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R30155 Cobalt vs. SAE-AISI H12 Steel

Both R30155 cobalt and SAE-AISI H12 steel are iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is SAE-AISI H12 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 850
690 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Melting Completion (Liquidus), °C 1470
1480
Melting Onset (Solidus), °C 1420
1440
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
36
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Base Metal Price, % relative 80
9.0
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 9.7
2.9
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 300
76

Common Calculations

PREN (Pitting Resistance) 37
12
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
24 to 65
Strength to Weight: Bending, points 24
22 to 42
Thermal Diffusivity, mm2/s 3.2
9.8
Thermal Shock Resistance, points 21
22 to 60

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.3 to 0.4
Chromium (Cr), % 20 to 22.5
4.8 to 5.5
Cobalt (Co), % 18.5 to 21
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 24.3 to 36.2
87.8 to 91.7
Manganese (Mn), % 1.0 to 2.0
0.2 to 0.5
Molybdenum (Mo), % 2.5 to 3.5
1.3 to 1.8
Nickel (Ni), % 19 to 21
0 to 0.3
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 1.0
0.8 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
1.0 to 1.7
Vanadium (V), % 0
0 to 0.5