21.
Iron ore is usually found in the form of

22.
German silver contains

23.
Drop forging dies contain carbon of the order of

24.
Combined carbon in iron makes the metal

25.
Free carbon in iron makes the metal

26.
In mottled cast iron, carbon is available in

27.
The presence of hydrogen in steel causes

28.
Maximum percentage of carbon in austenite is

29.
The hardness and tensile strength in austenitic stainless steel can be increased by

30.
Machining properties of steel are improved by adding

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