The sheet made of hot rolling steel, which has been subjected to pressure rolling at a temperature higher than 930 degrees Celsius (1700 degrees Fahrenheit) and as a result of this operation, its formability has been optimized, hot rolling steel sheet or Abbreviation of black sheet, it is said that the most common alloy produced in Iran are St37 and St52 sheets. Mobarake steel factories in Isfahan, Aksin steel in Ahvaz, and Kavian steel in Ahvaz are among the most famous factories that produce steel sheets.