For the usual run of cast iron, The yield stength almost coincides with its fracture strength - cast iron is very brittle and fractures at usually more than 20000 pounds per square inch. DUCTILE cast iron is one of the several irons that DO yield before cracking.
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YIELD STRENGTH 242 N/sqmm TENSILE STRENGTH 440~520 N/sqmm
Yield strength - 13.8 MPa Ultimate tensile strength - 31 MPa
Cast Iron because of its strength and mass
Cast iron is very brittle in its basic form, with yield point very close to fracture point. However, glass is the most brittle, having no yield point - it is perfectly elastic before failure
Yes it is the same. Offset Yield strength = 0.2% Proof Stress