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ASTM A387 Grade 2 Steel vs. EN 2.4964 Cobalt

ASTM A387 grade 2 steel belongs to the iron alloys classification, while EN 2.4964 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 2 steel and the bottom bar is EN 2.4964 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 25
40
Fatigue Strength, MPa 190 to 250
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
86
Tensile Strength: Ultimate (UTS), MPa 470 to 550
960
Tensile Strength: Yield (Proof), MPa 260 to 350
390

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1470
1630
Melting Onset (Solidus), °C 1420
1550
Specific Heat Capacity, J/kg-K 470
400
Thermal Conductivity, W/m-K 45
15
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.9
9.6
Embodied Carbon, kg CO2/kg material 1.6
9.8
Embodied Energy, MJ/kg 20
140
Embodied Water, L/kg 50
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
310
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 320
340
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 16 to 20
28
Strength to Weight: Bending, points 17 to 19
23
Thermal Diffusivity, mm2/s 12
3.9
Thermal Shock Resistance, points 14 to 16
25

Alloy Composition

Carbon (C), % 0.050 to 0.21
0.050 to 0.15
Chromium (Cr), % 0.5 to 0.8
19 to 21
Cobalt (Co), % 0
46.4 to 58
Iron (Fe), % 97.1 to 98.3
0 to 3.0
Manganese (Mn), % 0.55 to 0.8
0 to 2.0
Molybdenum (Mo), % 0.45 to 0.6
0
Nickel (Ni), % 0
9.0 to 11
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0.15 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.025
0 to 0.015
Tungsten (W), % 0
14 to 16