HR Sheets refer to hot rolled sheets, which are flat steel sheets that have been rolled at high temperatures. The hot rolling process involves passing the steel through a series of rollers while it is heated above its recrystallization temperature, which is typically around 1,000 degrees celsius. This process results in a less precise thickness and a rougher surface finish compared to cold rolled sheets. HR Sheets are popular in the production of metal furniture, storage tanks, and machine components.