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S21800 Stainless Steel vs. Automotive Malleable Cast Iron

Both S21800 stainless steel and automotive malleable cast iron are iron alloys. They have 64% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is automotive malleable cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
130 to 290
Elastic (Young's, Tensile) Modulus, GPa 190
180
Elongation at Break, % 40
1.0 to 10
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
70
Tensile Strength: Ultimate (UTS), MPa 740
350 to 720
Tensile Strength: Yield (Proof), MPa 390
220 to 590

Thermal Properties

Latent Heat of Fusion, J/g 340
260
Melting Completion (Liquidus), °C 1360
1410
Melting Onset (Solidus), °C 1310
1370
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
14

Otherwise Unclassified Properties

Base Metal Price, % relative 15
1.9
Density, g/cm3 7.5
7.6
Embodied Carbon, kg CO2/kg material 3.1
1.5
Embodied Energy, MJ/kg 45
20
Embodied Water, L/kg 150
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
6.8 to 30
Resilience: Unit (Modulus of Resilience), kJ/m3 390
130 to 950
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
13 to 26
Strength to Weight: Bending, points 24
14 to 24
Thermal Shock Resistance, points 17
9.9 to 21

Alloy Composition

Carbon (C), % 0 to 0.1
2.2 to 2.9
Chromium (Cr), % 16 to 18
0
Iron (Fe), % 59.1 to 65.4
93.6 to 96.7
Manganese (Mn), % 7.0 to 9.0
0.15 to 1.3
Nickel (Ni), % 8.0 to 9.0
0
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0.020 to 0.15
Silicon (Si), % 3.5 to 4.5
0.9 to 1.9
Sulfur (S), % 0 to 0.030
0.020 to 0.2