Grey Cast Iron vs. AISI 431 Stainless Steel
Both grey cast iron and AISI 431 stainless steel are iron alloys. They have 82% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is grey cast iron and the bottom bar is AISI 431 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 160 to 300 | |
250 |
Elastic (Young's, Tensile) Modulus, GPa | 180 | |
200 |
Elongation at Break, % | 9.6 | |
15 to 17 |
Fatigue Strength, MPa | 69 to 170 | |
430 to 610 |
Poisson's Ratio | 0.29 | |
0.28 |
Shear Modulus, GPa | 69 | |
77 |
Shear Strength, MPa | 180 to 610 | |
550 to 840 |
Tensile Strength: Ultimate (UTS), MPa | 160 to 450 | |
890 to 1380 |
Tensile Strength: Yield (Proof), MPa | 98 to 290 | |
710 to 1040 |
Thermal Properties
Latent Heat of Fusion, J/g | 280 | |
280 |
Melting Completion (Liquidus), °C | 1380 | |
1510 |
Melting Onset (Solidus), °C | 1180 | |
1450 |
Specific Heat Capacity, J/kg-K | 490 | |
480 |
Thermal Conductivity, W/m-K | 46 | |
26 |
Thermal Expansion, µm/m-K | 11 | |
12 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
2.6 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.9 | |
3.0 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 1.9 | |
9.0 |
Density, g/cm3 | 7.5 | |
7.7 |
Embodied Carbon, kg CO2/kg material | 1.5 | |
2.2 |
Embodied Energy, MJ/kg | 21 | |
31 |
Embodied Water, L/kg | 44 | |
120 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 13 to 37 | |
140 to 180 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 27 to 240 | |
1270 to 2770 |
Stiffness to Weight: Axial, points | 13 | |
14 |
Stiffness to Weight: Bending, points | 25 | |
25 |
Strength to Weight: Axial, points | 5.8 to 17 | |
32 to 50 |
Strength to Weight: Bending, points | 8.7 to 17 | |
27 to 36 |
Thermal Diffusivity, mm2/s | 13 | |
7.0 |
Thermal Shock Resistance, points | 6.0 to 17 | |
28 to 43 |
Alloy Composition
Carbon (C), % | 3.1 to 3.4 | |
0 to 0.2 |
Chromium (Cr), % | 0 | |
15 to 17 |
Iron (Fe), % | 92.1 to 93.9 | |
78.2 to 83.8 |
Manganese (Mn), % | 0.5 to 0.7 | |
0 to 1.0 |
Nickel (Ni), % | 0 | |
1.3 to 2.5 |
Phosphorus (P), % | 0 to 0.9 | |
0 to 0.040 |
Silicon (Si), % | 2.5 to 2.8 | |
0 to 1.0 |
Sulfur (S), % | 0 to 0.15 | |
0 to 0.030 |