Producing A615 / A615M High Strength Construction Re-Bars Without Use of Microalloys: Part 2

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Ignatius C. Okafor, Kaushal R. Prayakarao & Heshmat A. Aglan (2015). Producing A615 / A615M High Strength Construction Re-Bars Without Use of Microalloys: Part 2. Mechanics, Materials Science & Engineering, Vol 1, pp. 11-27, doi:10.13140/RG.2.1.2749.2887

Authors: Ignatius C. Okafor, Kaushal R. Prayakarao, Heshmat A. Aglan

ABSTRACT. The metallurgy of ASTM A615/A615M Gr. 60 steels made from three different chemistries was studied to suggest an economically advantageous route to produce a steel grade that saves the extra cost of alloying elements. Metallographic examinations, along with microhardness and XRD studies, were performed to rate the steel chemistries based on their superheats. This study of the steel grades revealed that producing steel for requisite standards like ASTM 615/A615M Grade 60 may not be dependent on starting superheat but on the chemistry and rolling process. Study of the three chemistries A, B and C indicated that the standards were met in all 3 chemistries; however, sample A had the lowest cost chemistry and therefore is a suggested route for this product.

Keywords: A615 high strength steel, re-bar steel (grade 60), rolling process, superheat, metallurgy, grain refinement, microalloys, economical steel.

DOI 10.13140/RG.2.1.2749.2887

References

[1] Pickering, F.B., 1967, The structures and properties of bainite in steels. Paper presented at the Symposium: A transformation and hardenability of steels, February 27-28th in Ann Arbor, MI. pp. 109-132.

[2] deBoer, H., Datta, S.R., Kaiser, H.J., Lundgren, S.O., Müsgen, B., Schmedders, H., Wick, K., 1995, Naturharte bainitische Schienen mit hoher Zugfestigkeit, in: Stahl and Eisen 115, 93ff.

[3] Mesplont, C., 2002, Phase Transformations and microstructure-mechanical properties relations in Complex Phase high strength steels. Doctoral Thesis, Ingénieur Ecole Universitaire Des Ingénieurs de Lille DEA Science des MatériauxUniversité de Lille, Universiteit Gent.

[4] Maynier, P., Dollet, J., Bastien, P., 1978, Hardenability Concepts with Applications to Steels, D.V. Doane and J.S. Kirkaldy, eds., AIME, New York, NY, p.518.

[5] Donnay B., Herman J.C., Leroy V., Lotter U., Grossterlinden R., Pircher H., 1996, Microstructure evolution of c-mn steels in the hot deformation process: the STRIPCAM model, Proc. Modelling of Metal Rolling Processes Conf., eds. J.H.Beynon, P. Ingham, H. Teichert, K. Waterson, London, pp. 23–35

[6] Lagneborg, R., Siwecki, T., Zajac, S., Hutchinson, B., 1999, The Role of Vanadium in Microalloyed Steels, The Scandinavian Journal of Metallurgy, October, Vol 28, No 5, pp. 186-241.

 [7] Andrade, H.L., Akben, M.G., Jonas, J.J., 1983, Effect of Molybdenum, Niobium and Vanadium on Static Recovery and Recrystallization and on Solute Strengthening in Microalloyed Steels, Metallurgical Transactions A, Vol. 14 A, pp. 1967 – 1977. 

[8] Akben, M.G., Weiss, I., and Jonas, J.J., 1981, Dynamic Precipitation and Solute Hardening in AV Microalloyed Steel and two Nb Steels Containing High Levels of Mn, Acta Metallurgica, vol. 29, pp. 111-121.

[9] Klinkenberg, C. Niobium in Microalloyed Structural and Engineering Steel (Niobium Products Company GmbH, Steinstrasse 28, D-40210 Dϋsseldorf, Germany) http://www.metal.citic.com/iwcm/UserFiles/img/cd/2005-HSLA-NB/HSLA-045.pdf (accessed September 14th 2015)

[10] Ouchi, C., Sampei, T., and Kozasu, I., 1982, The effect of hot rolling condition and chemical composition on the onset temperature of γ/α transformation after hot rolling, Transactions of the Iron and Steel Institute of Japan, 22, pp. 214–222.

[11] Llopis, A.M., 1975, Effect of Alloying Elements in Steels on the Kinetics of the Austenite to Bainite transformation, (DOE Technical Report, DOI 10.2172/7283325, California University.

[12] Stallybrass, C., Konrad, J., and Meuser, H., 2015, The Effect of Low Levels of Molybdenum in High Strength  Linepipe Steels, Fundamentals and Applications of Mo and Nb Alloying in High Performance Steels, Vol.  2, HardyMohrbacher (Ed.), NiobelCon, Belgium, pp. 125 – 140.

[13] Quality Department, Nucor Steel Marion, Private Communication.

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