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R30155 Cobalt vs. AISI 422 Stainless Steel

Both R30155 cobalt and AISI 422 stainless steel are iron alloys. They have 46% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is AISI 422 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
260 to 330
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 34
15 to 17
Fatigue Strength, MPa 310
410 to 500
Poisson's Ratio 0.29
0.28
Reduction in Area, % 34
34 to 40
Shear Modulus, GPa 81
76
Shear Strength, MPa 570
560 to 660
Tensile Strength: Ultimate (UTS), MPa 850
910 to 1080
Tensile Strength: Yield (Proof), MPa 390
670 to 870

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 570
380
Maximum Temperature: Mechanical, °C 1100
650
Melting Completion (Liquidus), °C 1470
1480
Melting Onset (Solidus), °C 1420
1470
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
24
Thermal Expansion, µm/m-K 14
10

Otherwise Unclassified Properties

Base Metal Price, % relative 80
11
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 9.7
3.1
Embodied Energy, MJ/kg 150
44
Embodied Water, L/kg 300
100

Common Calculations

PREN (Pitting Resistance) 37
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
140 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 370
1140 to 1910
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
32 to 38
Strength to Weight: Bending, points 24
26 to 30
Thermal Diffusivity, mm2/s 3.2
6.4
Thermal Shock Resistance, points 21
33 to 39

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.2 to 0.25
Chromium (Cr), % 20 to 22.5
11 to 12.5
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
81.9 to 85.8
Manganese (Mn), % 1.0 to 2.0
0.5 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
0.9 to 1.3
Nickel (Ni), % 19 to 21
0.5 to 1.0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0.9 to 1.3
Vanadium (V), % 0
0.2 to 0.3