Study on the simulated pickling of 443NT medium chrome ferritic stainless steel

The oxide scale structure of 443NT hot-rolled strips was analyzed.The pickling of 443NT stainless steel was simulated via the 6σexperimental design.The results indicate that parabolic relations exist between the pickling scores and some of the pickling influencing factors,such as the nitric acid density,the hydrofluoric acid density and the pickling temperature.Effective pickling of 443NT can be achieved by controlling the pickling processing parameters with the HNO₃ density ranging from 80 g/L to 180 g/L,the HF density from 20 g/L to 40 g/L and the pickling temperature from 45℃to 60℃.