Characteristics of Brass Strip Production Method

Characteristics of brass strip production method:
1. Cold rolling of brass strip
(1) Plastic deformation.
(2) The pressure in the roll gap area is high, and there is a pressure distribution, * *, up to 2700mpa.
(3) At the same time, there is friction along the rolling direction and the opposite rolling direction.
(4) The instantaneous temperature of roll gap is high, up to 200 ~ 300 ℃.
(5) Rolling and sliding coexist.
2. Hot rolling of brass strip
Advantages of brass strip hot rolling
(1) Hot rolling can significantly reduce energy consumption and cost. During hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduces the hot rolling energy consumption of metal deformation.
(2) Hot rolling can improve the processing properties of metals and alloys, that is, the coarse grains in the casting state are broken, the cracks are obviously healed, the casting defects are reduced or eliminated, the as cast structure is transformed into deformed structure, and the processing properties of alloys are improved.
(3) Hot rolling usually adopts large ingot and large reduction rolling, which not only improves production efficiency, but also creates conditions for improving rolling speed and realizing continuous and automatic rolling process.

Characteristics of Brass Strip

Disadvantages of brass strip hot rolling:
(1) After hot rolling, the non-metallic inclusions (mainly sulfides and oxides, and silicates) inside the metal are pressed into thin sheets, resulting in delamination (sandwich) phenomenon. Delamination can deteriorate the tensile properties of the metal along the thickness direction, and interlaminar tearing may occur when the weld shrinks. The local strain induced by weld shrinkage is often several times of that at yield point, which is much larger than that caused by load.
(2) Residual stress caused by uneven cooling. The residual stress is the internal self balance stress without external force. All kinds of hot-rolled section steel have this kind of residual stress. The larger the section size of general section steel is, the larger the residual stress is. Although the residual stress is self-equilibrium, it has a certain influence on the properties of metal under external force. Such as deformation, stability, anti fatigue and other aspects may have adverse effects.
(3) The mechanical properties of hot-rolled products can not be controlled accurately, and the microstructure and properties of hot-rolled products can not be uniform. Its strength index is lower than that of cold work hardening products, but higher than that of fully annealed products; its plasticity index is higher than that of cold work hardening products, but lower than that of fully annealed products.
(4) The thickness of hot-rolled products is difficult to control, and the control accuracy is relatively poor; the surface of hot-rolled products is rougher than that of cold-rolled products, and the Ra value is generally 0.5 ~ 1.5 μ M. Therefore, hot rolled products are usually used as cold rolled billets.