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Grade 31 Titanium vs. ACI-ASTM CN3MN Steel

Grade 31 titanium belongs to the titanium alloys classification, while ACI-ASTM CN3MN steel belongs to the iron alloys. There are 28 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 grade 31 titanium and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
210
Elongation at Break, % 20
39
Fatigue Strength, MPa 300
250
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 41
80
Tensile Strength: Ultimate (UTS), MPa 510
620
Tensile Strength: Yield (Proof), MPa 450
300

Thermal Properties

Latent Heat of Fusion, J/g 420
310
Maximum Temperature: Mechanical, °C 320
1100
Melting Completion (Liquidus), °C 1660
1460
Melting Onset (Solidus), °C 1610
1410
Specific Heat Capacity, J/kg-K 540
460
Thermal Conductivity, W/m-K 21
13
Thermal Expansion, µm/m-K 8.7
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 6.9
2.0

Otherwise Unclassified Properties

Density, g/cm3 4.5
8.1
Embodied Carbon, kg CO2/kg material 36
6.2
Embodied Energy, MJ/kg 600
84
Embodied Water, L/kg 230
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
200
Resilience: Unit (Modulus of Resilience), kJ/m3 940
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 32
21
Strength to Weight: Bending, points 32
20
Thermal Diffusivity, mm2/s 8.5
3.4
Thermal Shock Resistance, points 39
14

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.030
Chromium (Cr), % 0
20 to 22
Cobalt (Co), % 0.2 to 0.8
0
Copper (Cu), % 0
0 to 0.75
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.3
41.4 to 50.3
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0
6.0 to 7.0
Nickel (Ni), % 0
23.5 to 25.5
Nitrogen (N), % 0 to 0.050
0.18 to 0.26
Oxygen (O), % 0 to 0.35
0
Palladium (Pd), % 0.040 to 0.080
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 97.9 to 99.76
0
Residuals, % 0 to 0.4
0