What Is The Difference Between Black And Bright Steel?
Steel products are very commonly made and used, but the raw material, despite being the same metal, is used in the processed form for different purposes. Two of the common varieties of steel is black and bright, which leads to a popular question from consumers of steel asking about the differences between the two. As mentioned, the two different types of steel are based on the kind of process the steel bars go through at a manufacturer's mill. Let us dig in a bit for further clarification about it.
Black Steel
Black Steel Bars or Wires go through a rolling process in a very high temperature which is typically known to be above 1700 F. The raw material such as billet blooms go through the rolling process again and again till they get the desired shape, which is round, flat, hexagonal, etc. The temperature used for the process is above the recrystallization point of steel, which makes the deformation, shaping, and expansion of steel very easy. And although black steel bars are much cheaper, due to the process, the shape changes slightly after the steel coos down. It results in a lesser amount of both shape control and tolerance in the metal.
Uses- Welding and construction of I-beams and Railroad tracks.
Bright Steel
Bright Bars are black steel bars undergone further processing. After the heat rolling of black flat bars, key steel bars are brought down to room temperature for annealing or temper rolling. The further processing that a bright bar has to go through has mainly four main stages, cold drawing, turning, grinding, and polishing. Each of the processes add a property to the key steel bar. While cold drawing increases tensile strength, turning gives smoothness, grinding narrows shape increasing tolerance, and polishing adds aesthetics with the shine. Additionally, flat bright bar manufacturers like Matta Drawing use cold rolling to produce precise and complex shaped steel products for specific client requirements as well.
Uses- Projects that require high tolerance and precise shape, for example, Heavy Engineering, Agriculture, Food Processing industry.
Publish Date : 07-08-2020