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Grey Cast Iron vs. S31727 Stainless Steel

Both grey cast iron and S31727 stainless steel are iron alloys. They have 59% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is grey cast iron and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
190
Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6
40
Fatigue Strength, MPa 69 to 170
240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
78
Shear Strength, MPa 180 to 610
430
Tensile Strength: Ultimate (UTS), MPa 160 to 450
630
Tensile Strength: Yield (Proof), MPa 98 to 290
270

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1380
1440
Melting Onset (Solidus), °C 1180
1390
Specific Heat Capacity, J/kg-K 490
470
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
24
Density, g/cm3 7.5
8.0
Embodied Carbon, kg CO2/kg material 1.5
4.7
Embodied Energy, MJ/kg 21
64
Embodied Water, L/kg 44
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
200
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 5.8 to 17
22
Strength to Weight: Bending, points 8.7 to 17
20
Thermal Shock Resistance, points 6.0 to 17
14

Alloy Composition

Carbon (C), % 3.1 to 3.4
0 to 0.030
Chromium (Cr), % 0
17.5 to 19
Copper (Cu), % 0
2.8 to 4.0
Iron (Fe), % 92.1 to 93.9
53.7 to 61.3
Manganese (Mn), % 0.5 to 0.7
0 to 1.0
Molybdenum (Mo), % 0
3.8 to 4.5
Nickel (Ni), % 0
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0 to 0.9
0 to 0.030
Silicon (Si), % 2.5 to 2.8
0 to 1.0
Sulfur (S), % 0 to 0.15
0 to 0.030