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AISI 439 Stainless Steel vs. Ductile Cast Iron

Both AISI 439 stainless steel and ductile cast iron are iron alloys. They have 80% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AISI 439 stainless steel and the bottom bar is ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
160 to 310
Elastic (Young's, Tensile) Modulus, GPa 200
170 to 180
Elongation at Break, % 23
2.1 to 20
Poisson's Ratio 0.28
0.28 to 0.31
Shear Modulus, GPa 77
64 to 70
Shear Strength, MPa 310
420 to 800
Tensile Strength: Ultimate (UTS), MPa 490
460 to 920
Tensile Strength: Yield (Proof), MPa 250
310 to 670

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 890
290
Melting Completion (Liquidus), °C 1510
1160
Melting Onset (Solidus), °C 1430
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 3.4
8.8 to 9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
1.9
Density, g/cm3 7.7
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 2.3
1.5
Embodied Energy, MJ/kg 34
21
Embodied Water, L/kg 120
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
17 to 80
Resilience: Unit (Modulus of Resilience), kJ/m3 160
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 18
17 to 35
Strength to Weight: Bending, points 18
18 to 29
Thermal Diffusivity, mm2/s 6.7
8.9 to 10
Thermal Shock Resistance, points 16
17 to 35

Alloy Composition

Aluminum (Al), % 0 to 0.15
0
Carbon (C), % 0 to 0.030
3.0 to 3.5
Chromium (Cr), % 17 to 19
0
Iron (Fe), % 77.1 to 82.8
93.7 to 95.5
Manganese (Mn), % 0 to 1.0
0
Nickel (Ni), % 0 to 0.5
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.080
Silicon (Si), % 0 to 1.0
1.5 to 2.8
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0.2 to 1.1
0