Difference between Hot Rolled & Cold Rolled Steel Round Bars

Hot Rolled Steel Round Bars

Hot rolled steel round bars are simpler to form, shape and form. It has its origin in the mill process involving rolling the steel at high temperatures. It starts with being heated at 926° Celsius then the steel is rolled through the press into the desired shape. The whole process is done at very hot temperatures and at the end cooled down. The cooling down may cause the steel to shrink, so there’s less control over the final size and shape. Hot rolled steel is typically used when precise shapes and tolerances aren’t essential.


  • Cheaper than cold rolled steel round bars
  • Hot rolled steel round bars are allowed to relax down at normal temperature and made free from internal stresses which can arise from hardening processes


  • Dimensional uncertainties are caused due to heating and cooling down
  • The rough texture on a surface has to be removed and buffed before painting
  • Slight distortions

Cold Rolled Steel Round Bars

Cold-rolled steel round bars are heated and cooled to normal temperature, then rolled again. The steel is then processed further in a cold reduction press, where the metal is cooled again followed by forming material by cold rolling to achieve the required shape.


  • Accurate shape (consistent and straight)
  • A wider range of surface finishes
  • A smooth and shinier surface
  • Bars have well-defined edges and corners


  • More expensive than hot rolled steel round bars
  • Fewer shapes are available in the cold-rolled round bars variety
  • More prone to warping due to internal stress on the inside

How to differentiate them?

Hot rolled steel round bars come with scales, rounded edges and their surface is non-greasy. Whereas, Cold rolled steel round bars have a greasy finish, a smooth-to-touch surface, and precise sharp edges.

Piyush Steel Round Bars is a very reputed exporter of Round Bars of various materials, sizes and specifications.

Read more about Stainless Steel Round Bars – Applications and Uses

Stainless Steel Round Bars – Applications and Uses

Wondering what are Stainless Steel Round Bars – Applications and Uses?

It is precisely said that stainless-steel bars are one of the core elements of any manufacturing industry or any business that depends on machinery.

On account of their versatile applications, stainless-steel bars are utilized in a wide range of industries like ship-building, automobile, textiles, paper, fabrication, cement, heavy earth moving equipment and construction. Stainless Steel bars usually come in shapes like flat, round, hexagonal, and square. For the most part, it’s the structure of the bar that defines its application space. Steel bars applications and utilizations rely on the type of bars required and are available in several sizes also.

Flat bars:

Stainless steel flat bars are hot-rolled, thick, high-strength, and highly corrosion resistant in nature. They are used in applications where the steel isn’t exposed to natural elements like lifts, escalators, and underground stations. Some uses of stainless-steel flat bars are in areas like ornaments, bracing, brackets, base-plates.

Round bars:

SS round bars may be a standout amongst all the essential players within the machining industry. Stainless steel round bars are often cut and machined into tools easily. This is why round bars are preferred, to make machine parts and automobile components. On the account of the highly-valued property of corrosion resistance, Stainless Steel round bars are utilized within the assembly of machining, fasteners, grills.

Hexagonal bars:

Hexagon bars application is more general-purpose. Their end-use is in construction industries. They are designed to carry weight.

Square bars:

Square bars are known for his or her hardness, strength, and immense wear resistance. These are mostly wont to manufacture medium to large-sized components for industrial equipment. These are again from one among the favoured categories that enjoy wide application within the manufacturing industry about machinery and fasteners.

Last, but not least, certification by the standard control department plays a critical part in determining its role within the manufacturing industry. Composition analysis, internal defects tests and Ultrasonic tests, surface, lastingness, and other mechanical and chemical properties tests are constantly done to substantiate the bars’ value and build up their suitability for the intended end-use.

Also, read Applications of Copper Nickel at findexcellent.com/copper-nickel-applications/