How does the 'Spring Temper' of flat wire affect the coiling of spiral rings?

Spiral rings are coiled from wire that is already in a 'spring temper' or 'hard drawn' state. This means the material already possesses its high tensile strength before the coiling process. The coiling machine must exert enough force to plastically deform the wire into a circle, while accounting for 'springback', where the ring diameter increases slightly after being released from the coiling mandrel. This cold-working process further increases the yield strength on the outer fiber of the ring, but if the wire is too hard, it can develop micro-cracks on the inner diameter during coiling, leading to failure during installation.