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Automotive Grey Cast Iron vs. Grade 33 Titanium

Automotive grey cast iron belongs to the iron alloys classification, while grade 33 titanium belongs to the titanium alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is automotive grey cast iron and the bottom bar is grade 33 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
110
Elongation at Break, % 9.6 to 14
23
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 69 to 70
41
Tensile Strength: Ultimate (UTS), MPa 140 to 290
390
Tensile Strength: Yield (Proof), MPa 94 to 200
350

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
420
Melting Completion (Liquidus), °C 1380 to 1390
1660
Melting Onset (Solidus), °C 1340 to 1350
1610
Specific Heat Capacity, J/kg-K 490
540
Thermal Conductivity, W/m-K 41 to 43
21
Thermal Expansion, µm/m-K 12 to 14
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
6.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
55
Density, g/cm3 7.5 to 7.6
4.5
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
33
Embodied Energy, MJ/kg 21 to 24
530
Embodied Water, L/kg 44 to 51
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
86
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
590
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 5.2 to 11
24
Strength to Weight: Bending, points 8.0 to 13
26
Thermal Diffusivity, mm2/s 11 to 12
8.7
Thermal Shock Resistance, points 4.2 to 8.6
30