Tianjin welded steel pipe classification in the market

Today, Tianjin steel pipe is playing a vital role in the steel pipe industry around the world. Especially Tianjin welded steel pipe become a favor among many users from different countries in the world. Generally, Tianjin welded steel pipe can be divided into straight seam welded pipe and spiral welded pipe as per different shapes of welded steel pipe. The straight seam welded pipe undergoes much simpler processing method than the spiral welded pipe does. Furthermore, thanks to its low manufacturing costs, straight seam welded pipe wins fast development prospect. However, the strength of spiral welded pipe is generally higher than that of straight seam welded pipe because the later is made from a narrow billet production into a larger diameter welded steel pipe. As a result, straight seam welded steel pipe usually has a small diameter while the spiral welded steel pipe mostly has large diameter.

In the current steel pipe market, there are a variety of types of welded steel pipe for your choice. Sometimes, you may be confusing about how to choose the proper type of steel product in your project. Here we would like to talk about some common types of welded steel pipes in the market. One process for producing pipe is fusion weld, sometimes called “continuous weld”, which is produced in size1/8’’ to 4~12’’. Fusion weld pipe begins as coiled steel of the required width and thickness for the size and weight of pipe to be made. Successive coils of steel are welded end to end to form a continuous ribbon of steel. The ribbon of steel is fed into a leveler and then into a gas furnace where it is heated to the required temperature for forming and fusing. The forming rolls at the end of the furnace shape the heated skelp into an oval. The edges of the skelp are then firmly pressed together by rolls to obtain a forged weld. The heat of the skelp, combined with the pressure exerted by the rolls, form the weld. No metal is added into the operation. Final sizing rolls bring the pipe into its required dimensions. In the recent years, China hollow section tube manufacturers are committed to providing customized welded steel pipes for users around the world.


Another common type of welded steel pipe in the market is ERW pipe. The processing of electric resistance welded pipe begins as a coiled plate of steel with appropriate thickness and specific width to form a pipe that conforms to its relevant specifications. ERW pipe is cold formed. For example, cold rolled steel pipe is very popular in a variety of applications in the recent years. The ribbon is pulled through a series of rollers that gradually form it into a cylindrical tube. As the edges of the now cylindrical plate come together, an electric charge is applied at the proper points to heat the edges so they can be welded together.