Austenite Grain Size of Thin Slab and Its Influence on Direct Hot Strip Rolling of Nb Microalloyed Steel

Abstract:

In the production with thin slab casting a serious problem of insufficient grain refinement and microstructural inhomogeneity has been found. In this paper attention has been paid to the austenite grain size changes in thin slab of a high strength Nb microalloyed steel under as-cast conditions and after first rolling pass. For comparison, the conventional thick slab was also investigated. It was found that although as-cast thin slab shows a smaller average austenite grain size than that of as cast thick slab; the latter after reheating shows a much finer average austenite grain size. The first rolling pass at high temperature and with heavy reduction causes rapid recrystallization that contributes to austenite grain refinement.

• Periodical: Materials Science Forum (Volumes 500-501)
• Pages: 295-302
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.500-501.295
• Online since: November 2005
• Authors: Hong Tao Zhang, Ganyun Pang, Rui Zhen Wang, Chengbin Liu
• Keywords: Austenite Grain Size, Direct Hot Rolling, Grain Refinement of Austenite, Nb Microalloyed Steel, Thin Slab

References

[1] Zhang Hongtao et al.: International Symposium on Thin Slab Casting and Rolling, CSM, China, 2002, p.282.

[2] B. Engl and K. Kaup: Thermomechanical Processing of Microalloyed Austenite, TMS, 1982, pp.467-482.

[3] J. M. Rodriguez-Ibabe et al.: International Symposium on Thin Slab Casting and Rolling, CSM, China, 2002, p.252.