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ACI-ASTM CK20 Steel vs. Grey Cast Iron

Both ACI-ASTM CK20 steel and grey cast iron 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 ACI-ASTM CK20 steel and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 25
1.9
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 4.4
1.5
Embodied Energy, MJ/kg 62
21
Embodied Water, L/kg 190
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 170
27 to 240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
5.8 to 17
Strength to Weight: Bending, points 19
8.7 to 17
Thermal Diffusivity, mm2/s 3.7
13
Thermal Shock Resistance, points 13
6.0 to 17

Alloy Composition

Carbon (C), % 0 to 0.2
3.1 to 3.4
Chromium (Cr), % 23 to 27
0
Iron (Fe), % 46.7 to 58
92.1 to 93.9
Manganese (Mn), % 0 to 2.0
0.5 to 0.7
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 19 to 22
0
Phosphorus (P), % 0 to 0.040
0 to 0.9
Silicon (Si), % 0 to 2.0
2.5 to 2.8
Sulfur (S), % 0 to 0.040
0 to 0.15