Change in Earing of Low-carbon Aluminum-killed Steel Sheets with Hot- and Cold-rolling Conditions.

Abstract

Experiments have been conducted to investigate the effect of hot-and cold-rolling conditions on earing. It was shown that the earing of cold-rolled and annealed sheets increases with an increase in cold-rolling reduction. On the other hand, the earing decreases with a finishing temperature below Ar3 temperature in hot rolling, the effect of the finishing temperature below Ar3 being minimal in connection with a hot-rolling reduction. The earing increases as the hot-rolling reduction increases and a finishing temperature below Ar3 decreases. With a lower coiling temperature, a deformed structure remains in hot-rolled band and the earing is increased. These increases or decreases in earing depend on the growth or suppression of 45°earing arising from the texture of RD//͗110͘Ϯ20°. The texture development is affected by the initial texture and initial grain size before cold-rolling, and the earing is controlled by the effect of a balance between the same.

Effect of Coiling Temperature and Cold Rolling Reduction on Planar Anisotropy of Ti-Alloyed Low Carbon Steel

“…Furthermore, improve the planar anisotropy characterized by planar anisotropy index △r can also increase the forming property [1]. The small planar anisotropy can be benefit for stable flowing and intercoordination during deformation, which makes the thickness of sheet uniform reduce and with no ear defect during punching process [2]. Ways to receive small planar anisotropy are controlled by the cold rolling reduction and micro-alloying treatment to decrease the texture intensity and obtain uniform but fine recrystallization grain [3][4].…”