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ASTM B631 Class A vs. AWS BNi-1a

ASTM B631 class A belongs to the otherwise unclassified metals classification, while AWS BNi-1a belongs to the nickel alloys. There are 12 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class A and the bottom bar is AWS BNi-1a.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
180
Poisson's Ratio 0.3
0.3
Shear Modulus, GPa 85 to 86
70

Thermal Properties

Latent Heat of Fusion, J/g 160
370
Melting Completion (Liquidus), °C 2680 to 2690
1080
Specific Heat Capacity, J/kg-K 160
500
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 15
8.0
Embodied Carbon, kg CO2/kg material 43
8.8
Embodied Energy, MJ/kg 670
120

Common Calculations

Stiffness to Weight: Axial, points 8.5
13
Stiffness to Weight: Bending, points 14
24