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Which of the following material is not used in alloy steels?

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in Casting-Forming-Welding II by (119k points)
Which of the following material is not used in alloy steels?

(a) Molybdenum

(b) Nickel

(c) Chromium

(d) Sodium

The question was posed to me in final exam.

Enquiry is from Welding of Various Metals topic in division Welding and Related Processes of Casting-Forming-Welding II

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Best answer
Right choice is (d) Sodium

To explain: In alloy steels, there is a big composition used up by iron. Along with iron, there vitally has to be carbon in alloy steels. Along with carbon, there is a presence of other elements such as, molybdenum, nickel and chromium in small amounts.

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