The heat treatment process to which castings and the steel balls produced by cold heading are subjected is____________________?

A. Boiler plate steel
B. Rail steel
C. Saws for cutting steel
D. Railway spring steel

A. Welding
B. Slip casting
C. Extrusion
D. Plastic pressing

A. Pig iron
B. Steel
C. Ferroalloys
D. All A., B. & C.

A. Carburising
B. Nitriding
C. Cyaniding
D. Annealing

A. Injection moulded
B. Cast molded
C. Extruded
D. None of these