Differences between Hot Rolled and Cold Rolled Seamless Steel

Posted by Deepak Seth on January 23rd, 2023

What are the differences between hot-rolled and cold-rolled seamless steel tubes?

The term “hot-rolled steel tube” refers to a steel tube that has been rolled in a furnace at a high temperature, usually in the range of 1,200 to 1,500 degrees Celsius. There are two parts to a hot-rolled steel tube: the outer layer and the inner core. The outer layer is formed by heating molten metal (usually iron) to temperatures exceeding 1,200°C. In the inner core, molten metal is mixed with impurities such as carbon or sulfur, which are not present in the outer layer. 

It is necessary to heat these two layers together at very high temperatures (1,500 °C or higher) in order to reduce friction during welding or cutting processes. In order to weld or cut the tube parts. When welding at high temperatures, the inner layer is drawn into a long cylindrical shape. Pipes, tubing, and other products requiring strength in order to resist stresses are generally made from hot-rolled steel tubes.

Various industries use steel tubes, which are a common product. cooteel tubes come in different types and have different properties. Compared to cold rolled steel tubes, hot rolled coil steel tubes have a higher tensile strength, but they are also more prone to damage. Hot Rolled Vs Cold Rolled.

Hot-rolled steel tubes are seamless steel tubes that have been rolled in a process define rolling process (or hot-rolling process). Hot-rolled steel tubes are manufactured by passing sheet metal through an extrusion press at 1,800°C before being pressed into shape. The cold-rolled or cold-forming process involves passing the sheet metal through a die that cools in water for about one week. 

In addition to general cold formed steel pipes, low-pressure boiler pipes, high-pressure boiler pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, cold-rolled seamless steel pipes include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless steel pipes, profiled steel pipes.

The outer diameter of the hot-rolled seamless pipe is generally larger than 32mm, and the wall thickness is 2.5-75mm. Cold-rolled seamless steel pipe can reach a diameter as large as 6mm with a thickness of 0.25mm, and thin-walled pipes can reach a diameter of 5mm with a thickness of less than 0.25mm. Hot rolling and cold rolling is less accurate than cold rolling.

Cold-rolled seamless steel pipes have small diameters, and hot-rolled seamless steel pipes have large diameters. Cold-rolled seamless steel pipe is more accurate and more expensive than hot-rolled seamless steel pipe.

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