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Hot Rolled P&O as it is often called, is Carbon steel that has had the 'scale', that typically coats the steel after being formed, removed through the process of an acid bath. In order to prevent surface rust from forming after the process, the hot rolled steel is coated in an oil. The process of the acid bath is the 'pickling'
Hot Rolled Coil are the Coil produced from liquid/crude steel. The process for the production of HR Coil is Melting and Reforming, also known as Hot-Rolling. HR Coil are made by uninterrupted rolling of steel at a high-temperature range, generally at 538 °C – 650 °C. The process is done by passing the metal sheet through rollers at high temperature, or above the recrystallization temperature of the metal. This hot rolled steel is also passed through a solution having a pH of less than 7. The metal sheets are passed through rollers several times to achieve the required thickness of the coil. Getting a desired hot-rolled product is difficult because steel starts shrinking as it gets cooled. After getting the product, pickling is done. Pickling is the process to remove the impurities and inorganic contaminants from Hot-Rolled Coil.