The process which improves the machinability of steels, but lowers the hardness and tensile strength is
A. Normalising
B. Full annealing
C. Process annealing
D. Spheroidising
Answer: Option D
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Spherodizing is heat treatment process in which the steel is heated below eutectoid temperature and cooled, with the formation of spherical lumps of cementite, in a ferrite matrix.
Spherodizing improves machinability and ductility.