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Ductile Cast Iron vs. EN 1.4125 Stainless Steel

Both ductile cast iron and EN 1.4125 stainless steel are iron alloys. They have 82% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is EN 1.4125 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
250
Elastic (Young's, Tensile) Modulus, GPa 170 to 180
200
Elongation at Break, % 2.1 to 20
19
Poisson's Ratio 0.28 to 0.31
0.28
Shear Modulus, GPa 64 to 70
77
Shear Strength, MPa 420 to 800
500
Tensile Strength: Ultimate (UTS), MPa 460 to 920
800
Tensile Strength: Yield (Proof), MPa 310 to 670
470

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 290
870
Melting Completion (Liquidus), °C 1160
1430
Melting Onset (Solidus), °C 1120
1390
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 31 to 36
15
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
9.0
Density, g/cm3 7.1 to 7.5
7.7
Embodied Carbon, kg CO2/kg material 1.5
2.3
Embodied Energy, MJ/kg 21
32
Embodied Water, L/kg 43
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 80
130
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 1330
570
Stiffness to Weight: Axial, points 12 to 14
14
Stiffness to Weight: Bending, points 24 to 26
25
Strength to Weight: Axial, points 17 to 35
29
Strength to Weight: Bending, points 18 to 29
25
Thermal Diffusivity, mm2/s 8.9 to 10
4.1
Thermal Shock Resistance, points 17 to 35
29

Alloy Composition

Carbon (C), % 3.0 to 3.5
1.0 to 1.2
Chromium (Cr), % 0
16 to 18
Iron (Fe), % 93.7 to 95.5
78 to 82.7
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
0.4 to 0.8
Phosphorus (P), % 0 to 0.080
0 to 0.040
Silicon (Si), % 1.5 to 2.8
0 to 1.0
Sulfur (S), % 0
0 to 0.015