Rolled Steel which includes bar, rod and structural steels is produced by rolling the steel into shape. There are two types of rolled steel

1) Hot-rolled steels (Hr Sheets)

2) Cold-rolled steels (Cr Sheets)

Hot-rolled steels are formed into shape while the metal is red-hot. The metal passes through a series of rollers, each a little closer to the next one. As the steel passes through the last rollers, hot water is sprayed over it, forming a bluish scale. The steel produced by this method is fairly uniform in quality and is used for many different kinds of parts. Hot rolled bars of best quality are used to produce cold-finished steels.

Cold finished or cold-rolled steels are used when great accuracy, better surface finish, and certain mechanical properties are needed. After removing the scales from the hot-rolled bars, one of two techniques are employed.

1) the bars may be cold-drawn i.e. drawn through dies a few thousandth smaller than the original bar.

2) according to a very similar method, the steel may be cold-rolled i.e. the rolled cold to the exact size.