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AISI 409 Stainless Steel vs. Ductile Cast Iron

Both AISI 409 stainless steel and ductile cast iron are iron alloys. They have 88% of their average alloy composition in common. There are 29 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 AISI 409 stainless steel and the bottom bar is ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
170 to 180
Elongation at Break, % 24
2.1 to 20
Poisson's Ratio 0.28
0.28 to 0.31
Shear Modulus, GPa 75
64 to 70
Shear Strength, MPa 270
420 to 800
Tensile Strength: Ultimate (UTS), MPa 420
460 to 920
Tensile Strength: Yield (Proof), MPa 200
310 to 670

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 710
290
Melting Completion (Liquidus), °C 1450
1160
Melting Onset (Solidus), °C 1400
1120
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 25
31 to 36
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
8.8 to 9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
1.9
Density, g/cm3 7.7
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 28
21
Embodied Water, L/kg 94
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
17 to 80
Resilience: Unit (Modulus of Resilience), kJ/m3 100
280 to 1330
Stiffness to Weight: Axial, points 14
12 to 14
Stiffness to Weight: Bending, points 25
24 to 26
Strength to Weight: Axial, points 15
17 to 35
Strength to Weight: Bending, points 16
18 to 29
Thermal Diffusivity, mm2/s 6.7
8.9 to 10
Thermal Shock Resistance, points 15
17 to 35

Alloy Composition

Carbon (C), % 0 to 0.080
3.0 to 3.5
Chromium (Cr), % 10.5 to 11.7
0
Iron (Fe), % 84.9 to 89.5
93.7 to 95.5
Manganese (Mn), % 0 to 1.0
0
Nickel (Ni), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.045
0 to 0.080
Silicon (Si), % 0 to 1.0
1.5 to 2.8
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0 to 0.75
0