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ASTM B631 Class A vs. Grade 31 Titanium

ASTM B631 class A belongs to the otherwise unclassified metals classification, while grade 31 titanium belongs to the titanium alloys. There are 16 material properties with values for both materials. Properties with values for just one material (15, 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 ASTM B631 class A and the bottom bar is grade 31 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Poisson's Ratio 0.3
0.32
Shear Modulus, GPa 85 to 86
41

Thermal Properties

Latent Heat of Fusion, J/g 160
420
Melting Completion (Liquidus), °C 2680 to 2690
1660
Specific Heat Capacity, J/kg-K 160
540
Thermal Conductivity, W/m-K 420
21
Thermal Expansion, µm/m-K 11
8.7

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
6.9

Otherwise Unclassified Properties

Density, g/cm3 15
4.5
Embodied Carbon, kg CO2/kg material 43
36
Embodied Energy, MJ/kg 670
600

Common Calculations

Stiffness to Weight: Axial, points 8.5
13
Stiffness to Weight: Bending, points 14
35
Thermal Diffusivity, mm2/s 180
8.5