What should be the range of percentage of carbon (C) in iron (Fe) to be called as cast iron?(a) 0.1-0.5(b) 0.5-1.0(c) 1.0-2.0(d) 2.0-5.0This question was posed to me during an internship interview.My enquiry is from Cast Irons in portion Foundry Introduction & Materials of Casting-Forming-Welding II

What should be the range of percentage of carbon (C) in iron (Fe) to b

1.	What should be the range of percentage of carbon (C) in iron (Fe) to be called as cast iron?(a) 0.1-0.5(b) 0.5-1.0(c) 1.0-2.0(d) 2.0-5.0This question was posed to me during an internship interview.My enquiry is from Cast Irons in portion Foundry Introduction & Materials of Casting-Forming-Welding II
Answer» Correct answer is (d) 2.0-5.0 To explain I would say: Cast iron is the OLDEST ferrous material that is used for commercial purposes. It is mainly a MIXTURE of iron (Fe) and carbon (C). It can also include MATERIALS like sulfur (S), SILICON (Si), and manganese (Mn). Generally, for the cast iron, the percentage of carbon in iron is 2 to 5 PERCENT.

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