conductivity, W/m-K		13

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		7.2
Electrical Conductivity: Equal Volume, % IACS		2.0

Electrical Conductivity: Equal Weight (Specific), % IACS		8.2 to 8.3
Electrical Conductivity: Equal Weight (Specific), % IACS		2.1

Otherwise Unclassified Properties

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

Embodied Carbon, kg CO₂/kg material		1.6
Embodied Carbon, kg CO₂/kg material		8.2

Embodied Energy, MJ/kg		22
Embodied Energy, MJ/kg		110

Embodied Water, L/kg		47
Embodied Water, L/kg		530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		100 to 110
Resilience: Ultimate (Unit Rupture Work), MJ/m³		140 to 190

Resilience: Unit (Modulus of Resilience), kJ/m³		290 to 690
Resilience: Unit (Modulus of Resilience), kJ/m³		780 to 2000

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

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

Strength to Weight: Axial, points		17 to 22
Strength to Weight: Axial, points		33 to 44

Strength to Weight: Bending, points		17 to 21
Strength to Weight: Bending, points		27 to 32

Thermal Diffusivity, mm²/s		14
Thermal Diffusivity, mm²/s		3.5

Thermal Shock Resistance, points		14 to 18
Thermal Shock Resistance, points		24 to 32