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Grade 20 Cast Iron vs. ASTM B817 Type I

Grade 20 cast iron belongs to the iron alloys classification, while ASTM B817 type I belongs to the titanium alloys. There are 28 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 ASTM B817 type I.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
100
Elongation at Break, % 9.6
4.0 to 13
Fatigue Strength, MPa 69
360 to 520
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 69
40
Tensile Strength: Ultimate (UTS), MPa 160
770 to 960
Tensile Strength: Yield (Proof), MPa 98
700 to 860

Thermal Properties

Latent Heat of Fusion, J/g 280
410
Melting Completion (Liquidus), °C 1380
1600
Melting Onset (Solidus), °C 1180
1550
Specific Heat Capacity, J/kg-K 490
560
Thermal Conductivity, W/m-K 46
7.1
Thermal Expansion, µm/m-K 11
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
1.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
36
Density, g/cm3 7.5
4.4
Embodied Carbon, kg CO2/kg material 1.5
38
Embodied Energy, MJ/kg 21
610
Embodied Water, L/kg 44
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13
30 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 27
2310 to 3540
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
35
Strength to Weight: Axial, points 5.8
48 to 60
Strength to Weight: Bending, points 8.7
42 to 49
Thermal Diffusivity, mm2/s 13
2.9
Thermal Shock Resistance, points 6.0
54 to 68

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.8
Carbon (C), % 3.1 to 3.4
0 to 0.1
Chlorine (Cl), % 0
0 to 0.2
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 92.1 to 93.9
0 to 0.4
Manganese (Mn), % 0.5 to 0.7
0
Nitrogen (N), % 0
0 to 0.040
Oxygen (O), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.9
0
Silicon (Si), % 2.5 to 2.8
0 to 0.1
Sodium (Na), % 0
0 to 0.2
Sulfur (S), % 0 to 0.15
0
Titanium (Ti), % 0
87 to 91
Vanadium (V), % 0
3.5 to 4.5
Residuals, % 0
0 to 0.4