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ASTM B631 Class A vs. S41045 Stainless Steel

ASTM B631 class A belongs to the otherwise unclassified metals classification, while S41045 stainless steel belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class A and the bottom bar is S41045 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.3
0.28
Rockwell B Hardness 63 to 98
70
Shear Modulus, GPa 85 to 86
76

Thermal Properties

Latent Heat of Fusion, J/g 160
270
Melting Completion (Liquidus), °C 2680 to 2690
1450
Specific Heat Capacity, J/kg-K 160
480
Thermal Conductivity, W/m-K 420
29
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
3.3

Otherwise Unclassified Properties

Density, g/cm3 15
7.8
Embodied Carbon, kg CO2/kg material 43
2.2
Embodied Energy, MJ/kg 670
31

Common Calculations

Stiffness to Weight: Axial, points 8.5
14
Stiffness to Weight: Bending, points 14
25
Thermal Diffusivity, mm2/s 180
7.8