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Young’s Modulus of Cast Iron (E)

Typical Young’s modulus values of cast irons at room temperature are given below. Values are shown in GPa and in 106 psi.

Modulus of Elasticity Values for Cast Iron (Room Temperature)
Material Modulus of Elasticity, E
GPa 106 psi
Malleable Iron
Malleable Iron 170 25
Gray Cast Iron
ASTM A48 Class 20 66 – 97* 9.6 – 14*
ASTM A48 Class 25 79 – 102 11.5 – 14.8
ASTM A48 Class 30 90 – 113* 13.0 – 16.4*
ASTM A48 Class 40 110 – 138* 16 – 20*
ASTM A48 Class 50 130 – 157* 18.8 – 22.8*
Ductile Irons**
Grade 60-40-18 169 24.5
Grade 65-45-12 168 24.4
Grade 80-55-06 168 24.4
Grade 120-90-02 164 23.8

Note * Gray cast iron does not strictly obey Hooke’s law. The Young’s modulus in tension is commonly defined as the secant modulus: the slope of the line from the origin to the point at 25% of tensile strength on the stress–strain curve. Because gray iron’s modulus varies widely, measured strain should be used with a directly measured modulus for the specific specimen.

Note ** The tensile modulus of ductile iron typically lies in the range 162–170 GPa (≈ 23.5–24.5 × 106 psi) and does not vary greatly with grade.

Reference