Clients often ask us regarding the variations between hot rolled steel and cold rolled steel. There are some key differences between these two kinds of metal. The differentiation between cold rolled steel and hot rolled steel and relates to the way these elements are prepared at the factory, and not the product specification or standard. Hot rolled steel includes rolling the steel at huge temperatures, where cold rolled steel is prepared further in cold reduction mills where the element is cooled followed by annealing and/or tempers rolling.
Hot Rolled Steel
Hot rolling is a mill process that includes rolling the iron at a great temperature (typically at a heat over 1700° f), which is over the steel’s recrystallization warmth. When steel is higher than the recrystallization temperature, it can be developed and produced quickly, and the steel can be made in more comprehensive sizes. Hot rolled steel is typically more reasonable than cold rolled steel due to the point that it is frequently produced without any obstacles in the process, and therefore the rewarming of the steel is not needed(as it is with cold rolled). When the steel cools off it will shrink slightly thus giving less power to the size and shape of the completed product when related to cold rolled.
Uses: Hot rolled goods like hot rolled steel bars are used in the welding and building trades to make railroad tracks and i-beams, for example. Hot rolled steel is used in places where specific shapes and tolerances are not required.
Cold rolled steel is typically hot rolled steel that has had more processing. The steel is processed more in cold reduction factories, where the material is chilled(at room temperature) followed by annealing and/or passions rolling. This method will provide steel with tighter dimensional tolerances and a wider variety of surface finishes. The name cold rolled is falsely applied on all products when actually the material name refers to the rolling of flat-rolled sheet and coil products.
When referring to bar goods, the word used is “cool finishing”, which normally consists of cold design and/or turning, milling, and polishing. This method results in larger yield points and has four main benefits:
- Cold drawing improves the yield and tensile toughness, usually excluding further costly hot treatments.
- Turning gets relieved of surface defects.
- Grinding narrows the initial size limit range.
- Polishing enhances the surface finish.
All cold products give a better surface coating and are higher in understanding, concentricity, and straightness when compared to hot rolled.
Cold finished bars are typically more arduous to go with than hot rolled due to the elevated carbon content. However, this cannot be said about cold-rolled sheets and hot-rolled sheets. With these two products, the cold-rolled stock has low carbon content and is usually tempered, giving it more flexibility than a hot-rolled sheet.
Uses any plan where limits, surface condition, concentricity, and straightness are the major factors.
All you need to know about Biscosteels
Balu iron and steel company along with Balu cement corp are the fastest-growing divisions among the bisco group of companies having a group turnover of rs1350cr.
At biscosteels, we provide a wide variety of elements for a variety of purposes. Our stock includes
- Stainless steel
- Brass, galvanized steel
- Tool steel
- Alloy steel
Our hot rolled and cold rolled steel is available in a wide range of shapes including bars, tubes, sheets, and plates. We can cut metal to your exact specifications.