YOUNG'S MODULUS OF CAST IRON


Typical Young's modulus values of cast irons at room temperature are given in the following chart.

Modulus of Elasticity Values for Cast Iron
Material Modulus of Elasticity
GPa 106 psi
Malleable Iron 170 25
Gray Cast Iron
ASTM A 48 class 20 66 - 97 * 9.6 - 14 *
ASTM A 48 class 25 79 - 102 11.5 - 14.8
ASTM A 48 class 30 90 - 113 * 13.0 - 16.4 *
ASTM A 48 class 40 110 - 138 * 16 - 20 *
ASTM A 48 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 obey Hooke's law, and the Young's modulus in tension is usually determined arbitrarily as the slope of the line connecting the origin of the stress-strain curve with the point corresponding to 25% of the tensile strength (secant modulus). The Young's modulus of gray iron varies considerably. Thus, in using measured strain to calculate stress, it is essential to measure the modulus of the particular gray iron specimen being considered.

Note** :The modulus of elasticity of ductile iron in tension lies in the range of 162 to 170 GPa (23.5 × 106 to 24.5 × 106 psi) and does not vary greatly with grade.


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