Abstract
The flow stress under typical hot coiling conditions has been quantified for low C and Nb-Ti (V) microalloyed steels. The equation is intended for calculating the amount of bending torque required during coiling, particularly for thick, microalloyed skelp, so as to optimally adjust the coiler tension settings. Simplified rolling, runout table (ROT), and coiling simulations, typical for 10mm strip were performed. A small plastic strain was applied during the coiling stage to study flow behaviour in the ferrite and two-phase regions. The flow stress equation developed is applicable for the following chemistry limits: 0–0.09%Nb, 0.25–1.59%Mn, 0.06–0.16%C, 0–0.25%Si, 0–0.02%Ti and 0–0.07%V. Dilatometry measurements showed that, at high coiling temperatures, a significant fraction of untransformed austenite was often present during coiling. The most significant variables contributing to flow stress in the coiling region in decreasing order are: strain, Nb content, temperature and Mn content.
Access provided by Autonomous University of Puebla. Download to read the full chapter text
Chapter PDF
Similar content being viewed by others
References
T. Motumura et al., “Coiler control in endless hot strip rolling,” IFAC World Congress, 16(1) (2005), 1687–1692.
Ju. Razinkov et al., “Innovations for coiling of modern hot rolled flat materials,” Metallurgical and Mining Industry, 3 (7) (2011), 32–38.
Y-J. Choi and M-N. Lee, “A downcoiler simulator for high performance coiling in hot strip mill lines,” Int. J. of Precision Engineering and Manufacturing, 10 (2) (2009), 52–61.
F. Siciliano, Jr., and J. Jonas, “Mathematical modeling of the hot strip rolling of microalloyed Nb, multiply alloyed Cr-Mo, and plain C-Mn steels,” Metallurgical and Materials Transactions A, 31 (A) (2000), 511–530.
F. Siciliano, Jr. et al., “Mathematical modeling of the mean flow stress, fractional softening and grain size during hot strip rolling of C-Mn steels,” ISIJ Int., 36 (12) (1996), 1500–1506.
Y. Saito, “Mathematical model of hot deformation resistance in austenite-ferrite two phase region,” Trans. ISIJ, 27 (1987), 419–424.
C. Huang et al., “Flow stress modeling and warm rolling simulation behaviour of two Ti-Nb interstitial-free steels in the ferrite region,” Acta Mater. 49 (2001), 1445–1452.
G. Xu et al., “Deformation behaviour of ultra-low carbon steel in ferrite region during warm processing,” Journal of Wuhan of Technology-Mater. Sci. Ed,. 23 (1) (2008), 29–32
H. Großheim, K. Schoten, and W. Bleck, “Physical simulation of hot rolling in the ferrite range of steels,” Journal of Materials Processing Technology, 60 (1996), 609–614.
F.A. Burgmann et al., “The effect of niobium additions on ferrite formation in Castrip® steel,” Materials Forum, 32 (2008), 9–12.
K-E. Thelning, Steel and its heat treatment, 2nd ed. (London: Butterworth & Co, 1984), 95.
R. Song, D. Ponge, and D. Raabe, “Influence of Mn content on microstructure and mechanical properties of ultrafine grained C-Mn Steels,” ISIJ Int., 45 (11) (2005), 1721–1726.
K. Banks and R. Maubane, “The influence of Mn on microstructure evolution in low c-high Nb-Ti steels subjected to limited roughing strain” (Paper presented at Metal 2014 Conference, Brno, Czech Republic, 21–23 May 2014).
Author information
Authors and Affiliations
Rights and permissions
Copyright information
© 2016 TMS
About this paper
Cite this paper
Maubane, R., Banks, K.M., Tuling, A.S. (2016). Hot Strength during Coiling of Low C and Nb-Microalloyed Steels. In: HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48767-0_35
Download citation
DOI: https://doi.org/10.1007/978-3-319-48767-0_35
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48614-7
Online ISBN: 978-3-319-48767-0
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)