The iron ore, coke, sinter and limestone are continuously supplied through the top of the blast furnace, while a hot blast of air is blown into the lower section of the furnace through tuyeres,the chemical reactions take place throughout the furnace as the material moves downward. The end products are usually molten metal and slag phases.
Rolling is a fabricating process in which metal is passed through a pair of rolls. Rolling has 2 main classifications,flat rolling or profile rolling. Rolling is also classified according to the recrystallization temperature of the metal, hot rolling and cold rolling.
Steel's corrosion resistance can be improved by coating, a wide range of different coatings is available, including: Zinc coating (normally called galvanizing); organic coatings, tinplate and other metals (chromium, lead, aluminum).