hot coiling technique.

I am planning to set up a hot coiling plant. Currently I am engaged in cold coiling.

What type of machinery is required for coiling?

I also want to know the type of material used for making automotive springs. I have signed a deal with an automotive company for manufacturing hot coiled springs of wire 16mm mean dia=50mm and number of coils =8. The material specified by them is EN-47 50Cr4V2.

Please provide me all the necessary information required to make this spring.

I need help on the following topics:
oil quenching
hardening
shot peening.

This is an urgent matter.