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ASTM A387 Grade 22 Steel vs. R31538 Cobalt

ASTM A387 grade 22 steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 22 steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 21
13 to 23
Fatigue Strength, MPa 160 to 240
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
86
Tensile Strength: Ultimate (UTS), MPa 480 to 600
1020 to 1360
Tensile Strength: Yield (Proof), MPa 230 to 350
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1470
1360
Melting Onset (Solidus), °C 1430
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.4
Embodied Carbon, kg CO2/kg material 1.7
8.1
Embodied Energy, MJ/kg 23
110
Embodied Water, L/kg 58
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 85 to 110
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 320
750 to 1920
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17 to 21
34 to 45
Strength to Weight: Bending, points 17 to 20
27 to 32
Thermal Diffusivity, mm2/s 11
3.5
Thermal Shock Resistance, points 14 to 17
25 to 33

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.15 to 0.35
Chromium (Cr), % 2.0 to 2.5
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Iron (Fe), % 95.1 to 96.8
0 to 0.75
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0

Comparable Variants