bzn15-24-1.5. Zinc cupronickel is a metal material. bzn15-24-1.5. When the temperature of zinc white copper rises to the specified temperature, keep the furnace temperature, and the material temperature continues to rise 20 30 after that, and then drop to the constant temperature. The length of annealing time can be flexibly grasped according to the measurement data of furnace temperature and material temperature, and combined with the observation of fire color and material color. BZN15-24-15. The zinc white copper strip is evenly burned through. Prevent the coil from being too tight between the layers, and the annealing time is short, resulting in uneven annealing. When annealing, it should be noted that the temperature control accuracy is 10 After being hoisted into the cooling pit, the ammonia cooling time is not less than 8h, and it is covered with copper foil. 
Material Name: Zinc Cupronickel Drawn Bar (Extra Hard, 5 18mm) Grade: BZN15-24-15bzn15-24-1.5. Characteristics and scope of application: BZN15-24-15 is a zinc-copper structural alloy with lead, the performance is similar to BZN15-20, but its machinability is good, and it can only be pressed in the cold state. Certain substructures and properties are altered, making the cold worked BZN15-24-15. Under the condition of basically maintaining the work hardening state, the zinc white copper strip can reduce its internal stress (mainly the first type of internal stress), reduce the wing bending and deformation of the workpiece, reduce the resistivity, improve the corrosion resistance of the material, and improve its plasticity and toughness, and improve the safety of the workpiece when used. 
bzn15-24-1.5 chemical composition: copper cu: 580～60.0 nickel + cobalt nico: 125～15.5 Zinc Zn: Residual Lead Pb: 14～1.7Pp: 002 Fe: 025 manganese mn: 005～0.5 sulfur s : 0005 Note: 075 (impurities) re-annealing According to the recovery mechanism of unevenly deformed metals, the unevenly deformed metals are heated at low temperatures, and the heating temperature is lower than the initial temperature of recrystallization. Leave on for a while and then cool slowly. In the process of heating and heat preservation, the kinetic energy of the atom movement increases, so as to increase its thermal vibration, so that the atom returns to a stable position, such as the point defect sinks into the well (grain boundary, dislocation, etc.), or the point defect cancels or combines with each other, so that the density of the point defect is reduced. bzn15-24-1.5 Mechanical Properties: Tensile Strength b (MPa): 590Elongation δ5 (%3 Note: Longitudinal tensile mechanical properties of bars at room temperature Specimen size: diameter or opposite side distance 5 18
At the same time, the dislocations also move, such as the rearrangement of dislocations, the mutual cancellation between dislocations, and the dislocation climbing. Amorphous growth, mutual merger and multilateralization of subcrystals, etc. Cold-worked metal parts are basically kept in the state of work hardening: the residual stress of the first type of macroscopic level is eliminated;Eliminates most of the residual stresses of the second type of microscopic stage;At the same time, the residual stress at the atomic level of the third type is weakened.