On the Hardness of the Low Carbon Steel Sheet after Continuous Annealing

Abstract

The effects of the hot rolling condition, soaking temperature and line speed on the hardness of the low carbon steel sheet after continuous annealing and electrolytic tinning were studied, and the relations between these processing conditions and the grain size, the carbide distribution and the approximate dissolved carbon content measured by the electric resistivity method were discussed. It was made clear that the uniformity in hardness obtained in the continuously annealed low carbon steel was mainly due to the mutual cancellation between the effects of grain size and of dissolved carbon content.
It was concluded that the line speed was an effective factor for the hardness control.