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ASTM A387 Grade 9 Steel vs. R31233 Cobalt

ASTM A387 grade 9 steel belongs to the iron alloys classification, while R31233 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 9 steel and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 20 to 21
17
Fatigue Strength, MPa 160 to 240
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
85
Tensile Strength: Ultimate (UTS), MPa 500 to 600
1020
Tensile Strength: Yield (Proof), MPa 230 to 350
420

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1410
1330
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 26
12
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.6
Embodied Carbon, kg CO2/kg material 2.1
8.4
Embodied Energy, MJ/kg 28
110
Embodied Water, L/kg 87
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
140
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 18 to 21
33
Strength to Weight: Bending, points 18 to 20
26
Thermal Diffusivity, mm2/s 6.9
3.2
Thermal Shock Resistance, points 14 to 17
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.15
0.020 to 0.1
Chromium (Cr), % 8.0 to 10
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Iron (Fe), % 87.1 to 90.8
1.0 to 5.0
Manganese (Mn), % 0.3 to 0.6
0.1 to 1.5
Molybdenum (Mo), % 0.9 to 1.1
4.0 to 6.0
Nickel (Ni), % 0
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.025
0 to 0.030
Silicon (Si), % 0 to 1.0
0.050 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0
Vanadium (V), % 0 to 0.040
0