Is the welded pipe hot rolled or cold rolled?

Welded pipe production process:
Welded pipe, also known as welded steel pipe, is a steel pipe made by applying welding technology to roll steel plate or strip into a tube shape, and then flattening, crimping, welding and leveling. Generally, the production processes of welded pipes are divided into two types, namely cold rolling and hot rolling.

Composition and characteristics of welded pipe:
The raw materials of welded pipes are mostly black steel plates, whose main components are carbon and manganese. During the welding process, the composition of the welded joint changes, and carbon and other elements undergo chemical reactions. Therefore, the welded area is usually more susceptible to corrosion than the non-welded area.

Welded pipes are widely used because of their light weight, low price, high strength, and easy processing. However, due to changes in the welding process and the influence of the pipe composition, the physical properties of welded pipes sometimes have certain deficiencies.

The difference between hot rolling and cold rolling of welded pipes:
1. Hot rolling
Hot rolling is a process processed at high temperatures. At high temperatures, steel has good plasticity and plasticity and can quickly adapt to millisecond-level deformations. Therefore, hot rolling can produce thick-walled welded pipes with a smooth surface. However, processing at high temperatures will cause changes in the crystal structure of the material, resulting in a decrease in fracture toughness and limited processing accuracy.

2. Cold rolling
Cold rolling is a process that takes place at room temperature. Because it is processed at room temperature, its processing accuracy is high and the toughness and stretchability of the material will not be reduced due to processing, so the cold-rolled welded pipe also has good strength and toughness. However, the production process of cold-rolled welded pipes is slow and the cost is relatively high.

Application differences between hot rolling and cold rolling:
Due to its fast production speed and smooth surface, hot rolling has a wide range of applications. Hot-rolled welded pipes are commonly used in construction, machinery, petroleum and chemical industries. Due to its good strength and deviation, cold-rolled welded pipe is usually used to manufacture high-precision parts, such as automobiles, electrical appliances, precision instruments and other fields.

Summarize:

This article introduces the production process and ingredients of welded pipes, and explains its characteristics and the differences between cold rolling and hot rolling, so that readers can have a deeper understanding of welded pipes. In the actual selection, it needs to be considered according to the specific situation in order to achieve the best application effect.

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