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ASTM A387 Grade 9 Steel vs. R30816 Cobalt

ASTM A387 grade 9 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (7, 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 R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
280
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 20 to 21
23
Fatigue Strength, MPa 160 to 240
250
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 75
81
Tensile Strength: Ultimate (UTS), MPa 500 to 600
1020
Tensile Strength: Yield (Proof), MPa 230 to 350
460

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 26
13
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 2.1
20
Embodied Energy, MJ/kg 28
320
Embodied Water, L/kg 87
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
190
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 18 to 21
31
Strength to Weight: Bending, points 18 to 20
25
Thermal Diffusivity, mm2/s 6.9
3.3
Thermal Shock Resistance, points 14 to 17
28

Alloy Composition

Carbon (C), % 0 to 0.15
0.32 to 0.42
Chromium (Cr), % 8.0 to 10
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 87.1 to 90.8
0 to 5.0
Manganese (Mn), % 0.3 to 0.6
1.0 to 2.0
Molybdenum (Mo), % 0.9 to 1.1
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Vanadium (V), % 0 to 0.040
0