21.
Corrosion resistance of steel is increased by addition of

22.
Depth of hardness of steel is increased by addition of

23.
By severely deforming a metal in a particular direction it becomes

24.
Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

25.
Which of the following statements are true for annealing of steels?

26.
Which is false statement about annealing?
Annealing is done to

27.
Eutectoid reaction occurs at

28.
When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

29.
Pick up the wrong statement

30.
Which of the following metal shrinks most from molten state to solid state?

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