Cold Rolled Steel Sheet in Coil
Cold rolled steel sheet in coil is a mill product with very close dimensional tolerances. It also has good forming properties and is very strong.
During shipment and storage cold rolled steel is susceptible to corrosion, so it is packaged in moisture-resistant paper with rust preventative oil applied to the surface. The packaging is secured with flat metal strapping bands placed longitudinally and transversely around the coil.
Strength
Cold rolled steel has an extremely high tensile strength, even higher than hot rolled steel. It also has excellent formability, making it ideal for applications that require shaping and bending. This quality makes it especially popular in manufacturing and construction industries.
Cold-rolled steel is formed at lower temperatures than hot-rolled steel, which allows it to retain a more precise thickness and finish. This is particularly beneficial for industries that require precision components, cold rolled steel sheet in coil such as automotive and furniture manufacturers. Cold rolled steel also typically has a smoother surface, which helps to reduce the risk of corrosion.
This type of steel is often oiled to protect it from damage during shipment and warehousing. Curtis Steel uses a special rust-preventative oil that is applied at the temper mill, in addition to maintaining clean, climate-controlled warehouses to ensure that our customers receive their coils in prime condition.
During the processing of cold rolled steel, the material undergoes work hardening, which increases its mechanical properties. As a result, it has greater resistance to tension breaking and deformation than hot rolled steel. Additionally, it has superior weldability and can withstand a variety of forming operations. Depending on the application, cold rolled steel can be further treated with coatings or surface treatments to improve its corrosion resistance and aesthetics. These coatings can help the material withstand harsh environments, such as in marine applications or industrial facilities.
Durability
Cold rolled steel is ideal where dimensional tolerances and surface finish are important, and it’s commonly used for projects like domestic appliances and metal containers. It can also be coated in various finishes to help protect it from corrosion.
During the hot rolling process, metal crystals are naturally reformed to create a rough texture and look, and these coarse metal grains give hot rolled steel its typically rusty and stained appearance. To remove these scales and stains, the metal can be blasted or immersed in an acid solution known as pickling. This descales the steel, removing its rust and leaving it with a polished texture that’s more resistant to corrosion.
After being blasted or pickled, the steel is reheated to a lower temperature and then cold rolled. This further refines the steel, creating a smoother texture with tighter dimensional tolerances. It’s then rolled again to achieve even more precise dimensions, making it harder and stronger than standard hot rolled steels.
This highly finished steel can then be cut into short sections, stacked into oblong packages and placed in an outer metal envelope. This packaging helps to keep the coil dry during storage and shipping. Exposure to rain during loading and discharging from ocean carriers can result in heavy claims if the steel is not kept completely dry. Moisture seeping from the surrounding packaging and accumulating beneath the metal wrapping can penetrate the plating, causing damage and facilitating rust.
Stability
Unlike hot-rolled steel, cold rolled metal has a high degree of product dimensional accuracy. This means it’s ideal for a variety of applications that require accurate thickness and a polished finish. Cold rolled steel also has a higher tensile strength than its hot counterpart, with a yield strength of up to 85,000 psi.
Cold rolled steel sheet in coil has a smooth surface that makes it easy to coat, paint or lacquer. It’s also resistant to corrosion, making it an excellent choice for a variety of manufacturing and fabrication processes. In addition, cold rolled coils can be roll-formed into different shapes and sizes without the risk of damage.
Coils of cold rolled steel should be stored and transported on wood supports (coil skids). The packaging should be tinned or galvanized to protect against moisture, as this can cause rust. Cold rolled coils that have been box annealed and are free of scale are highly desirable because they can be used for stamping, Tinplate Sheet Manufacturer moderate drawing and other processing. This type of coil is most suitable for a variety of industries, from construction and automotive to household appliances and manufacturing.
Aesthetics
Steel sheet in coil is commonly used for lighting fixtures because it can be formed into a variety of shapes and sizes and maintains tolerances better than other types of metal. It also has higher tensile and yield strengths and is compatible with many surface finishes, making it suitable for many types of home decor.
The cold rolling process involves reducing the thickness of metal by passing it through rollers at lower temperatures than the hot forming method. This process increases the material’s hardness and strength, but it also creates internal stresses that must be relieved before the finished product can be manipulated or bent without distortion.
Since cold rolled metal is not heated to high temperatures, it retains a more refined and polished appearance than hot rolled steel. Additionally, it does not shrink during the forming process, making it ideal for applications where aesthetics and precise dimensions are important. The more precise surfaces and tighter dimensional tolerances of cold-rolled steel sheet in coil also make it more appropriate for applications where the resulting products will be exposed to moisture or pollutants.