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Description: STEEL SHEET IN COILS - Metal sheets in coil form are flat products wound into rolls and having a rectangular cross-section, the width of which is much larger than the thickness. A distinction is drawn between hot- and cold-rolled sheet. Hot-rolled sheet in coil form is produced from semifinished products (slabs or billets), which are reduced to certain thicknesses by rolling and annealing and wound into a roll. Cold-rolled sheet in coil form is produced by removing rust from hot-rolled sheet by "pickling" it in a weak acid solution, then washing, brushing, drying, oiling and unrolling the sheet and finally performing cold-rolling by passing the sheet through a reducing mill under pressure and winding it into a roll. Cold-rolled steel is a more highly finished product and has a smoother surface, greater dimensional accuracy (thickness, width, length) and greater strength.
Index: 868

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