Bright Steel round bar are produced from black bars by passing through dies in a cold condition or by turning the bars in a peeling machine and some other processes. They are used where specific tolerance are required such as for use in CNC machines, etc. Sometimes heat treatment such as annealing is done before cold finishing. There are five main types of different processes to achieve the desired sizes.
The black bars are turned to the desired sizes. This process eliminates all surface imperfections. But internal imperfections if any are exposed. This process does not increase the tensile strength of the bars
The grinding process is used to narrow the tolerances and improve the surface finishes of the above two processes
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