Characterization of recycled Q235 steel chips from rolling billet scales

Abstract

In the last decades, the demand for steel has increased exponentially generating tons of waste impacting the environment. The most common waste in steelmaking process are slags which are produced during the rolling process of steel billets. This situation has encouraged the scientific community in finding environmentally possible ways to take advantage of this slags. In this work, we present the structural and magnetic properties of solid state recycled Q235 steel chips obtained by powder metallurgy and extrusion process from oxide scales of billets. The characterization of the recycled Q235 chips was performed by X-ray diffraction, Mössbauer spectroscopy and magnetic measurements. The X-ray diffraction reveals α-Fe as the predominant crystallographic phase and non-stoichiometric wüstite in minor amount. The Mössbauer spectrum revealed a sextet associated to α-Fe phase with a hyperfine magnetic field B hf ~ 33 T and two doublets associated with Fe 2+ and Fe 3+ from the non-stoichiometric wüstite. Magnetic measurements show a ferromagnetic behavior because the presence of α-Fe which is the predominant phase and hysteresis is also observed under low applied fields.

Characterization and Mössbauer spectroscopy of steel slag generated in the ladle furnance in SIDERPERU steel plant

“…The information provided in the present work would be very useful for posterior attempts to recycle these types of steel slags. As a matter of fact, recently our research group has reported the reduction of the slags produced in SIDERPERU plant [5] and also our initial achievements in recycling them into Q235 steel pieces [6], for which the information provided in the present work were very useful.…”

“…The partial replacement of cement by steel slags makes a significant contribution to the steel industry and helps to reduce CO 2 emissions [2]. Thus, finding an appropriate use of steel slags is very important for both, to reduce the potential impact on the environment and to maintain the sustainability of natural resources [5,6].…”

Characterization of iron oxide waste scales obtained by rolling mill steel industry

“…If these resources are reasonably treated, then not only the environment would be protected and disposal costs reduced, but also proposing new cheap technology for producing advanced materials [3]. Some attempts in re-using waste materials from steel industry includes iron oxide pigments, new metal pieces, manufacturing equipment, chemical tankers, automotive and airplane components [4,5].…”