Major Differences Between Hot Rolled And Cold Rolled Steel

hot-rolled-steel
The Process of Making of Hot Roll Steel and Its Uses
August 30, 2021
Cold Rolled Steel

Steel comes in several specifications, grades, finishes, and shapes. There are various types of steel, including hot rolled flat steel bars. Steels are widely used in:

  • Infrastructure
  • Appliances
  • Wind turbines
  • Vehicles and more

The manufacturing process of steel also has an important effect on steel products. Let’s see the difference between hot-rolled and cold-rolled steel.

Hot Rolled Flat Steel Bars

Hot Rolled VS Cold Rolled Steel:

Hot rolling of the steel refers to the processing done with steel, while cold rolling of the steel refers to the processing done at room temperature. These techniques affect the overall performance. These must not be getting confused with the specifications and grades of the steel. Including carbon steel and alloy steel, the different grades of steel can be hot rolled or cold rolled.

Some types of steel are best suited for some applications. You must know which one to use, which helps you avoid over-spending on raw materials. You can also save your time and money on extra processing. Knowing the difference between hot and cold steel is important in choosing between the two.

Hot Rolled Steel:

Steel that has been roll-pressed at high temperatures is called hot rolled steel. Almost at a temperature of 1,700˚F. This is above the re-crystallization temperature for most steels. This makes the formation of steel easy and also results in products being easier to work with.

In the processing of hot rolled steel, manufacturers start with the large and rectangular length of the metal. This is called billet, which is heated and sent for preprocessing. There it is flattened into a large roll. It is then kept at a high temperature and run via a series of rollers. This achieves the finished dimensions.

White-hot strands are pushed via the rollers at high speed. For sheet metal, rolled steel spins into coils and left to cool. For other forms like plates and bars, materials are sectioned and packaged. The steel shrinks as it cools. As hot rolled steel is cooled after processing, there is less control over its final shape.

Cold Rolled Steel:

Cold-rolled steel is hot-rolled steel that has been through further processing. When the hot rolled steel is cooled, it is then re-rolled at room temperature, achieving more exact dimensions and best surface qualities.

Cold rolled steel is mostly used to describe the range of finishing processes. The cold rolled applies only to sheets that undergo compressions between rollers. Steel forms like tubes or bars are not rolled. Other cold finishing processes include:

  • Grinding
  • Turning
  • Polishing

Each of them is used to change hot rolled stock into more refined products.

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