Abstract
Soft temper tinplate produced by continuous annealing from low carbon Alkilled steel would be sometimes faced with fluting trouble due to strain aging by solute carbon in product sheets. Temper rolling of high reduction could improve fluting resistance of tinplate, but would work-harden it too much for soft temper tinplate. In this work, the effect of temper rolling and overaging on the balance between hardness and fluting resistance of products was investigated.
It was experimentally shown that the softness of temper T-3 in product and the acceptable fluting resistance after baking could be compatible in the continuous annealed sheets, the carbon content in solution in which sheets was decreased enough by long time (120s) overaging, by using high reduction temper rolling.
This is because tinplate with long time (120s) overaging includes half amount of solute carbon, of that with short time (60s) overaging, after overaging to show short yield elongation after baking. It is considered that all amount of solute carbon in the annealed sheet contributes to the pinning of dislocations after baking, and that it has formed precipitates on dislocations, not atmosphere any longer.
