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ASTM B817 Type II vs. ASTM B631 Class B

ASTM B817 type II belongs to the titanium alloys classification, while ASTM B631 class B belongs to the otherwise unclassified metals. There are 12 material properties with values for both materials. Properties with values for just one material (19, 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 B817 type II and the bottom bar is ASTM B631 class B.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
210
Poisson's Ratio 0.32
0.31
Shear Modulus, GPa 40
78 to 79

Thermal Properties

Latent Heat of Fusion, J/g 400
150
Melting Completion (Liquidus), °C 1580
2460 to 2480
Specific Heat Capacity, J/kg-K 550
170
Thermal Expansion, µm/m-K 9.9
12

Otherwise Unclassified Properties

Density, g/cm3 4.6
14
Embodied Carbon, kg CO2/kg material 40
49
Embodied Energy, MJ/kg 650
760

Common Calculations

Stiffness to Weight: Axial, points 13
8.1
Stiffness to Weight: Bending, points 34
14