## 1 Introduction  
Among the currently available materials, copper and copper alloys possess interesting physical and chemical properties, such as high conductivity, good strength, ductility, machinability, and durability, with good resistance to oxidation and corrosion. Adding other elements is possible in order to acquire other properties for special applications, such as aerospace, marine, automotive, and others [1, 2]. Manganese bronze alloy has some designations normative as UNS C67600, CZ115, CW722R, and CuZn40 Mn1 Pb1 FeSn provided in technical standards from copper alloys, for example, ASTM B138, DIN EN 12164-12165-12167, and BS 2872-2874. This alloy has average 60 wt.% of copper, 1 wt.% of lead, 1.5 wt.% of tin, 1.3 wt.% of iron, 0.5 wt.% of manganese, and zinc is the remainder [1; 3; 4; 5; 6; 7; 8]. These types of copper alloys are applied when the characteristics of high mechanical strength and corrosion resistance are required particularly in under seawater conditions, such as the mechanical components in marine environments, for instance, gate valve stems [9]. Stems are machined before they become gate valve stems; therefore, the addition of lead to improve the machinability level during the manufacturing process and other additional elements give the alloy special technical features; for instance, iron improves the tensile strength, tin increases the corrosion resistance, and manganese is used to obtain excellent elastic properties [9; 10]. The increase in the mechanical properties observed after the forming process is because, when metals have their geometric shapes permanently deformed, there is an increase in the density of discordance in the microstructure, which is known as hardening or cold working [11]. According to [PERSON] and [PERSON] [12], in metal alloys, plastic deformation occurs by the movement of discordances, and the hardening mechanism is to increase the mechanical resistance of metals through the obstruction of the movement of discordances. During plastic deformation, the discordances change in quantity and make interactions with each other, obtaining high reliefs and groupings that hinder the movement of discordances. To overcome them, it is necessary to use the application of stresses [11; 13]. Evaluations made by [PERSON], [PERSON], and [PERSON] [14] in a tensile test at room temperature, through high angular resolution-electron back scatter diffraction (HR-EBSD), showed clear increases in the density of the discordances in copper pure oxygen-free (10 ppm max) microstructure. This stress attribution can be observed in the engineering stress-strain or true stress-strain curves, which are generally acquired through the results generated in mechanical tests in laboratory environments to obtain predictions of the behaviors of metals in the manufacturing processes where plastic deformations occur through cold working, such as drawing, rolling, stamping, and others [15]. Cold working process is typically combined with annealing sequentially. During the deformation process, a part of the applied mechanical energy is transformed into heat, however, the remainder is stored in the metal. Therefore, during annealing, these stored energies promote the processes of recovery and recrystallization. Through these procedures, it is possible to achieve the mechanical properties desired. This study aims to establish the hardening coefficient (\(n\)) and the plastic constant (\(k\)) using the Hollomon Model and to evaluate the behavior at different temperatures correlating with the results generated in the microstructure and in the mechanical properties of manganese bronze alloy. Although the recrystallization behavior and texture evolution during annealing have been studied by many researchers in Brass and several Bronze alloy series [16; 17], there is still a gap of research to determination of temperatures ranges to achieve the mechanical and microstructure properties foreseen in technical standard ASTM B138 due to heat treatment process, according to Table 1[3].