ASTM B817 Type II vs. ASTM B631 Class A

ASTM B817 type II belongs to the titanium alloys classification, while ASTM B631 class A 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 A.

Metric UnitsUS Customary Units

Thermal Properties

Latent Heat of Fusion, J/g		400
Latent Heat of Fusion, J/g		160

Melting Completion (Liquidus), °C		1580
Melting Completion (Liquidus), °C		2680 to 2690

Specific Heat Capacity, J/kg-K		550
Specific Heat Capacity, J/kg-K		160

Thermal Expansion, µm/m-K		9.9
Thermal Expansion, µm/m-K		11

Elastic (Young's, Tensile) Modulus, GPa		100
Elastic (Young's, Tensile) Modulus, GPa		220

Poisson's Ratio		0.32
Poisson's Ratio		0.3

Shear Modulus, GPa		40
Shear Modulus, GPa		85 to 86

Density, g/cm³		4.6
Density, g/cm³		15

Embodied Carbon, kg CO₂/kg material		40
Embodied Carbon, kg CO₂/kg material		43

ASTM B817 Type II vs. ASTM B631 Class A

Mechanical Properties

Thermal Properties

Otherwise Unclassified Properties

Common Calculations

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Table of Contents

Stiffness to Weight: Axial, points		13
Stiffness to Weight: Axial, points		8.5

Stiffness to Weight: Bending, points		34
Stiffness to Weight: Bending, points		14

Embodied Energy, MJ/kg		650
Embodied Energy, MJ/kg		670