61. Cast iron is manufactured in
62. The molecules in a solid move
63. Hardness of upper bainite (acicular structure) is about
64. A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as
65. A reversible change in the atomic structure of steel with corresponding change in the properties is known as
66. Hardness of martensite is about
67. A coarse grained steel
68. Which of the following pipes is least corrosion resistant?
69. Points of arrest for iron correspond to
70. The charge is fed into the blast furnace through the
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