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Grade 20 Cast Iron vs. AWS BVAu-8

Grade 20 cast iron belongs to the iron alloys classification, while AWS BVAu-8 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is grade 20 cast iron and the bottom bar is AWS BVAu-8.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
100
Poisson's Ratio 0.29
0.42
Shear Modulus, GPa 69
36
Tensile Strength: Ultimate (UTS), MPa 160
140

Thermal Properties

Latent Heat of Fusion, J/g 280
71
Melting Completion (Liquidus), °C 1380
1240
Melting Onset (Solidus), °C 1180
1200
Specific Heat Capacity, J/kg-K 490
140
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Density, g/cm3 7.5
19

Common Calculations

Stiffness to Weight: Axial, points 13
3.0
Stiffness to Weight: Bending, points 25
8.3
Strength to Weight: Axial, points 5.8
2.1
Strength to Weight: Bending, points 8.7
3.2
Thermal Shock Resistance, points 6.0
7.1

Alloy Composition

Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 3.1 to 3.4
0 to 0.0050
Gold (Au), % 0
91 to 93
Iron (Fe), % 92.1 to 93.9
0
Lead (Pb), % 0
0 to 0.0020
Manganese (Mn), % 0.5 to 0.7
0
Palladium (Pd), % 0
7.0 to 9.0
Phosphorus (P), % 0 to 0.9
0 to 0.0020
Silicon (Si), % 2.5 to 2.8
0
Sulfur (S), % 0 to 0.15
0
Zinc (Zn), % 0
0 to 0.0010