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SAE-AISI 9255 Steel vs. R30035 Cobalt

SAE-AISI 9255 steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 28 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 9255 steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220 to 230
Elongation at Break, % 21
9.0 to 46
Fatigue Strength, MPa 270
170 to 740
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
84 to 89
Tensile Strength: Ultimate (UTS), MPa 680
900 to 1900
Tensile Strength: Yield (Proof), MPa 390
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1430
1440
Melting Onset (Solidus), °C 1390
1320
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 46
11
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 2.0
100
Density, g/cm3 7.7
8.7
Embodied Carbon, kg CO2/kg material 1.5
10
Embodied Energy, MJ/kg 20
140
Embodied Water, L/kg 46
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 400
210 to 5920
Stiffness to Weight: Axial, points 13
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 24
29 to 61
Strength to Weight: Bending, points 22
24 to 39
Thermal Diffusivity, mm2/s 13
3.0
Thermal Shock Resistance, points 21
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0.51 to 0.59
0 to 0.025
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
29.1 to 39
Iron (Fe), % 96.2 to 97
0 to 1.0
Manganese (Mn), % 0.7 to 1.0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 0
33 to 37
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 1.8 to 2.2
0 to 0.15
Sulfur (S), % 0 to 0.040
0 to 0.010
Titanium (Ti), % 0
0 to 1.0