What is Hot Rolled Steel?
Hot Rolled Steel is a mill process, which can be described steel is rolled at high temperatures. This needs to be done above steel’s recrystallisation temperature, so it can be easily shaped and formed in large qualities.
History of Hot Rolled Steel
Originally, metal rolling replaced the pre-industrial metalworks and blacksmiths ‘hammer-and anvil’ approach. Early metalworkers found that forming shapes when using hammers creates objects which are far stronger than casting alone. However, the work was labour intensive, a need arose for a machine to help assist during the process. Using machines allows for the creation of metal alloy sheets with much fewer labour requirements. This has fast become the benchmark for mass production of high-quality steel for most industrial applications.
It is not known who created the first rolling mill, although one of the earliest drawings was done by Leonardo da Vinci. In the middle of the fifteenth century, it started with small mills that produced gold lace and various other decorative soft metalwork. The requirement of the metals was not to be of very high quality and certainly did not need the continued high volumes of hot rolled steel that we see today.
By the end of the seventeenth century, they developed larger iron rolls and were, therefore, able to build heavier mills. This was powered by horses, and eventually water wheels.
Todays Rolling Mills
Today’s rolling mills still have many elements of the early designs. The main difference is in the types of materials and designs. Designers have had to accommodate for processing a multiple of metals and hot rolled steel to be used in complex applications.