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R30155 Cobalt vs. AISI 418 Stainless Steel

Both R30155 cobalt and AISI 418 stainless steel are iron alloys. They have 49% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
330
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
17
Fatigue Strength, MPa 310
520
Poisson's Ratio 0.29
0.28
Reduction in Area, % 34
50
Shear Modulus, GPa 81
77
Shear Strength, MPa 570
680
Tensile Strength: Ultimate (UTS), MPa 850
1100
Tensile Strength: Yield (Proof), MPa 390
850

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 570
390
Maximum Temperature: Mechanical, °C 1100
770
Melting Completion (Liquidus), °C 1470
1500
Melting Onset (Solidus), °C 1420
1460
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
25
Thermal Expansion, µm/m-K 14
10

Otherwise Unclassified Properties

Base Metal Price, % relative 80
15
Density, g/cm3 8.5
8.0
Embodied Carbon, kg CO2/kg material 9.7
2.9
Embodied Energy, MJ/kg 150
41
Embodied Water, L/kg 300
110

Common Calculations

PREN (Pitting Resistance) 37
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
170
Resilience: Unit (Modulus of Resilience), kJ/m3 370
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
38
Strength to Weight: Bending, points 24
29
Thermal Diffusivity, mm2/s 3.2
6.7
Thermal Shock Resistance, points 21
40

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.15 to 0.2
Chromium (Cr), % 20 to 22.5
12 to 14
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
78.5 to 83.6
Manganese (Mn), % 1.0 to 2.0
0 to 0.5
Molybdenum (Mo), % 2.5 to 3.5
0 to 0.5
Nickel (Ni), % 19 to 21
1.8 to 2.2
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
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
2.5 to 3.5