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ACI-ASTM CN7M Steel vs. Automotive Malleable Cast Iron

Both ACI-ASTM CN7M steel and automotive malleable cast iron are iron alloys. They have 45% of their average alloy composition in common. There are 28 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 ACI-ASTM CN7M steel and the bottom bar is automotive malleable cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
130 to 290
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 44
1.0 to 10
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
70
Tensile Strength: Ultimate (UTS), MPa 480
350 to 720
Tensile Strength: Yield (Proof), MPa 200
220 to 590

Thermal Properties

Latent Heat of Fusion, J/g 310
260
Melting Completion (Liquidus), °C 1410
1410
Melting Onset (Solidus), °C 1450
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 21
41
Thermal Expansion, µm/m-K 15
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 32
1.9
Density, g/cm3 8.1
7.6
Embodied Carbon, kg CO2/kg material 5.6
1.5
Embodied Energy, MJ/kg 78
20
Embodied Water, L/kg 210
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
6.8 to 30
Resilience: Unit (Modulus of Resilience), kJ/m3 110
130 to 950
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
13 to 26
Strength to Weight: Bending, points 17
14 to 24
Thermal Diffusivity, mm2/s 5.6
11
Thermal Shock Resistance, points 12
9.9 to 21

Alloy Composition

Carbon (C), % 0 to 0.070
2.2 to 2.9
Chromium (Cr), % 19 to 22
0
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
93.6 to 96.7
Manganese (Mn), % 0 to 1.5
0.15 to 1.3
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 27.5 to 30.5
0
Phosphorus (P), % 0 to 0.040
0.020 to 0.15
Silicon (Si), % 0 to 1.5
0.9 to 1.9
Sulfur (S), % 0 to 0.040
0.020 to 0.2