MakeItFrom.com
Menu (ESC)

R30075 Cobalt vs. ASTM A387 Grade 9 Steel

R30075 cobalt belongs to the cobalt alloys classification, while ASTM A387 grade 9 steel belongs to the iron 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 R30075 cobalt and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
190
Elongation at Break, % 12
20 to 21
Fatigue Strength, MPa 250 to 840
160 to 240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 82 to 98
75
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
500 to 600
Tensile Strength: Yield (Proof), MPa 480 to 840
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
26
Thermal Expansion, µm/m-K 12
13

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.1
Embodied Energy, MJ/kg 110
28
Embodied Water, L/kg 530
87

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
140 to 310
Stiffness to Weight: Axial, points 14 to 17
14
Stiffness to Weight: Bending, points 24 to 25
25
Strength to Weight: Axial, points 26 to 42
18 to 21
Strength to Weight: Bending, points 22 to 31
18 to 20
Thermal Diffusivity, mm2/s 3.5
6.9
Thermal Shock Resistance, points 21 to 29
14 to 17

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0 to 0.15
Chromium (Cr), % 27 to 30
8.0 to 10
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
87.1 to 90.8
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.9 to 1.1
Nickel (Ni), % 0 to 0.5
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.025
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0
Vanadium (V), % 0
0 to 0.040

Comparable Variants