Sunday, July 26, 2020

What is the difference between HR & HRPO sheet?

As the name implies, hot rolled steel is the different shapes converted from services (infants like slab, bloom, billets) after passing between rolls in the red hot condition normally at a temperature above which plastic properties are achieved and rolled shape becomes permanent, the cold-rolled sheet is the sheet (categorized as a flat product) rolled at ambient temperature under heavy roll pressure and high pulling tension at the entry side and exit side of reduction mill, this process gives a longitudinal increase of the length of input material. The hot rolled steel or HR steel is softer and has lower strength as compared to HRPO. Hot rolled steel is the most elemental form of carbon steel. However, the scale that is left behind on hot rolled steel after it is formed is undesirable in many manufacturing applications and processes. To fight the scale issue, mills started to pickle and oil their steel to create a more desirable product for end-users.

HRPO steel is now also considered as hot rolled steel even though it does not have any scale. The final product of HRPO steel is created when steel mills use acid baths to remove the scale that usually forms on the surface of the carbon steel coil, as the coil is cooling. Once the coil is bathed in acid, it is “pickled”. The vinegar process consists of suing dried oil to the steel’s surface to prevent from rusting. HRPO flat rolled steel is ideal for plate burning and plasma cutting procedure to manufacture, more precise steel components, and parts out of the HRPO sheet and plate.

Hot Rolled steel

  • Heated above recrystallization temperature.
  • Rolled between rollers.
  • Due to heated at high temperature, its forms easily. But chances of scaling is more. So, it can reduce productivity.
  • Gives more ductility and softness as compared to cold rolled steel.
  •  Pickling is required after rolling for remove scaling.
  • Surface Finnish is not smooth and shiny.
  • Consistent high quality
  • Wide product line-up
  • Wide size range and superior dimensional accuracy
  • The outstanding technical servicing system
HRPO stands for Hot Rolled Pickled & Oiled- and it is one way of removing the scale and protecting the raw steel. The pickling part of the process consists of dipping the hot rolled steel in a steaming cauldron of pickle liquor (aka hydrochloric acid) which strips away the mill scale.

HRPO steel is hot rolled steel refined with an acid solution – a technique called pickling – to pull out contaminants and other unwanted elements such as stains and rust created by exposure to oxygen on the steel’s surface. Dipping the steel into tanks of hydrochloric acid causes a
reaction that eliminates these contaminants, called scaling. After the acid is rinsed off and the steel dried, a thin film of oil is applied to prevent rusting. Pickling and oiling make the steel durable, malleable, and cleaner to paint.


  • Good Surface Finish
  • Flatness
  • Weldability
  • High Strength to Weight Ratio
  • Close Dimensional Tolerances


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