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ASTM A356 Grade 8 vs. Ductile Cast Iron

Both ASTM A356 grade 8 and ductile cast iron are iron alloys. They have a very high 95% 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 ASTM A356 grade 8 and the bottom bar is ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
160 to 310
Elastic (Young's, Tensile) Modulus, GPa 190
170 to 180
Elongation at Break, % 21
2.1 to 20
Poisson's Ratio 0.29
0.28 to 0.31
Shear Modulus, GPa 73
64 to 70
Tensile Strength: Ultimate (UTS), MPa 630
460 to 920
Tensile Strength: Yield (Proof), MPa 390
310 to 670

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 440
290
Melting Completion (Liquidus), °C 1470
1160
Melting Onset (Solidus), °C 1430
1120
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 38
31 to 36
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.8 to 9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
1.9
Density, g/cm3 7.8
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 2.0
1.5
Embodied Energy, MJ/kg 26
21
Embodied Water, L/kg 55
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
17 to 80
Resilience: Unit (Modulus of Resilience), kJ/m3 390
280 to 1330
Stiffness to Weight: Axial, points 13
12 to 14
Stiffness to Weight: Bending, points 24
24 to 26
Strength to Weight: Axial, points 22
17 to 35
Strength to Weight: Bending, points 21
18 to 29
Thermal Diffusivity, mm2/s 10
8.9 to 10
Thermal Shock Resistance, points 18
17 to 35

Alloy Composition

Carbon (C), % 0 to 0.2
3.0 to 3.5
Chromium (Cr), % 1.0 to 1.5
0
Iron (Fe), % 95.4 to 97.4
93.7 to 95.5
Manganese (Mn), % 0.5 to 0.9
0
Molybdenum (Mo), % 0.9 to 1.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.080
Silicon (Si), % 0.2 to 0.6
1.5 to 2.8
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.050 to 0.15
0