1347Mechanical EngineeringMedium
Ductile cast iron________?
Ais produced by annealing process. It is soft, tough and easily machined metal
Bis also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Ccontains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
Dnone of the above
Eis produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Correct answer
E. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Explanation
The correct answer is is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material.