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Grade 20 Cast Iron vs. AWS BVAu-7

Grade 20 cast iron belongs to the iron alloys classification, while AWS BVAu-7 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.

For each property being compared, the top bar is grade 20 cast iron and the bottom bar is AWS BVAu-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
130
Poisson's Ratio 0.29
0.38
Shear Modulus, GPa 69
45
Tensile Strength: Ultimate (UTS), MPa 160
200

Thermal Properties

Latent Heat of Fusion, J/g 280
140
Melting Completion (Liquidus), °C 1380
1120
Melting Onset (Solidus), °C 1180
1100
Specific Heat Capacity, J/kg-K 490
240
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Density, g/cm3 7.5
15

Common Calculations

Stiffness to Weight: Axial, points 13
4.7
Stiffness to Weight: Bending, points 25
11
Strength to Weight: Axial, points 5.8
3.7
Strength to Weight: Bending, points 8.7
5.1
Thermal Shock Resistance, points 6.0
8.9

Alloy Composition

Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 3.1 to 3.4
0 to 0.0050
Cobalt (Co), % 0
0 to 0.060
Gold (Au), % 0
49.5 to 50.5
Iron (Fe), % 92.1 to 93.9
0
Lead (Pb), % 0
0 to 0.0020
Manganese (Mn), % 0.5 to 0.7
0
Nickel (Ni), % 0
24.5 to 25.5
Palladium (Pd), % 0
23.9 to 26
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