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SAE-AISI 1021 Steel vs. R31537 Cobalt

SAE-AISI 1021 steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 28 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 SAE-AISI 1021 steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 17 to 27
14 to 23
Fatigue Strength, MPa 190 to 300
310 to 480
Poisson's Ratio 0.29
0.29
Reduction in Area, % 46 to 54
13 to 23
Shear Modulus, GPa 73
87
Tensile Strength: Ultimate (UTS), MPa 480 to 530
1000 to 1340
Tensile Strength: Yield (Proof), MPa 260 to 450
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 52
13
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.0
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 1.4
8.1
Embodied Energy, MJ/kg 18
110
Embodied Water, L/kg 46
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 110
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 180 to 530
780 to 1990
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17 to 19
33 to 44
Strength to Weight: Bending, points 17 to 18
26 to 32
Thermal Diffusivity, mm2/s 14
3.4
Thermal Shock Resistance, points 15 to 17
24 to 32

Alloy Composition

Carbon (C), % 0.18 to 0.23
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 98.8 to 99.22
0 to 0.75
Manganese (Mn), % 0.6 to 0.9
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0

Comparable Variants