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ACI-ASTM CA15M Steel vs. R30816 Cobalt

ACI-ASTM CA15M steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 27 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 ACI-ASTM CA15M steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
280
Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 20
23
Fatigue Strength, MPa 330
250
Poisson's Ratio 0.28
0.3
Reduction in Area, % 34
22
Shear Modulus, GPa 76
81
Tensile Strength: Ultimate (UTS), MPa 690
1020
Tensile Strength: Yield (Proof), MPa 510
460

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Melting Completion (Liquidus), °C 1450
1540
Melting Onset (Solidus), °C 1410
1460
Specific Heat Capacity, J/kg-K 480
420
Thermal Conductivity, W/m-K 27
13
Thermal Expansion, µm/m-K 10
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.1
Embodied Carbon, kg CO2/kg material 2.1
20
Embodied Energy, MJ/kg 29
320
Embodied Water, L/kg 100
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
190
Resilience: Unit (Modulus of Resilience), kJ/m3 670
510
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 25
31
Strength to Weight: Bending, points 22
25
Thermal Diffusivity, mm2/s 7.2
3.3
Thermal Shock Resistance, points 25
28

Alloy Composition

Carbon (C), % 0 to 0.15
0.32 to 0.42
Chromium (Cr), % 11.5 to 14
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 82.1 to 88.4
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0.15 to 1.0
3.5 to 4.5
Nickel (Ni), % 0 to 1.0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.65
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