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Grade 27 Titanium vs. ASTM B685 Alloy

Grade 27 titanium belongs to the titanium alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
120
Poisson's Ratio 0.32
0.37
Shear Modulus, GPa 41
43
Tensile Strength: Ultimate (UTS), MPa 270
660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 420
180
Melting Completion (Liquidus), °C 1660
1230
Melting Onset (Solidus), °C 1610
1200
Specific Heat Capacity, J/kg-K 540
300
Thermal Expansion, µm/m-K 8.7
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
5.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
4.1

Otherwise Unclassified Properties

Density, g/cm3 4.5
11

Common Calculations

Stiffness to Weight: Axial, points 13
6.1
Stiffness to Weight: Bending, points 35
15
Strength to Weight: Axial, points 17
17 to 27
Strength to Weight: Bending, points 21
16 to 21
Thermal Shock Resistance, points 21
28 to 46

Alloy Composition

Aluminum (Al), % 0
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0 to 0.080
0
Copper (Cu), % 0
39.5 to 40.5
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Palladium (Pd), % 0
59 to 60.5
Ruthenium (Ru), % 0.080 to 0.14
0
Silver (Ag), % 0
0 to 0.1
Titanium (Ti), % 99 to 99.92
0
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0
0 to 0.2