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Grey Cast Iron vs. ACI-ASTM CN3MN Steel

Both grey cast iron and ACI-ASTM CN3MN steel are iron alloys. They have 47% 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 grey cast iron and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
180
Elastic (Young's, Tensile) Modulus, GPa 180
210
Elongation at Break, % 9.6
39
Fatigue Strength, MPa 69 to 170
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
80
Tensile Strength: Ultimate (UTS), MPa 160 to 450
620
Tensile Strength: Yield (Proof), MPa 98 to 290
300

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Melting Completion (Liquidus), °C 1380
1460
Melting Onset (Solidus), °C 1180
1410
Specific Heat Capacity, J/kg-K 490
460
Thermal Conductivity, W/m-K 46
13
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
33
Density, g/cm3 7.5
8.1
Embodied Carbon, kg CO2/kg material 1.5
6.2
Embodied Energy, MJ/kg 21
84
Embodied Water, L/kg 44
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
200
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
210
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 5.8 to 17
21
Strength to Weight: Bending, points 8.7 to 17
20
Thermal Diffusivity, mm2/s 13
3.4
Thermal Shock Resistance, points 6.0 to 17
14

Alloy Composition

Carbon (C), % 3.1 to 3.4
0 to 0.030
Chromium (Cr), % 0
20 to 22
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 92.1 to 93.9
41.4 to 50.3
Manganese (Mn), % 0.5 to 0.7
0 to 2.0
Molybdenum (Mo), % 0
6.0 to 7.0
Nickel (Ni), % 0
23.5 to 25.5
Nitrogen (N), % 0
0.18 to 0.26
Phosphorus (P), % 0 to 0.9
0 to 0.040
Silicon (Si), % 2.5 to 2.8
0 to 1.0
Sulfur (S), % 0 to 0.15
0 to 0.010