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SAE-AISI 1084 Steel vs. R30155 Cobalt

Both SAE-AISI 1084 steel and R30155 cobalt are iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1084 steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 270
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 11
34
Fatigue Strength, MPa 320 to 370
310
Poisson's Ratio 0.29
0.29
Reduction in Area, % 28 to 45
34
Shear Modulus, GPa 72
81
Shear Strength, MPa 470 to 550
570
Tensile Strength: Ultimate (UTS), MPa 780 to 930
850
Tensile Strength: Yield (Proof), MPa 510 to 600
390

Thermal Properties

Latent Heat of Fusion, J/g 240
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 51
12
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
80
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.4
9.7
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 46
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 81 to 89
230
Resilience: Unit (Modulus of Resilience), kJ/m3 700 to 960
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 28 to 33
28
Strength to Weight: Bending, points 24 to 27
24
Thermal Diffusivity, mm2/s 14
3.2
Thermal Shock Resistance, points 25 to 30
21

Alloy Composition

Carbon (C), % 0.8 to 0.93
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 98.1 to 98.6
24.3 to 36.2
Manganese (Mn), % 0.6 to 0.9
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0