How to draw a distinction between hot rolled steel and cold rolled steel?
In the steel industry, hot rolled steel and cold rolled steel are considered the two common major raw materials. In the actual purchase, we can often find that customers ask the steel pipe manufacturers about the differences between hot rolled steel and cold rolled steel. There are some fundamental differences between these two types of metal. These differences relate to the ways these metals are processed at the mill, but not the product specification or grade.
In general, erw steel pipe is manufactured by hot rolled coils or cold rolled coils at the mill. Obviously, it is significant for you to know further more information about these two different types of material in life.
- hot rolled steel
Hot rolling is a mill process which involves rolling the steel at a high temperature (typically at a temperature over 1700° F), which is above the steel’s recrystallization temperature. When steel is above the recrystallization temperature, it can be shaped and formed easily, and the steel can be made in much larger sizes. Hot rolled steel is typically cheaper than cold rolled steel due to the fact that it is often manufactured without any delays in the process, and therefore the reheating of the steel is not required (as it is with cold rolled). When the steel cools off it will shrink slightly thus giving less control on the size and shape of the finished product when compared to cold rolled.
- cold rolled steel
Cold rolled steel is essentially based on the hot rolled steel that has had further processing. The steel is processed further at temperatures that are close to the level of normal room temperature , 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. The term Cold Rolled is generally used to refer to the flat rolled sheet or the coil products. Cold rolled steel pipe is a very common type of pipe in the steel market. This type of pipe has been widely used in a variety of applications in life and production activities today.
As a rule, a finished product after the cold rolled processing tends to be much precise dimensionally compared with a hot rolled product. As a result, the steel pipe price is relatively high in comparison with hot rolled one in the steel market.
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