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SAE-AISI 9310 Steel vs. R30816 Cobalt

SAE-AISI 9310 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 (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 9310 steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 540 to 610
280
Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 17 to 19
23
Fatigue Strength, MPa 300 to 390
250
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 73
81
Tensile Strength: Ultimate (UTS), MPa 820 to 910
1020
Tensile Strength: Yield (Proof), MPa 450 to 570
460

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1460
1540
Melting Onset (Solidus), °C 1420
1460
Specific Heat Capacity, J/kg-K 470
420
Thermal Conductivity, W/m-K 48
13
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 7.9
9.1
Embodied Carbon, kg CO2/kg material 1.8
20
Embodied Energy, MJ/kg 24
320
Embodied Water, L/kg 57
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 150
190
Resilience: Unit (Modulus of Resilience), kJ/m3 540 to 860
510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 29 to 32
31
Strength to Weight: Bending, points 25 to 27
25
Thermal Diffusivity, mm2/s 13
3.3
Thermal Shock Resistance, points 24 to 27
28

Alloy Composition

Carbon (C), % 0.080 to 0.13
0.32 to 0.42
Chromium (Cr), % 1.0 to 1.4
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 93.8 to 95.2
0 to 5.0
Manganese (Mn), % 0.45 to 0.65
1.0 to 2.0
Molybdenum (Mo), % 0.080 to 0.15
3.5 to 4.5
Nickel (Ni), % 3.0 to 3.5
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0.2 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.012
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5