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S31730 Stainless Steel vs. Grey Cast Iron

Both S31730 stainless steel and grey cast iron are iron alloys. They have 58% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S31730 stainless steel and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 40
9.6
Fatigue Strength, MPa 170
69 to 170
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
69
Shear Strength, MPa 370
180 to 610
Tensile Strength: Ultimate (UTS), MPa 540
160 to 450
Tensile Strength: Yield (Proof), MPa 200
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1430
1380
Melting Onset (Solidus), °C 1390
1180
Specific Heat Capacity, J/kg-K 470
490
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Base Metal Price, % relative 24
1.9
Density, g/cm3 8.0
7.5
Embodied Carbon, kg CO2/kg material 4.6
1.5
Embodied Energy, MJ/kg 63
21
Embodied Water, L/kg 180
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 99
27 to 240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
5.8 to 17
Strength to Weight: Bending, points 18
8.7 to 17
Thermal Shock Resistance, points 12
6.0 to 17

Alloy Composition

Carbon (C), % 0 to 0.030
3.1 to 3.4
Chromium (Cr), % 17 to 19
0
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 52.4 to 61
92.1 to 93.9
Manganese (Mn), % 0 to 2.0
0.5 to 0.7
Molybdenum (Mo), % 3.0 to 4.0
0
Nickel (Ni), % 15 to 16.5
0
Nitrogen (N), % 0 to 0.045
0
Phosphorus (P), % 0 to 0.040
0 to 0.9
Silicon (Si), % 0 to 1.0
2.5 to 2.8
Sulfur (S), % 0 to 0.010
0 to 0.15