Modeling the Coating Iron Content as a Function of Small Changes of Processing Variable in Hotdip Galvannealed Coasting on IF Steel Sheets.

Optimization of Galvannealing Parameters through Numerical Modeling of Galvannealing Process

“…Rios and co-workers [10][11][12][13] empirically modeled the isothermal and nonisothermal kinetics of iron enrichment during the galvannealing process. They described the kinetics of iron enrichment of the zinc coating during galvannealing and obtained an empirical correlation for iron enrichment as a function of the galvannealing parameters such as the line speed, the bath aluminum content, the galvannealing temperature, the inhibition layer thickness, etc.…”

An Alternative Method to Calculate Processing Variables for the Galvannealing Process.

“…Recently, the concept of "processing window" [2][3][4][5][6] for the galvannealing process has been introduced. A processing window is essentially an area in a soaking temperature vs. line velocity plot within which the galvanealing cycle of a certain zinc coated steel sheet will result in a coating iron content between 10 and 11 mass%.…”

Determination of the Heating and Soaking Stage Length of a Galvannealing Furnace.

“…In those works it was shown how one can predict the nonisothermal kinetics of iron enrichment from the isothermal kinetics which can be fairly easily measured in the laboratory. More recently the concept of "processing window" [9][10][11][12] for the galvannealing process has been introduced. A processing window is essentially an area in a soaking temperature vs. line velocity plot within which the galvanealing cycle will result in a coating iron content between 10 and 11 mass%.…”

“…In previous works [1][2][3][4][5][6][7][8][9][10][11][12] a quantitative study was carried out to describe the isothermal kinetics of iron enrichment of the Fe-Zn coating. Furthermore, in industrial galvannealing practice, the zinc coating is subjected to a nonisothermal heating cycle.…”

“…Details can be found in those papers. [9][10][11][12] Those previous papers essentially focused on the "direct" problem, namely, for a given furnace and galvanized coating what would be the adequate processing window. However it might be of some use to study also the inverse problem.…”