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Grey Cast Iron vs. ACI-ASTM CK20 Steel

Both grey cast iron and ACI-ASTM CK20 steel are iron alloys. They have 54% 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 CK20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
150
Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6
37
Fatigue Strength, MPa 69 to 170
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
78
Tensile Strength: Ultimate (UTS), MPa 160 to 450
530
Tensile Strength: Yield (Proof), MPa 98 to 290
260

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Melting Completion (Liquidus), °C 1380
1400
Melting Onset (Solidus), °C 1180
1430
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 46
14
Thermal Expansion, µm/m-K 11
15

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
25
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
4.4
Embodied Energy, MJ/kg 21
62
Embodied Water, L/kg 44
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
160
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
170
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
3.7
Thermal Shock Resistance, points 6.0 to 17
13

Alloy Composition

Carbon (C), % 3.1 to 3.4
0 to 0.2
Chromium (Cr), % 0
23 to 27
Iron (Fe), % 92.1 to 93.9
46.7 to 58
Manganese (Mn), % 0.5 to 0.7
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
19 to 22
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