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SAE-AISI 81B45 Steel vs. Austenitic Grey Cast Iron

Both SAE-AISI 81B45 steel and austenitic grey cast iron are iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 81B45 steel and the bottom bar is austenitic grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 200
110 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
180
Poisson's Ratio 0.29
0.29 to 0.3
Shear Modulus, GPa 73
69 to 72
Tensile Strength: Ultimate (UTS), MPa 540 to 670
150 to 230

Thermal Properties

Latent Heat of Fusion, J/g 250
280 to 350
Melting Completion (Liquidus), °C 1460
1340 to 1400
Melting Onset (Solidus), °C 1420
1290 to 1350
Specific Heat Capacity, J/kg-K 470
470 to 490
Thermal Expansion, µm/m-K 12
13 to 14

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3
14 to 24
Density, g/cm3 7.8
7.7 to 8.1
Embodied Carbon, kg CO2/kg material 1.5
3.1 to 4.7
Embodied Energy, MJ/kg 20
43 to 65
Embodied Water, L/kg 49
93 to 120

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
23 to 25
Strength to Weight: Axial, points 19 to 24
5.3 to 8.2
Strength to Weight: Bending, points 19 to 22
7.9 to 11
Thermal Shock Resistance, points 17 to 21
4.5 to 6.5