Study of the Acid Pickling of Low‐Alloyed Steels by Using a Descaling Workstation Simulating the Production Line

Abstract

A laboratory‐scale device was constructed for treating small‐size steel sheet specimens in an analogous manner to the acid pickling production line. This descaling simulator comprises three tanks for hydrochloric acid and another one for rinsing the samples, providing an automated sample transfer with a free selection of all processing parameters such as motion rate, residence time, temperature, etc. A detailed description of the simulator device will be given. Besides the pickling loss which was the primary parameter measured, surface roughness of the samples, Raman spectrum of the surface, and scale thickness were also determined in some cases. Scale‐related pickling loss and overpickling rate were determined for a number of steel qualities. The role of the pickling liquors of each tank was studied, and the descaling efficiency at various acid temperatures was assessed. A statistical analysis was used for estimating the fluctuation in the scale thickness on the hot‐rolled specimens. Results obtained with the descaling simulator were also checked with an optical imaging of the scale and a composition depth profile analysis. The scale thickness obtained from weight loss measurement was in good agreement with the direct scale thickness measurement.

Phase Transformation Behavior of Oxide Scale on Plain Carbon Steel Containing 0.4 wt.% Cr during Continuous Cooling

“…In the cooling stage of steel strip, the significant differences appear in the microstructure of oxide scale due to the different start cooling temperatures and cooling rates. 2,3) The different phase composition can affect the properties of oxide scale, such as tribological properties, 4) spallation and adhesion model, [5][6][7] mechanical descaling, 8,9) pickling descaling, 10,11) and gaseous reduction descaling. [12][13][14][15] Therefore, the research of phase transformation behavior of FeO in oxide scale has become a hotspot in recent years.…”

Analysis of the effect of different laser beam technology parameters when cutting stainless steel sheets with ytterbium fiber laser machine

“…If any fault occurs, nitrogen and molten steel form plasma. Plasma detection eliminates this and prevents incorrect machining of the workpiece by reducing the feed rate [14,15].…”