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SAE-AISI 1015 Steel vs. R30155 Cobalt

Both SAE-AISI 1015 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 1015 steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
220
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 20 to 32
34
Fatigue Strength, MPa 170 to 250
310
Poisson's Ratio 0.29
0.29
Reduction in Area, % 46 to 56
34
Shear Modulus, GPa 73
81
Shear Strength, MPa 260 to 270
570
Tensile Strength: Ultimate (UTS), MPa 390 to 440
850
Tensile Strength: Yield (Proof), MPa 210 to 370
390

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Maximum Temperature: Mechanical, °C 400
1100
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 52
12
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
80
Density, g/cm3 7.9
8.5
Embodied Carbon, kg CO2/kg material 1.4
9.7
Embodied Energy, MJ/kg 18
150
Embodied Water, L/kg 45
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
230
Resilience: Unit (Modulus of Resilience), kJ/m3 120 to 360
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 14 to 15
28
Strength to Weight: Bending, points 15 to 16
24
Thermal Diffusivity, mm2/s 14
3.2
Thermal Shock Resistance, points 12 to 14
21

Alloy Composition

Carbon (C), % 0.13 to 0.18
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iron (Fe), % 99.13 to 99.57
24.3 to 36.2
Manganese (Mn), % 0.3 to 0.6
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