When to Use Hot Rolled Steel Coil Supplier？

Hot Rolled Steel

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.

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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:

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

Cold Rolled Steel

Cold rolled steel is essentially hot rolled steel that has been further processed by being allowed to cool at room temperature and annealed or temper rolled. Cold rolling produces steel with closer dimensional tolerances and a wider range of surface finishes than hot rolling. It is also up to 20% stronger than hot rolled through the use of strength hardening.

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For precise shapes, consider:

1. Breakdown
2. Semi-Finishing
3. Sizing
4. Semi-Roughing
5. Roughing
6. Finishing

Advantages of Cold Rolled Steel

Cold rolled steel typically results in a product with a better, more finished surface with closer tolerances. It also yields smoother surfaces that are oily to the touch. Other advantages include:

• Can be used in precise applications
• Harder and stronger than hot rolled steels
• Increased hardness, resistance against tension breaking, and resistance against deformation due to work hardening
• Aesthetically pleasing finish with a wider range of surface finishes

Applications of Cold Rolled Steel

Cold rolled steel is used in applications where tolerances, surface conditions, concentricity, and straightness are factors. It also offers a more aesthetic and visually appealing surface. Other applications include:

• Home Appliances
• Metal Furniture
• Aerospace Structural Components
• Automotive Parts

Hot-Rolled steel has been rolled at high temperature from a cast steel slab more than two inches thick into steel coil as thin as 1/16 inches thick. Because the steel is rolled hot, and the reduction from slab to coil is great, the coil surfaces are noticeably rough and slightly oxidized therefore it is recommended for precision thickness.Hot rolled steel coil is more affordable than cold rolled steel because it is not processed after it is hot-rolled except for pickling when required to remove surface scale. The mechanical properties of hot rolled steel, such as yield strength, tensile strength, and elongation, vary depending on the specific grade of steel and the processing parameters used during manufacturing.

Hot rolled steel coil generally has good weldability, machinability, and formability, making it suitable for a wide range of applications. Hot rolled steel retains its inherent strength properties, making it suitable for structural applications where strength and durability are essential. It is also highly malleable and can be easily shaped and formed into various geometries without compromising its strength. While hot rolled steel typically has a scaled surface finish due to the rolling process, this rough texture can provide better adherence for coatings, paints, and other surface treatments. Additionally, the surface scale can be removed through further processing if a smoother finish is desired. If surface finish is a concern, check out our HRPO+ steel coil products for further benefits.

As a hot rolled steel coil supplier, we will be glad to help you select the exact grade for your specific needs. Contact our experts today for a quick quote and turnaround.

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