P ickling
The surface scale (iron oxide) formed on hot coils in the hot rolling process are washed off (“pickled”) using hydrochloric acid.
Cold Rolling
Here, hot coils are rolled to a usable thickness at room temperature. Coils rolled even thinner during this process are called cold rolled coils.
Hot Rolling
Here, slabs are pulled to make steel strips. The slabs are reheated to 1250°C and rolled while hot. The rolled strip steel is then wound up like a roll of toilet paper (called a “hot coil”).
Zinc P lating
Here, iron is dipped into and coated with molten zinc. Here, iron is d
22
21
Made with FlippingBook Digital Proposal Creator