Analysis of Galvanized Steel Sheets Fabrication in Cold Rolling Shop and Identification of Local Impacts Contributing to Corrosion of Metal-Products

Abstract

An urgent need has been identified, associated with the validity of improving the process for the manufacturing of galvanized steel, in the analysis and improvement of each stage of production in the conditions of the particular cold-rolled shop of the Iron and Steel Work. As a novelty, the processes and equipment for cleaning a hot-rolled strip, pickling a strip, rolling of pickled strips, physicochemical surface treatment, zinc coating, passivation, and other elements were reviewed from the point of view of possible corrosion consequences of the production. For the first time in the considered production system, elements and operations, their errors and imperfections, which can lead to poor-quality coating, violation of the zinc layer and reasons that contribute to the corrosion of galvanized metal products in the future, were identified at each stage.

Causes and Prevention Measures of Bright Pitting Defects on Surface of Hot-Rolled Galvalume Steel Sheets

“…Based on the characteristics of the equipment in this steel enterprise, the main production flow of the hot-rolled galvalume products was arranged as: hot rolling of steel coils → acid pickling → degreasing and cleaning → continuous annealing → hot dipping of aluminized zinc → post-plating treatment → coiling [21]. In this flow, strip steel was subjected to multi-stage cleaning, including alkaline cleaning, brushing, electrolytic cleaning, and hot water rinsing; the annealing furnace adopted in the experiment is a large vertical-style zinc kettle with advanced international technologies (Model AJAX MAGNETHERMIC), the zinc kettle is a movable inductive dual-kettle system equipped with advanced vertical-style roll coater and inductive curing oven, which can be used to produce high quality fingerprint-resistant sheets and selflubricating sheets.…”

Process Study and Application of Hot-rolled Aluminum-Zinc Plating Steel Plate Unit

“…Due to the long production line and complicated process of hot-dip aluminum-zinc plating unit, it is difficult to control the overall quality of strip steel surface. At present, researches on aluminum-zinc plating process mainly focus on cold-rolled steel plates [1][2][3][4][5], while there are few researches on direct hot-dip aluminum-zinc plating on hot-rolled steel plates. Thus, it is necessary to study production process parameter control in each stage of hotrolled aluminum-zinc plating.…”

Визначення Впливу Геометрії Штрипса, Режимів Стикового Зварювання Та Валкового Формування На Міцність Зварного Шву Холодногнутих Коритних Профілів

“…При виробництві гнутих профілів відкритого перерізу, які застосовують, наприклад, у металопластикових віконних системах різних брендів [1], поширене використання стикового зварювання [2]. Вихідною заготовкою для гнутих профілів є листова оцинкована сталь марок типу Ст.0-Ст.3, 08пс тощо товщиною від 0,65 до 2,0 мм, яку виробляють у вигляді рулонів на станах холодної прокатки з нанесенням цинкового покриття [3,4]. Рулони розрізають подовжньо на штрипси.…”