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What is the tensile strength of grade 220 iron?(a) 220 Dyne/mm^2(b) 220 N/m^2(c) 220 N/mm^2(d) 220 Dyne/cm^2This question was addressed to me during an online interview.Query is from Cupola Charge Calculations in portion Metal Furnace and Practice of Casting-Forming-Welding II

Answer»

The correct option is (c) 220 N/mm^2

Easiest explanation: ACCORDING to the STANDARDS of UK, the castings are made in a specified grade of IRON. Hence, iron having a grade of 220, is EQUIVALENT to iron having a TENSILE strength of 220 N/mm^2.



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