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Grade 27 Titanium vs. ASTM A387 Grade 9 Steel

Grade 27 titanium belongs to the titanium alloys classification, while ASTM A387 grade 9 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 27
20 to 21
Fatigue Strength, MPa 170
160 to 240
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 41
75
Shear Strength, MPa 180
310 to 380
Tensile Strength: Ultimate (UTS), MPa 270
500 to 600
Tensile Strength: Yield (Proof), MPa 230
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 420
270
Maximum Temperature: Mechanical, °C 320
600
Melting Completion (Liquidus), °C 1660
1460
Melting Onset (Solidus), °C 1610
1410
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 21
26
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
10

Otherwise Unclassified Properties

Base Metal Price, % relative 37
6.5
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 33
2.1
Embodied Energy, MJ/kg 530
28
Embodied Water, L/kg 320
87

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 240
140 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 17
18 to 21
Strength to Weight: Bending, points 21
18 to 20
Thermal Diffusivity, mm2/s 8.8
6.9
Thermal Shock Resistance, points 21
14 to 17

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.15
Chromium (Cr), % 0
8.0 to 10
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
87.1 to 90.8
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.025
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 99 to 99.92
0
Vanadium (V), % 0
0 to 0.040
Residuals, % 0 to 0.4
0