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Grade 20 Cast Iron vs. Nickel 825

Grade 20 cast iron belongs to the iron alloys classification, while nickel 825 belongs to the nickel alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. 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 grade 20 cast iron and the bottom bar is nickel 825.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6
34
Fatigue Strength, MPa 69
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 69
78
Shear Strength, MPa 180
430
Tensile Strength: Ultimate (UTS), MPa 160
650
Tensile Strength: Yield (Proof), MPa 98
260

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1380
1400
Melting Onset (Solidus), °C 1180
1370
Specific Heat Capacity, J/kg-K 490
460
Thermal Conductivity, W/m-K 46
11
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
1.7

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
41
Density, g/cm3 7.5
8.2
Embodied Carbon, kg CO2/kg material 1.5
7.2
Embodied Energy, MJ/kg 21
100
Embodied Water, L/kg 44
230

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13
180
Resilience: Unit (Modulus of Resilience), kJ/m3 27
170
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 5.8
22
Strength to Weight: Bending, points 8.7
20
Thermal Diffusivity, mm2/s 13
2.9
Thermal Shock Resistance, points 6.0
17

Alloy Composition

Aluminum (Al), % 0
0 to 0.2
Carbon (C), % 3.1 to 3.4
0 to 0.050
Chromium (Cr), % 0
19.5 to 23.5
Copper (Cu), % 0
1.5 to 3.0
Iron (Fe), % 92.1 to 93.9
22 to 37.9
Manganese (Mn), % 0.5 to 0.7
0 to 1.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0
38 to 46
Phosphorus (P), % 0 to 0.9
0
Silicon (Si), % 2.5 to 2.8
0 to 0.050
Sulfur (S), % 0 to 0.15
0 to 0.030
Titanium (Ti), % 0
0.6 to 1.2