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ASTM B631 Class A vs. Grade 21 Titanium

ASTM B631 class A belongs to the otherwise unclassified metals classification, while grade 21 titanium belongs to the titanium alloys. There are 14 material properties with values for both materials. Properties with values for just one material (18, 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 21 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
140
Poisson's Ratio 0.3
0.32
Shear Modulus, GPa 85 to 86
51

Thermal Properties

Latent Heat of Fusion, J/g 160
410
Melting Completion (Liquidus), °C 2680 to 2690
1740
Specific Heat Capacity, J/kg-K 160
500
Thermal Conductivity, W/m-K 420
7.5
Thermal Expansion, µm/m-K 11
7.1

Otherwise Unclassified Properties

Density, g/cm3 15
5.4
Embodied Carbon, kg CO2/kg material 43
32
Embodied Energy, MJ/kg 670
490

Common Calculations

Stiffness to Weight: Axial, points 8.5
14
Stiffness to Weight: Bending, points 14
32
Thermal Diffusivity, mm2/s 180
2.8

Comparable Variants