21.
Which of the following display properties similar to that of steel?

22.
When low carbon steel is heated up to upper critical temperature

23.
When low carbon steel is heated up to lower critical temperature

24.
The lower critical temperature

25.
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

26.
The unit cells

27.
Pig iron is the name given to

28.
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

29.
Wrought iron is

30.
Which of the following alloys does not have copper as one of the constituents?

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