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Grade 27 Titanium vs. ACI-ASTM CN3M Steel

Grade 27 titanium belongs to the titanium alloys classification, while ACI-ASTM CN3M steel belongs to the iron alloys. There are 29 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 grade 27 titanium and the bottom bar is ACI-ASTM CN3M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 27
34
Fatigue Strength, MPa 170
150
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 41
80
Tensile Strength: Ultimate (UTS), MPa 270
500
Tensile Strength: Yield (Proof), MPa 230
190

Thermal Properties

Latent Heat of Fusion, J/g 420
310
Maximum Temperature: Mechanical, °C 320
1100
Melting Completion (Liquidus), °C 1660
1450
Melting Onset (Solidus), °C 1610
1400
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 21
13
Thermal Expansion, µm/m-K 8.7
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 37
31
Density, g/cm3 4.5
8.1
Embodied Carbon, kg CO2/kg material 33
5.9
Embodied Energy, MJ/kg 530
80
Embodied Water, L/kg 320
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
130
Resilience: Unit (Modulus of Resilience), kJ/m3 240
89
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 17
17
Strength to Weight: Bending, points 21
17
Thermal Diffusivity, mm2/s 8.8
3.4
Thermal Shock Resistance, points 21
11

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 0
20 to 22
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
42.4 to 52.5
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0
4.5 to 5.5
Nickel (Ni), % 0
23 to 27
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.030
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0