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ASTM B631 Class A vs. Grade 300 Maraging Steel

ASTM B631 class A belongs to the otherwise unclassified metals classification, while grade 300 maraging steel belongs to the iron alloys. There are 12 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class A and the bottom bar is grade 300 maraging steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.3
0.3
Shear Modulus, GPa 85 to 86
75

Thermal Properties

Latent Heat of Fusion, J/g 160
270
Melting Completion (Liquidus), °C 2680 to 2690
1480
Specific Heat Capacity, J/kg-K 160
450
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 15
8.2
Embodied Carbon, kg CO2/kg material 43
5.1
Embodied Energy, MJ/kg 670
68

Common Calculations

Stiffness to Weight: Axial, points 8.5
13
Stiffness to Weight: Bending, points 14
23