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Grey Cast Iron vs. ACI-ASTM CF20 Steel

Both grey cast iron and ACI-ASTM CF20 steel are iron alloys. They have 71% 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 CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
160
Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6
50
Fatigue Strength, MPa 69 to 170
240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
77
Tensile Strength: Ultimate (UTS), MPa 160 to 450
530
Tensile Strength: Yield (Proof), MPa 98 to 290
250

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1380
1420
Melting Onset (Solidus), °C 1180
1410
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 46
16
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
16
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
3.1
Embodied Energy, MJ/kg 21
44
Embodied Water, L/kg 44
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
220
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
160
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 5.8 to 17
19
Strength to Weight: Bending, points 8.7 to 17
19
Thermal Diffusivity, mm2/s 13
4.3
Thermal Shock Resistance, points 6.0 to 17
11

Alloy Composition

Carbon (C), % 3.1 to 3.4
0 to 0.2
Chromium (Cr), % 0
18 to 21
Iron (Fe), % 92.1 to 93.9
64.2 to 74
Manganese (Mn), % 0.5 to 0.7
0 to 1.5
Nickel (Ni), % 0
8.0 to 11
Phosphorus (P), % 0 to 0.9
0 to 0.040
Silicon (Si), % 2.5 to 2.8
0 to 2.0
Sulfur (S), % 0 to 0.15
0 to 0.040