Hot rolled and cold rolled steel specifications
Most steel are manufactured through the process of hot rolling or cold rolling. Hot rolling is a process that lasers iron ore, steel scrap and other iron and steel raw materials through a heated furnace to obtain a hot-rolled product of a certain thickness, width and length. Cold rolling is a process in which hot-rolled coils or stainless steel metal sheets are passed through cold rolling machines. The processed steel sheets will become thinner and longer after rolling. In this article, we will discuss the basic specifications for hot rolled and cold rolled steel and their applications.
Hot rolled steel is defined as a metal that can be formed when temperature exceeds 1100°F (600°C). Hot rolled steel is usually an alloy of carbon, iron and other metals such as nickel and manganese. The use of hot rolled steel can be found in applications involving the automobile and construction industries. Hot rolled steel has a tendency to become harder and stronger due to the low carbon content and subsequent quenching and tempering process.
The size and shape of hot rolled steel typically depends on the customer’s requirements, but generally fall within the following range: thickness range between 2.0mm and 12.7mm and width range between 900mm and 2000mm. The tolerances for hot rolled steel depend on the grades and standards and will vary across industry. The surface finish for hot rolled steel will depend on the specific order and typically includes black scales, bright, smooth surface, matte surface, and pickled surface.
Cold rolled steel is defined as metal that is formed by processing drum-pickled hot rolled flat sheet in a cold reduction process. Cold rolled steel is different from hot rolled steel because it is processed in an entirely different manner. Cold rolled steel is processed in cold reduction mills where the material is cooled at room temperature. Cold rolling is a process used to improve the surface finish, hardness, tensile strength, and yield strength of the steel.
The size and shape of cold rolled steel typically depends on the customer’s requirements, but generally fall within the following range: thickness range between 0.5mm and 6.0mm and width range between 900mm and 2000mm. The tolerances for cold rolled steel depend on the grades and standards and will vary across industry. The surface finish for cold rolled steel will depend on the specific order and typically includes black, pickled, bright, galvanized, and electro-galvanized.
The weight of both hot rolled and cold rolled steel varies depending on the size, shape, and thickness of the product. Generally speaking, cold rolled steel will weigh more than hot rolled steel due to its higher density.
Overall, hot rolled and cold rolled steel plays an important role in many industries due to their unique properties and differing forms. Hot rolled and cold rolled steel is widely used for applications involving the automotive and construction industries, such as structural components and tools. With the help of this article, you should now have a better understanding of the difference between hot rolled and cold rolled steel as well as their basic specifications and uses.
