Abstract
A continuous demand for thick plates for structural applications with yield strength of 450–485 MPa, high toughness and cold resistance requires the development of new methods of additional grain refinement at all stages of thermo-mechanical control process (TMCP). The effect of Ti-Nb precipitates morphology on grain growth during reheating was investigated. It has been shown that Nb is a key element for grain growth control. Submicron Nb carbonitrides suppress austenite grain growth at lower slab reheating temperatures. The effect of Ti additions on suppression of grain growth during low-temperature reheating is negligible. Parameters of reheating such as duration and temperature were adjusted in order to maximize the effect of Nb microalloying and to receive finer austenite grain before hot rolling. Grain refinement in the course of hot deformation was studied through physical modeling. Using the recrystallization model, new rolling schedules were introduced. Industrial trials were conducted; the effect of reheating and deformation parameters on cold resistance of steel was investigated. Implementation of the results of given study into production practice made it possible to produce plates with excellent set of properties, including strength, toughness, and cold resistance.
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Tamura, C. Ouchi, T. Tanaka, H. Seikine, “Thermomechanical Processing of High Strength Low Alloy Steels”, Ed. Butterworths, London, 1988.
A.J. DeArdo, “The Physical Metallurgy of Thermomechanical Processing of Microalloyed Steels”, Thermec’97, TMS publications, USA, 1997, pp. 13–30.
P.A. Manohar, M. Ferry and T. Chandra, “Five decades of Zener Equation”, ISIJ International, 1998, Vol. 38, No. 9, pp. 913–924.
L.J. Cuddy and J.C. Raley, “Austenite Grain Coarsening in Microalloyed Steels”, Metallurgical Transactions A, 1983, vol. 14 A, pp. 1989–1993.
Yoshie, A.; Fujioka, M.; Watanabe, Y.; Nishioka, K.; Morikawa, H.; “Modeling of Microstructural Evolution and Mechanical Properties of Steel Plates, Produced by Thermo-Mechanical Control Process, ISIJ Int. 1992, Vol. 32, No. 3, pp. 395–404.
Ringinen D.A.; Chastukhin A.V.; Khadeev G.E.; Efron L.I.; Il’inskiy V.I., “Evolution of Austenite Grain Structure and Microalloying Element Precipitation During Reheating of Steel of Strength Class K65 (X80) for Rolling”, Metallurgist, Vol. 57, Nos. 11–12, March, 2014.
C. Wang, M. Wang, J. Shi, W. Hui, and H. Dong, “Effect of Microstructure Refinement on the Strength and Toughness of Low Alloy Martensitic Steel”, J. Mater. Sci. Technol., Vol.23, No. 5, 2007.
S.V. Subramanian and G.C. Weatherly, “Precipitate Evolution in Ti-Nb and Ti-V Microalloyed Steels”, Thermec’97 (Wollongong), TMS publications, USA, 1997, pp. 827–835.
R. Wang, C.I. Garcia, M. Hua, K. Cho, H. Zhang, A.J. DeArdo. “Microstructure and Precipitation Behavior of Nb, Ti Complex Microalloyed Steel Produced by Compact Strip Processing”, ISIJ International, 2006, Vol. 46, No. 9, pp. 1345–1353.
Matrosov M.Yu., Efron L.I., Nemtinov A.A., Tomin A.A., Golovin S.V., Zaitsev A.S.; Shishov A.A., Stepanov P.P.; “Manufacture of Rolled Products for 762-mm-Diameter Cold-Resistant Conductor Pipe Having a Wall Thickness of 38,1 mm and an X56 Strength Rating; Analysis of the Tube Conversion for This Product”), Metallurgist, Vol. 51. Nos. 5–6, 2007.
Golovin S.V., Il’insky V.I., Tkachuk M.A., Ringinen D.A., Chervonny A.V., Slyunyayev S.M., Matrosov M.Yu., Osvoyeniye teknologii proizvodstva lista dlya proekta Yuzhnyy Potok na stane 5000 OAO VMZ (“Mastering the plate production for South Stream linepipe applications at the 5-m hot rolling mill of Vyksa Steel Works”. Proceedings of the International Tube and Pipe Conference “TRUBY-2014”, Chelyabinsk, 15–18 September 2014 (in Russian).
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Matrosov, M.Y. et al. (2016). Development of Technological Methods of Additional Grain Refinement for Production of Cold Resistant Nb-Bearing Plate Steel with SMYS 450–485 MPa and Thickness up to 40 Mm. In: HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48767-0_139
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DOI: https://doi.org/10.1007/978-3-319-48767-0_139
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48614-7
Online ISBN: 978-3-319-48767-0
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