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ASTM Grade 20 (ISO Grade 150, EN-JL 1020) Grey Cast Iron
General Form
Material Properties
Compressive (Crushing) Strength: 570 MPa (83 x 103 psi)
Density: 7.2 g/cm3 (450 lb/ft3)
Elastic (Young's, Tensile) Modulus: 66 to 97 GPa (9.6 to 14 x 106 psi)
Elongation at Break: 1 %
Fatigue Strength (Endurance Limit): 69 MPa (10 x 103 psi)
Fracture Toughness: 320 MPa-m1/2
Melting Onset (Solidus): 1090 °C (1990 °F)
Shear Strength: 179 MPa (26 x 103 psi)
Specific Heat Capacity: 450 J/kg-K
Strength to Weight Ratio: 19 to 21 kN-m/kg
Tensile Strength: Ultimate (UTS): 140 to 150 MPa (20 to 22 x 103 psi)
Tensile Strength: Yield (Proof): 98 MPa (14 x 103 psi)
Thermal Conductivity: 46 W/m-K
Thermal Diffusivity: 14
Thermal Expansion: 10.5 µm/m-K
See Also
ASTM A 48: Standard Specification for Gray Iron Castings
Cast Iron: Physical and Engineering Properties, Harold T. Angus, 1976
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

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