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Automotive Malleable Cast Iron vs. S17400 Stainless Steel

Both automotive malleable cast iron and S17400 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is automotive malleable cast iron and the bottom bar is S17400 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 290
280 to 440
Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 1.0 to 10
11 to 21
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 70
75
Tensile Strength: Ultimate (UTS), MPa 350 to 720
910 to 1390
Tensile Strength: Yield (Proof), MPa 220 to 590
580 to 1250

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1410
1440
Melting Onset (Solidus), °C 1370
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 41
17
Thermal Expansion, µm/m-K 14
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
14
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.7
Embodied Energy, MJ/kg 20
39
Embodied Water, L/kg 45
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 30
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 950
880 to 4060
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 13 to 26
32 to 49
Strength to Weight: Bending, points 14 to 24
27 to 35
Thermal Diffusivity, mm2/s 11
4.5
Thermal Shock Resistance, points 9.9 to 21
30 to 46

Alloy Composition

Carbon (C), % 2.2 to 2.9
0 to 0.070
Chromium (Cr), % 0
15 to 17
Copper (Cu), % 0
3.0 to 5.0
Iron (Fe), % 93.6 to 96.7
70.4 to 78.9
Manganese (Mn), % 0.15 to 1.3
0 to 1.0
Nickel (Ni), % 0
3.0 to 5.0
Niobium (Nb), % 0
0.15 to 0.45
Phosphorus (P), % 0.020 to 0.15
0 to 0.040
Silicon (Si), % 0.9 to 1.9
0 to 1.0
Sulfur (S), % 0.020 to 0.2
0 to 0.030