121.
Iron ore is usually found in the form of

122.
German silver contains

123.
Drop forging dies contain carbon of the order of

124.
Combined carbon in iron makes the metal

125.
Free carbon in iron makes the metal

126.
In mottled cast iron, carbon is available in

127.
The presence of hydrogen in steel causes

128.
Maximum percentage of carbon in austenite is

129.
The hardness and tensile strength in austenitic stainless steel can be increased by

130.
Machining properties of steel are improved by adding

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