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Which of the following are true?

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+1 vote
in Machine Design by (86.7k points)
Which of the following are true?

(a) 7C4 grade steel is more ductile than 10C4

(b) Yield strength of 40C8 is greater than of 30C8

(c) Hardness of 30C8 is greater than of 40C8

(d) None of the mentioned

The question was asked at a job interview.

This question relates to the Plain Carbon Steels module in chapter Engineering Materials of Machine Design

1 Answer

0 votes
ago by (48.2k points)
The suitable answer is (a) 7C4 grade steel is more ductile than 10C4

Simply put: The number before “C” indicates measure of carbon. Hence a) is true as higher the carbon, lower the ductility.

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