Cold rolling of steel coils is a metalworking process that involves passing previously hot-rolled steel coils through a series of rollers at room temperature. This process is performed to achieve specific dimensional precision, surface finish, and mechanical properties in the steel. Cold rolling imparts a smoother surface, tightens thickness tolerances, and enhances the strength and hardness of the steel. It is commonly used to produce thin gauge sheets, strips, and coils for various applications, including automotive, construction, and manufacturing, where precise dimensions and high-quality surface finishes are essential.
Cold Rolling & Processing
Pickled Coil, Cold Rolled Coil, Annealed Coil, Galvanized Coil, Color Coated Coil
Pickling Line (PL)
Pickling of steel coils is a process in which hot rolled coiled steel undergoes pickling, a surface treatment to remove oxide scale and impurities. The steel coils are typically immersed in an acid solution, such as hydrochloric acid, to clean and prepare the surface for further processing. This pickling step removes rust, scale, and other contaminants, resulting in a clean and reactive steel surface. After pickling, the steel coils may undergo additional processes, such as rinsing and drying, before further manufacturing steps like cold rolling or coating. The pickling line is crucial for improving the quality and surface characteristics of steel coils.
Cold Rolling Mills (CRM)
Reversing Cold Mill (4Hi, 6Hi)
The direction of rolling can be reversed, allowing for a back-and-forth process.
Tandem Mill
Involves a series of rolling stands arranged in tandem, with each stand reducing the thickness further.
Sendzimir Mill (Z-Mill)
Uses multiple small-diameter work rolls and a cluster of backing rolls to achieve high reductions and superior surface finish.
PL-TCM
Pickling Line – Tandem Cold Mill is a type of processing line in the steel industry that combines a pickling line with a tandem cold rolling mill. The purpose of the PLTCM is to efficiently produce cold-rolled steel coils with specific qualities and characteristics.
Skinpass/Temper Mill
Applies a light cold reduction to improve surface finish, flatness, and mechanical properties.
Annealing
Annealing of cold-rolled coils is a heat treatment process that involves heating the steel coils to a specific temperature and then cooling them in a controlled manner. This process is designed to modify the internal structure of the cold-rolled steel, imparting certain properties, and improving its mechanical characteristics. Annealing helps relieve internal stresses, enhance ductility, improve hardness, and refine the grain structure of the steel. The resulting annealed cold-rolled coil exhibits improved formability, toughness, and other desired properties, making it suitable for various applications in industries such as automotive, construction, and manufacturing.
Batch/Box Annealing
Cold Rolled Coils are place in batch type furnaces or box-like chambers allowing for controlled heating to the annealing temperature and cooling conditions
Continuous Annealing Line (CAL)
Coils move through a continuous annealing furnace, providing a continuous and automated process for heating and cooling.
Offers high production efficiency and is commonly used for large-scale production.
Coil Galvanizing Line (CGL)
The coil galvanizing line aims to produce galvanized steel coils with enhanced corrosion resistance, making them suitable for various applications in construction, automotive, and other industries where protection against rust and corrosion is crucial. The process provides a durable and cost-effective solution for preserving the integrity of steel products in challenging environments.
Continuous Annealing & Galvanizing Line (CAGL)
Continuous Annealing and Galvanizing Lines (CAGLs) play a crucial role in the steel industry, especially for the production of high-quality galvanized steel coils. These coils find extensive use in construction, automotive manufacturing, and various industries where corrosion-resistant steel is indispensable. The continuous operation of CAGLs not only enhances efficiency and ensures consistent product quality but also positions them as ideal for big volumes production, meeting the high demands of diverse industrial applications.
Color Coating Line (CCL)
Color coating lines are essential for producing pre-painted steel products used in various applications, including building materials, home appliances, automotive components, and more. The ability to apply decorative and protective coatings in a controlled and continuous manner makes color coating lines valuable for creating aesthetically pleasing and durable steel products.