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Grey Cast Iron vs. S31655 Stainless Steel

Both grey cast iron and S31655 stainless steel are iron alloys. They have 69% 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 S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
210
Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6
39
Fatigue Strength, MPa 69 to 170
300
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
78
Shear Strength, MPa 180 to 610
490
Tensile Strength: Ultimate (UTS), MPa 160 to 450
710
Tensile Strength: Yield (Proof), MPa 98 to 290
350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1380
1430
Melting Onset (Solidus), °C 1180
1380
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 46
15
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
17
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.3
Embodied Energy, MJ/kg 21
46
Embodied Water, L/kg 44
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
230
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 5.8 to 17
25
Strength to Weight: Bending, points 8.7 to 17
23
Thermal Diffusivity, mm2/s 13
4.0
Thermal Shock Resistance, points 6.0 to 17
16

Alloy Composition

Carbon (C), % 3.1 to 3.4
0 to 0.030
Chromium (Cr), % 0
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 92.1 to 93.9
63.2 to 71.9
Manganese (Mn), % 0.5 to 0.7
0 to 2.0
Molybdenum (Mo), % 0
0.5 to 1.5
Nickel (Ni), % 0
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.9
0 to 0.045
Silicon (Si), % 2.5 to 2.8
0 to 1.0
Sulfur (S), % 0 to 0.15
0 to 0.015