The steel industry heavily relies on cold rolling. The cold rolling process involves passing the desired sheet of metal between rollers. (Read more about different types of rolling mills and how to choose the rolling mill machine)

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Should the desired result be a sheet or harder and firmer metal, flat rolling is used. For rods or bars of metal, profile rolling is the correct method.

The beginning of the process involves hot rolling the metal, whereby the temperature of the rollers reaches 900 degrees Celcius or more.

The metal will then be processed into cold rolling, which involves letting the metal cool down to room temperature before pickling the metal. Pickling the metal involves removing the scale that is leftover from hot rolling. The scale will interfere with the process.

Thereafter, the metal is sent through rollers that are lower than the recrystallisation temperature. This helps to relieve stress from the metal. As a result, the metal will be stronger and harder.

Each cold rolling process will reduce the metal anywhere between 50 and 90 per cent. Plus, it will increase dimensional accuracy by up to 20 per cent.

What are the advantages and disadvantages of cold rolled steel profiles?

Cold rolled steel profiles are an important metallic material with many advantages and some disadvantages. The advantages and disadvantages of cold-rolled steel profiles will be introduced in detail below.

Advantage

1. Excellent mechanical properties: Cold-rolled steel profiles have excellent strength, hardness and toughness, making them the material of choice in many applications. Its high strength allows cold-rolled steel profiles to withstand heavy loads and high-pressure environments while maintaining structural stability.

2. Excellent surface quality: During the cold rolling process, the steel undergoes multiple passes of pressing, stretching and cooling, resulting in a high surface finish with no obvious defects and imperfections. This makes cold-rolled steel profiles widely used in applications that require high precision and high finish (such as automobiles, electronics, etc.).

3. Good processing performance: Cold-rolled steel profiles have good plasticity and processability, and can be made into parts and components of various shapes through cold bending, cold cutting, cold drawing and other processing methods. This makes cold-rolled steel profiles have broad application prospects in manufacturing.

4. Excellent corrosion resistance: Cold-rolled steel profiles are usually galvanized or other surface treated to form a protective layer that provides good corrosion resistance. This makes cold rolled steel excellent in corrosion-prone applications such as marine environments, chemical industries and outdoor structures.

Shortcoming

1. Higher cost: Compared with hot-rolled steel, the production process of cold-rolled steel profiles is more complex and requires more processes and equipment, resulting in higher production costs.

2. More energy consumption: The manufacturing process of cold-rolled steel profiles requires multiple cooling and reheating, which consumes a lot of energy and has a certain impact on the environment.

3. Slightly lower mechanical properties: Compared with hot-rolled steel, the mechanical properties of cold-rolled steel profiles are slightly lower, especially the cold-rolled steel is prone to deformation and springback, and further heat treatment is required to restore its original properties.

To sum up, cold-rolled steel profiles have excellent mechanical properties, surface quality and processing properties, as well as good corrosion resistance. However, its manufacturing cost is higher, it consumes more energy, and its mechanical properties are slightly inferior to hot-rolled steel. In practical applications, appropriate materials need to be selected based on specific needs and cost considerations.

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