How Does difference between hr coil and cr coil Work?

Steel is available in many grades, shapes, and finishes, with the World Steel Association listing over 3,500 different steel grades, each with distinctive properties. All those various types mean that steel has seemingly endless applications in industries as diverse as automotive, military, construction, and manufacturing.

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Changing steel&#;s chemical composition is one way to optimize it for specific applications, but it&#;s not the only way. Steel&#;s manufacturing process also significantly affects steel products, even though the specifications and grades might be similar or alike. One essential variance among steel products is the difference between hot-rolled and cold-rolled steel.

What is Rolling?

The metal forming process known as rolling uses a series of rollers to modify the shape, enhance uniformity, or improve the material&#;s mechanical properties. Rolled steel is classified into hot rolled steel and cold rolled steel, each with distinct characteristics making them appropriate for different applications.

The difference between hot rolled vs. cold rolled steel relates to the processing methods at the mill. For example, hot rolled steel involves rolling the steel at high temperatures. In contrast, cold rolled steel is processed in cold reduction mills where the material is cooled, followed by annealing to remove internal stresses or temper rolling to improve its tensile properties.

How is Hot Rolled Alloy Steel Processed?

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Hot rolled steel is roll-pressed at over 1,700 degrees F, making it easier to form and leading to products that are easier to work with.

Manufacturers start the process with a large, rectangular metal piece called a billet. The billet is heated and sent for pre-processing, which entails flattening it, keeping it at a high temperature, and running it through a series of rollers for its finished dimensions. The extremely hot steel strands are pushed through the rollers at high speeds. The rolled steel is spun into a hot roll coil (HRCS steel) for hot rolled sheet steel and left to cool. For bars and plates, the materials are sectioned and packaged.

Because hot rolled steel is cooled and shrinks after processing, there is less control over its final shape, meaning it isn&#;t as suitable for precision applications. Instead, HRS steel is more likely to be used in applications where precise dimensions aren&#;t critical. Construction projects typically use HRS material.

Hot rolling, the process used to make hot rolled steel, involves rolling steel at high temperatures (typically over ˚F). These high temperatures are above steel&#;s recrystallization temperature, allowing the steel to be easily shaped, formed, and made in larger sizes. As it cools, hot rolled steel tends to shrink non-uniformly, giving less control on the size and shape of the finished product when compared to cold rolled steel.

Characteristics of Hot Rolled Steel

Hot rolled steel tends to have a scaly finish which can be removed by pickling, grinding, or sand-blasting. This steel is essentially normalized, meaning free from internal stresses that can arise from quenching or work-hardening processes, because it is allowed to cool at room temperature. Other properties may include:

• Slightly rounded edges and corners for plate products (due to shrinkage and less precise finishing)
• Slight distortions
• More malleable and able to be turned into various shapes
• Increased ductility and toughness

Advantages of Hot Rolled Steel

Hot rolled steel tends to be cheaper than cold rolled steel because it is manufactured without any delays in the process and does not require reheating like cold rolled steel. It is also essentially normalized as it is allowed to cool at room temperature; this means it&#;s free from internal stresses that can arise from quenching or work-hardening processes.

Applications of Hot Rolled Steel

One of the many differences between hot and cold rolled steel is price. Hot rolled steel tends to be cheaper than cold rolled steel because it is manufactured without any delays in the process and does not require reheating like cold rolled steel. It can be used in applications where precise shapes and tolerances are not required, such as:

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• Structural Components (Railroad Tracks, I-Beams, Sheet Metal)
• Agricultural Equipment
• Metal Buildings
• Stampings
• Automotive Frames