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R30075 Cobalt vs. ASTM Grade HT Steel

R30075 cobalt belongs to the cobalt alloys classification, while ASTM grade HT 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 grade HT steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
190
Elongation at Break, % 12
4.6
Fatigue Strength, MPa 250 to 840
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 82 to 98
76
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
500
Tensile Strength: Yield (Proof), MPa 480 to 840
270

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1360
1390
Melting Onset (Solidus), °C 1290
1340
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
12
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.9

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.1
5.4
Embodied Energy, MJ/kg 110
76
Embodied Water, L/kg 530
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
19
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
180
Stiffness to Weight: Axial, points 14 to 17
13
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 26 to 42
18
Strength to Weight: Bending, points 22 to 31
18
Thermal Diffusivity, mm2/s 3.5
3.2
Thermal Shock Resistance, points 21 to 29
12

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.35 to 0.75
Chromium (Cr), % 27 to 30
15 to 19
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
38.2 to 51.7
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.5
Nickel (Ni), % 0 to 0.5
33 to 37
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.5
Sulfur (S), % 0 to 0.010
0 to 0.040
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0