ASTM Grade 20 (ISO Grade 150, EN-JL 1020) Grey Cast Iron

Grade 20 grey cast iron is a type of grey cast iron. It is furnished in the as-fabricated (no temper or treatment) condition.

Material Properties

Compressive (Crushing) Strength570 MPa (83 x 103 psi)

Density7.2 g/cm3 (450 lb/ft3)

Elastic (Young's, Tensile) Modulus82 GPa (12 x 106 psi)

Elongation at Break0.51 %

Fatigue Strength (Endurance Limit)69 MPa (10 x 103 psi)

Fracture Toughness10 MPa-m1/2

Melting Onset (Solidus)1180 °C (2160 °F)

Poisson's Ratio0.26

Shear Strength180 MPa (26 x 103 psi)

Strength to Weight Ratio21 kN-m/kg

Tensile Strength: Ultimate (UTS)150 MPa (22 x 103 psi)

Tensile Strength: Yield (Proof)98 MPa (14 x 103 psi)

Thermal Conductivity46 W/m-K

Thermal Expansion11 µm/m-K

Further Reading

ASTM A48: 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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