Danieli do Brasil Service Team will provide and install a new surface Quenching and self-Tempering system for Bars-QTB at Gerdau Araçariguama, which will replace the existing bar treatment line.
The main purpose of installing a Danieli QTB process is to improve the mechanical properties of deformed bars (rebars), made from basic chemical composition, at low production costs.

For steel grades presenting yield strength equal to or higher than 500 MPa it is possible to save up to 18% of the bar production cost as compared to low-alloy steel grades.
Bars processed with the QTB system achieve international standards (ASTM, DIN, BS, ABNT) without the need of any downstream cold-working practice.
Furthermore, a very low content of alloying elements along with a better homogeneity of the mechanical properties lead to good values of ductility and elongation, improving bar weldability.
By using Danieli QTB, a lower quantity of scale on the treated bar is also produced.
The new QTB system provided by Danieli will include tools for quick replacement, aligning, and setup of cooling elements, including boxes equipped with beams. This will drastically reduce changing times and increase operational safety.

QTB startup is planned by second half 2022.