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R30155 Cobalt vs. SAE-AISI 4028 Steel

Both R30155 cobalt and SAE-AISI 4028 steel are iron alloys. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is SAE-AISI 4028 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
150 to 190
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
14 to 23
Fatigue Strength, MPa 310
180 to 330
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Shear Strength, MPa 570
310 to 380
Tensile Strength: Ultimate (UTS), MPa 850
490 to 630
Tensile Strength: Yield (Proof), MPa 390
260 to 520

Thermal Properties

Latent Heat of Fusion, J/g 300
250
Maximum Temperature: Mechanical, °C 1100
400
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 12
49
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Base Metal Price, % relative 80
2.1
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 9.7
1.5
Embodied Energy, MJ/kg 150
19
Embodied Water, L/kg 300
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
81 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 370
180 to 720
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
17 to 22
Strength to Weight: Bending, points 24
18 to 21
Thermal Diffusivity, mm2/s 3.2
13
Thermal Shock Resistance, points 21
16 to 20

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.25 to 0.3
Chromium (Cr), % 20 to 22.5
0
Cobalt (Co), % 18.5 to 21
0
Iron (Fe), % 24.3 to 36.2
98.1 to 98.7
Manganese (Mn), % 1.0 to 2.0
0.7 to 0.9
Molybdenum (Mo), % 2.5 to 3.5
0.2 to 0.3
Nickel (Ni), % 19 to 21
0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0.035 to 0.050
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0