Cold rolled steel coils are produced by rolling hot rolled steel coils at room temperature. The cold rolling process enhances the steel's strength, precision, and surface finish. Cold rolled steel coils are known for their superior surface quality, tight tolerances, and excellent mechanical properties, making them ideal for applications that require high precision and aesthetic appeal.

Cold Rolled Steel Coil Characteristics:

Superior Surface Finish: Cold rolled steel has a smooth, glossy surface finish that makes it suitable for products that require an attractive appearance and high-quality surface.

High Dimensional Accuracy: The cold rolling process ensures precise thickness and uniformity, providing tight tolerances that are ideal for industries requiring high precision.

Increased Strength: Cold rolling enhances the steel’s mechanical properties, such as tensile strength and yield strength, making it more suitable for structural applications.

Good Formability: Although cold rolled steel is harder than hot rolled steel, it still maintains good formability, which is ideal for applications requiring bending or shaping.

Manufacturing Process

Pickling and Annealing

Cold rolled steel begins with hot rolled coils, which are pickled to remove scale and impurities. The steel is then annealed (heated and cooled) to improve its mechanical properties, providing the necessary strength and ductility for further processing.

Cold Rolling

The steel is rolled at room temperature through a series of rollers to achieve the desired thickness and surface finish. The cold rolling process helps to refine the steel’s properties and achieve tight dimensional tolerances.

Surface Treatment

After rolling, the steel may undergo additional surface treatments, such as galvanizing or coating, to improve corrosion resistance and enhance the appearance.

Coiling and Packaging

The final cold rolled steel coils are carefully coiled and packaged for delivery. The coils are wrapped to prevent surface damage during transportation and storage.

Quality Control

We ensure the highest quality standards through rigorous testing and control measures during every stage of the production process:

Chemical Composition Testing

We conduct comprehensive chemical analysis on each batch of cold rolled steel to ensure the material meets international standards such as ASTM, JIS, and EN. This guarantees that the steel has the correct balance of elements, such as carbon, manganese, and silicon, to achieve the desired mechanical properties.

Dimensional and Surface Quality Checks

Each coil is inspected for dimensional accuracy (thickness, width, and length) and surface quality. We utilize state-of-the-art measurement devices and visual inspection to ensure the coils meet strict quality requirements.

Mechanical Property Testing

Tensile strength, yield strength, elongation, and hardness are measured to confirm that the steel has the necessary strength and ductility for the intended application.

Environmental and Safety Standards

Our production processes adhere to strict environmental and safety standards. We minimize emissions and waste and ensure that our manufacturing processes are safe for both employees and the environment.