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Grade 31 Titanium vs. ACI-ASTM CH20 Steel

Grade 31 titanium belongs to the titanium alloys classification, while ACI-ASTM CH20 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 CH20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Elongation at Break, % 20
38
Fatigue Strength, MPa 300
290
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 41
78
Tensile Strength: Ultimate (UTS), MPa 510
610
Tensile Strength: Yield (Proof), MPa 450
350

Thermal Properties

Latent Heat of Fusion, J/g 420
310
Maximum Temperature: Mechanical, °C 320
1100
Melting Completion (Liquidus), °C 1660
1410
Melting Onset (Solidus), °C 1610
1430
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 21
14
Thermal Expansion, µm/m-K 8.7
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 6.9
2.3

Otherwise Unclassified Properties

Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 36
3.7
Embodied Energy, MJ/kg 600
53
Embodied Water, L/kg 230
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 99
200
Resilience: Unit (Modulus of Resilience), kJ/m3 940
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 32
22
Strength to Weight: Bending, points 32
21
Thermal Diffusivity, mm2/s 8.5
3.7
Thermal Shock Resistance, points 39
15

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.2
Chromium (Cr), % 0
22 to 26
Cobalt (Co), % 0.2 to 0.8
0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.3
54.7 to 66
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
12 to 15
Nitrogen (N), % 0 to 0.050
0
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 2.0
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 97.9 to 99.76
0
Residuals, % 0 to 0.4
0