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Grey Cast Iron vs. ACI-ASTM CA6NM Steel

Both grey cast iron and ACI-ASTM CA6NM steel are iron alloys. They have 83% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (6, 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 CA6NM steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
250
Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6
17
Fatigue Strength, MPa 69 to 170
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
76
Tensile Strength: Ultimate (UTS), MPa 160 to 450
850
Tensile Strength: Yield (Proof), MPa 98 to 290
620

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Melting Completion (Liquidus), °C 1380
1450
Melting Onset (Solidus), °C 1180
1400
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 46
25
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
10
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.5
Embodied Energy, MJ/kg 21
34
Embodied Water, L/kg 44
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
130
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
1000
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 5.8 to 17
30
Strength to Weight: Bending, points 8.7 to 17
26
Thermal Diffusivity, mm2/s 13
6.7
Thermal Shock Resistance, points 6.0 to 17
31

Alloy Composition

Carbon (C), % 3.1 to 3.4
0 to 0.060
Chromium (Cr), % 0
11.5 to 14
Iron (Fe), % 92.1 to 93.9
78.4 to 84.6
Manganese (Mn), % 0.5 to 0.7
0 to 1.0
Molybdenum (Mo), % 0
0.4 to 1.0
Nickel (Ni), % 0
3.5 to 4.5
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 0.030