Cold rolled steel is essentially hot rolled steel that has had further processing. The steel is processed further in cold reduction mills, where the material is cooled (at room temperature) followed by annealing and/or tempers rolling. This process will produce steel with closer dimensional tolerances and a wider range of surface finishes.
When referring to bar products, the term used is “cold finishing”, which usually consists of cold drawing and/or turning, grinding and polishing. This process results in higher yield points and has four main advantages:
- Cold drawing increases the yield and tensile strengths, often eliminating further costly thermal treatments.
- Turning gets rid of surface imperfections.
- Grinding narrows the original size tolerance range.
- Polishing improves surface finish.
All cold products provide a superior surface finish, and are superior in tolerance, concentricity, and straightness when compared to hot rolled.
Cold finished bars are typically harder to work with than hot rolled due to the increased carbon content. However, this cannot be said about cold rolled sheet and hot rolled sheet. With these two products, the cold rolled product has low carbon content and it is typically annealed, making it softer than hot rolled sheet.
Cold-Rolled Steel coils/sheets are extensively used as basic materials in automobiles, electrical appliances, steel office equipment, various types of containers, and numerous other products closely connected to our daily lives (Any project where tolerances, surface condition, concentricity and straightness are the major factors).
We offer a wide range of Cold-Rolled Steel Sheets in accordance with Japanese Industrial Standards (JIS).
General-Purpose Cold-Rolled Steel Sheets and Coils (JIS: G 3141)