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C84400 Valve Metal vs. R30155 Cobalt

C84400 valve metal belongs to the copper alloys classification, while R30155 cobalt belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is C84400 valve metal and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
210
Elongation at Break, % 19
34
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 39
81
Tensile Strength: Ultimate (UTS), MPa 230
850
Tensile Strength: Yield (Proof), MPa 110
390

Thermal Properties

Latent Heat of Fusion, J/g 180
300
Maximum Temperature: Mechanical, °C 160
1100
Melting Completion (Liquidus), °C 1000
1470
Melting Onset (Solidus), °C 840
1420
Specific Heat Capacity, J/kg-K 370
450
Thermal Conductivity, W/m-K 72
12
Thermal Expansion, µm/m-K 19
14

Otherwise Unclassified Properties

Base Metal Price, % relative 29
80
Density, g/cm3 8.8
8.5
Embodied Carbon, kg CO2/kg material 2.8
9.7
Embodied Energy, MJ/kg 46
150
Embodied Water, L/kg 340
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 36
230
Resilience: Unit (Modulus of Resilience), kJ/m3 58
370
Stiffness to Weight: Axial, points 6.6
14
Stiffness to Weight: Bending, points 18
23
Strength to Weight: Axial, points 7.2
28
Strength to Weight: Bending, points 9.4
24
Thermal Diffusivity, mm2/s 22
3.2
Thermal Shock Resistance, points 8.3
21

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0
Antimony (Sb), % 0 to 0.25
0
Carbon (C), % 0
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 78 to 82
0
Iron (Fe), % 0 to 0.4
24.3 to 36.2
Lead (Pb), % 6.0 to 8.0
0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0 to 1.0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 1.5
0 to 0.040
Silicon (Si), % 0 to 0.0050
0 to 1.0
Sulfur (S), % 0 to 0.080
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tin (Sn), % 2.3 to 3.5
0
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 7.0 to 10
0
Residuals, % 0 to 0.7
0