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Ductile Cast Iron vs. ASTM A387 Grade 5 Steel

Both ductile cast iron and ASTM A387 grade 5 steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is ASTM A387 grade 5 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 170 to 180
190
Elongation at Break, % 2.1 to 20
20 to 21
Poisson's Ratio 0.28 to 0.31
0.29
Shear Modulus, GPa 64 to 70
74
Shear Strength, MPa 420 to 800
310 to 380
Tensile Strength: Ultimate (UTS), MPa 460 to 920
500 to 600
Tensile Strength: Yield (Proof), MPa 310 to 670
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 290
510
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
40
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
4.3
Density, g/cm3 7.1 to 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.7
Embodied Energy, MJ/kg 21
23
Embodied Water, L/kg 43
69

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 80
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 1330
140 to 320
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
18 to 21
Strength to Weight: Bending, points 18 to 29
18 to 20
Thermal Diffusivity, mm2/s 8.9 to 10
11
Thermal Shock Resistance, points 17 to 35
14 to 17

Alloy Composition

Carbon (C), % 3.0 to 3.5
0 to 0.15
Chromium (Cr), % 0
4.0 to 6.0
Iron (Fe), % 93.7 to 95.5
92.1 to 95.3
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.45 to 0.65
Phosphorus (P), % 0 to 0.080
0 to 0.025
Silicon (Si), % 1.5 to 2.8
0 to 0.5
Sulfur (S), % 0
0 to 0.025

Comparable Variants