Question

What is the process in steel to relieve strain and stress to eliminate hardness and improve the machineability?

1) Tempering

2) Annealing

3) Hardening

4) Normalising​

Answer 1

Sub-Critical Annealing is a relatively low temperature heat treating process used to reduce hardness and increase ductility. This process improves machinability and reduces stress, to decrease the likelihood of cracking during cold working operations.