Nowadays, the total output of raw materials with zinc flowers on galvanized steel coils is relatively small. Can the hot-dip galvanized raw materials without zinc flowers be used to replace the hot-dip galvanized raw materials with zinc flowers?
There are two types of hot-dip galvanized steel coil zinc flower: one is all normal zinc flower, and the other is non-zinc flower. The previous hot-dip galvanized commodities are pure because the lead in the zinc solution cannot be extracted. There are always some zinc flowers on the surface layer. Therefore, the old consciousness of hot-dip galvanized rolls means that there are zinc flowers.
Along with the development trend of the automotive industry, hot dip galvanized steel coils are subject to spraying regulations. Zinc flower is harmful to spraying. After that, the lead in the zinc ingot and zinc liquid is reduced to tens of ppm. , People can make goods without zinc flower or very little zinc flower. All normal zinc flower is the zinc flower which is obtained after hot dip galvanizing under normal conditions. It is meant for general main purpose.
The key to non-zinc flower commodities refers to the unique production process, which generally controls the lead in the zinc pot to a certain level, or after the hot-rolled steel is discharged from the zinc pot, it has undergone a unique solution, such as the treatment of small zinc flowers The process or spraying zinc powder to control the zinc flower below a certain level can obtain zinc flower-free products.
The key to zinc non-ferrous metal commodities is to carry out further zinc non-ferrous metal solutions for the pure zinc commodities after the zinc pot is released. What is obtained is a zinc-free flower, dark gray, dull and dull coating.
Annealing temperature is a key processing parameter of the galvanized coil process. The annealing temperature is very harmful to the tensile strength of commodities. When the annealing temperature is low, the quenching is insufficient, the crystal is fine, the compressive strength is high, and the elongation is too high; the annealing temperature is too high and it is very easy to cause the crystal to be abnormally thick, and the tensile strength is reduced. In the process of customer stamping die forming and drawing, it is very easy to break immediately.
The roughness of the raw material of galvanized steel coils will harm its ability to store oil on the surface. The appropriate roughness of the coiled steel is also critical to the characteristics of the stamping die of the raw materials. In addition, the selection of the amount of grease is very critical. If the amount of grease is too small, the raw materials will not be fully moisturized during the entire process of stamping die, which will cause the raw material stamping die to crack; if the amount of grease is too large, the cutting and forming will be complete. The process is very easy to deviate.
