Do check out this otahuhuengineering. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. We are proud to announce that Steelo has taken on the legacy of Builder's Beams! At Steelo your steelwork is in safe hands. Hot rolled steel Hot rolled steel is easier to make, to shape and form. Disadvantages — dimensional imperfections caused by heating expanding and cooling down shrink, warpage — rough texture on a surface, need to be removed and buffed before painting — Slight distortions Cold rolled steel While hot rolled steel is heated then cooled, cold rolled steel is heated and cooled at the room temperature and then rolled after again.
Advantages — accurate shape consistent and straight — a wider range of surface finishes — a smooth and shinier surface — bars are true and square and have well-defined edges and corners — Tubes have better concentric uniformity and straightness. How to differentiate them?
Leave new. Mike Sanders. The process of cold drawing steel involves pushing or pulling the rod through a die to form the steel into its shape. While the process can be less expensive than cold rolling steel depending on the shape , it may require several iterations, or cold drawing passes, to achieve the desired profile, which increases material handling and processing costs. In terms of mechanical properties, cold drawn steel does not possess the superior hardness and smooth finish achieved by cold rolling steel.
In cold rolling, the high pressure of the rolling mills mechanically works the steel, which causes changes in the mechanical properties including increased tensile strength, hardness and weld-ability, along with decreased ductility as the grain structure is changed. How to identify hot rolled steel?
Cold rolled steel — as the name suggest is not completed at high temperatures. It is essentially hot rolled steel but put through more processes. Once the hot rolled steel has been left to cool, it is then re-rolled but at room temperature to achieve a better surface finish and more precise dimensions. Cold rolled steel involves the process of rolling out sheets- this causes the steel to harden due to the increased pressure used to form its new shape- rolling also causes the steel to have improved mechanical properties.
Cold rolled steel is less malleable than hot rolled, making it limited to only a few simple shapes. However recent methods of uniform cross sections and transverse dimension had resulted in forming other cold rolled shapes. The surface characteristics of cold rolled steel are more improved than that of hot, and is often used in applications where appearance is important, such as parts on automobiles, however due to the cold rolled steel going through more processes than hot, it does result in a higher price.
In terms of physical characteristics, cold rolled steels are typically harder and stronger than standard hot rolled steels. Cold drawn steel is also processed at room temperature- alike cold rolled. Hot rolled bars or hot rolled coils are bought down to room temperature, the steel is then hammered and rolled to ensure it fits through a die.
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