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Grade 20 Cast Iron vs. Nickel 718

Grade 20 cast iron belongs to the iron alloys classification, while nickel 718 belongs to the nickel alloys. There are 30 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 grade 20 cast iron and the bottom bar is nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 9.6
12 to 50
Fatigue Strength, MPa 69
460 to 760
Fracture Toughness, MPa-m1/2 10
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 69
75
Shear Strength, MPa 180
660 to 950
Tensile Strength: Ultimate (UTS), MPa 160
930 to 1530
Tensile Strength: Yield (Proof), MPa 98
510 to 1330

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Melting Completion (Liquidus), °C 1380
1340
Melting Onset (Solidus), °C 1180
1260
Specific Heat Capacity, J/kg-K 490
450
Thermal Conductivity, W/m-K 46
11
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
1.5

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
75
Density, g/cm3 7.5
8.3
Embodied Carbon, kg CO2/kg material 1.5
13
Embodied Energy, MJ/kg 21
190
Embodied Water, L/kg 44
250

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13
140 to 390
Resilience: Unit (Modulus of Resilience), kJ/m3 27
660 to 4560
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 5.8
31 to 51
Strength to Weight: Bending, points 8.7
25 to 35
Thermal Diffusivity, mm2/s 13
3.0
Thermal Shock Resistance, points 6.0
27 to 44

Alloy Composition

Aluminum (Al), % 0
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 3.1 to 3.4
0 to 0.080
Chromium (Cr), % 0
17 to 21
Cobalt (Co), % 0
0 to 1.0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 92.1 to 93.9
11.1 to 24.6
Manganese (Mn), % 0.5 to 0.7
0 to 0.35
Molybdenum (Mo), % 0
2.8 to 3.3
Nickel (Ni), % 0
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Phosphorus (P), % 0 to 0.9
0 to 0.015
Silicon (Si), % 2.5 to 2.8
0 to 0.35
Sulfur (S), % 0 to 0.15
0 to 0.015
Titanium (Ti), % 0
0.65 to 1.2