Per: HENRIQUE SEVERIANO DE JESUS (ARCELORMITTAL BRASIL SA), Fernando Generoso Neiva Ferreira (aRCELORMITTAL TUBARÃO), Eduardo Alves Machado (arcELORMITTAL TUBARÃO), Fabiano Almir Barbosa (aRCELORMITTAL TUBARÃO), Juliano Braz Possati (ARCELORMITTAL TUBARÃO), MARCELO Urdapilleta Rodrigues (ARCELORMITTAL TUBARÃO), Maurício Franco Bomfim (waelzholz bRASMETAL LAMINAÇÃO), Marina de Lima Barroso (WAELZHOLZ BRasmetal laminação), Daniel Augusto Ferro (WAELZHOLZ brasmetal laminação), Thomas Frank (WAELZHOLZ brasmetal laminação)
Abstract:
New alternative steels are continually frequently being proposed to reduce costs and improve industry competitiveness. This study presents the development of high-carbon low-alloy steel, BW BL 50CrMo4, at ArcelorMittal Tubarão and Waelzholz Brasmetal Laminação, as a re-rolled product to meet the demands of the chainsaw bar and tool market, providing a ready-to-use product and reducing the final customer's heat treatment steps. The production of this type of steel requires rigorous process control from the steel mill to the re-rolling. This steel is widely used in components that require high mechanical strength, cleanliness, shape maintenance, and abrasion resistance. This study investigated, on an industrial scale, the process parameters, and critical characteristics for developing a high-carbon steel sheet with Cr and Mo alloy for chainsaw guidebar. The steel was characterized throughout the entire process (casting, hot rolling, cold rolling + batch annealing, and heat treatment) using tensile testing, hardness testing, optical microscopy (OM), and scanning electron microscopy (SEM). The results showed the evolution of the material's microstructure, from a ferrite/pearlite microstructure on the hot band, spheroidized in cold rolling + annealing, to a fully bainitic microstructure after austempering, ready for the manufacture of chainsaw bars.
