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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