Processing and Evaluation of Ferritic-Bainitic Multi-phase Steel | ||
| Journal of Petroleum and Mining Engineering | ||
| Article 10, Volume 19, Issue 1 - Serial Number 102, 2017, Pages 71-80 PDF (1.93 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpme.2017.39126 | ||
| Authors | ||
| Mohamed Safa1; Rashad Ramadan2; Samir Ibrahim2 | ||
| 1EzzAldekhela (EZDK) Steel Company, Alexandria, Egypt | ||
| 2Department of Metallurgy and Materials Engineering, Faculty of Petroleum and Mining Engineering, Suez University | ||
| Abstract | ||
| Production of bainite-ferrite multi-phase steels on industrial CSP scale provides approach to improve mechanical properties along with large cost reduction opportunity. In terms of hot-rolling conditions, chemical composition, and microstructure; characterizing ferritic-bainitic steels and their difference from ferritic-pearlitic steels regarding properties and cost becomes of a great importance to understand the optimum conditions for production. This work is aiming to improve mechanical properties of steels by producing bainite-ferrite steel through industrial scale runs on the 6 stands hot strip mill (HSM) with at EZDK steel using low alloy Al-killed steel. The effect of hot rolling coiling temperature and alloy content on final properties was studied. In addition to characterizing differences between ferrite-bainite steels and conventional ferrite-pearlite steels. Ferrite-bainite steel has been successfully produced in different conditions, showing up to 27% (~100 MPa) improvement in yield strength, 8% (42 MPa) in tensile strength, 13% in total elongation, and 11% (27 J) in impact toughness. Vanadium microalloying has proven to have almost no effect on mechanical properties of ferrite-bainite steels upon its rising from 0.045% to 0.063% which is not the case in ferrite-pearlite steels. Ferrite-bainite steel offers a great margin for alloy cost saving compared to ultra-low carbon microalloyed steels (up to 56%) through replacing chemical strengthening with phase transformation strengthening. We expect this new approach to significantly reduce the cost of production without sacrificing the quality. | ||
| Keywords | ||
| Bainite; Multi-phase steel; CSP; HSM; Microalloying | ||
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