Annealing Stainless Fuel Line

[MYBAD79]

I just flared 3/8" stainless tubing tonight .... made one mistake: used a tubing cutter ..... it's called "work hardening" and the material cannot be flared unless you use some $$$$ tool....
I cut 1" off the tubing using a hacksaw, filed the tubing end clean, deburred and it flared easy .....