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Ductile Cast Iron vs. EN 1.7131 Steel

Both ductile cast iron and EN 1.7131 steel are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is EN 1.7131 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
140 to 170
Elastic (Young's, Tensile) Modulus, GPa 170 to 180
190
Poisson's Ratio 0.28 to 0.31
0.29
Shear Modulus, GPa 64 to 70
73
Tensile Strength: Ultimate (UTS), MPa 460 to 920
470 to 1390

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 290
420
Melting Completion (Liquidus), °C 1160
1460
Melting Onset (Solidus), °C 1120
1420
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 31 to 36
45
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
2.2
Density, g/cm3 7.1 to 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 21
19
Embodied Water, L/kg 43
51

Common Calculations

Stiffness to Weight: Axial, points 12 to 14
13
Stiffness to Weight: Bending, points 24 to 26
24
Strength to Weight: Axial, points 17 to 35
17 to 49
Strength to Weight: Bending, points 18 to 29
17 to 35
Thermal Diffusivity, mm2/s 8.9 to 10
12
Thermal Shock Resistance, points 17 to 35
14 to 41

Alloy Composition

Carbon (C), % 3.0 to 3.5
0.14 to 0.19
Chromium (Cr), % 0
0.8 to 1.1
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 93.7 to 95.5
96.8 to 98.1
Manganese (Mn), % 0
1.0 to 1.3
Phosphorus (P), % 0 to 0.080
0 to 0.025
Silicon (Si), % 1.5 to 2.8
0 to 0.3
Sulfur (S), % 0
0 to 0.025

Comparable Variants