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ACI-ASTM CN7M Steel vs. Ductile Cast Iron

Both ACI-ASTM CN7M steel and ductile cast iron are iron alloys. They have 44% 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 ACI-ASTM CN7M steel and the bottom bar is ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
160 to 310
Elastic (Young's, Tensile) Modulus, GPa 200
170 to 180
Elongation at Break, % 44
2.1 to 20
Poisson's Ratio 0.28
0.28 to 0.31
Shear Modulus, GPa 77
64 to 70
Tensile Strength: Ultimate (UTS), MPa 480
460 to 920
Tensile Strength: Yield (Proof), MPa 200
310 to 670

Thermal Properties

Latent Heat of Fusion, J/g 310
270
Maximum Temperature: Mechanical, °C 1100
290
Melting Completion (Liquidus), °C 1410
1160
Melting Onset (Solidus), °C 1450
1120
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 21
31 to 36
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.8 to 9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 32
1.9
Density, g/cm3 8.1
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 5.6
1.5
Embodied Energy, MJ/kg 78
21
Embodied Water, L/kg 210
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
17 to 80
Resilience: Unit (Modulus of Resilience), kJ/m3 110
280 to 1330
Stiffness to Weight: Axial, points 14
12 to 14
Stiffness to Weight: Bending, points 24
24 to 26
Strength to Weight: Axial, points 17
17 to 35
Strength to Weight: Bending, points 17
18 to 29
Thermal Diffusivity, mm2/s 5.6
8.9 to 10
Thermal Shock Resistance, points 12
17 to 35

Alloy Composition

Carbon (C), % 0 to 0.070
3.0 to 3.5
Chromium (Cr), % 19 to 22
0
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
93.7 to 95.5
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 27.5 to 30.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.080
Silicon (Si), % 0 to 1.5
1.5 to 2.8
Sulfur (S), % 0 to 0.040
0