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SAE-AISI 9255 Steel vs. R30816 Cobalt

SAE-AISI 9255 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9255 steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
280
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 21
23
Fatigue Strength, MPa 270
250
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 72
81
Tensile Strength: Ultimate (UTS), MPa 680
1020
Tensile Strength: Yield (Proof), MPa 390
460

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1430
1540
Melting Onset (Solidus), °C 1390
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 46
13
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.1
Embodied Carbon, kg CO2/kg material 1.5
20
Embodied Energy, MJ/kg 20
320
Embodied Water, L/kg 46
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
190
Resilience: Unit (Modulus of Resilience), kJ/m3 400
510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 24
31
Strength to Weight: Bending, points 22
25
Thermal Diffusivity, mm2/s 13
3.3
Thermal Shock Resistance, points 21
28

Alloy Composition

Carbon (C), % 0.51 to 0.59
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 96.2 to 97
0 to 5.0
Manganese (Mn), % 0.7 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 1.8 to 2.2
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5