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The Difference between Seamless, Welded, Spiral and Galvanized Steel Pipe

Date:2019-04-04    keywords:seamless, welded, spiral and galvanized steel pipe

1) The seamless pipe is a long strip of steel with a hollow section and no joints around it. It is a steel pipe without seams, hot rolling or cold drawing process. Seamless steel pipe characteristic is that its pressure endurance is fairly good.


2) Welded steel pipe, also called welded pipe, is a steel pipe made by welding a steel plate or a strip steel after being crimped. Can be divided into straight seam welding and spiral seam welded steel pipe. More than an inappropriate example, you roll rectangular white paper into a tube, and then the edge is welded is a straight seam welded pipe, if you roll up and then welded, it is a spiral seam welded steel pipe. The welded steel pipe has a simple production process, high production efficiency, many varieties and specifications,  the strength is generally lower than that of the seamless steel pipe, more than 800mm are welded steel pipes, which are welded by steel plates, which is determined by the current state of the art.

3) Features of spiral tube: Straight seam welded pipe has simple production process, high production efficiency and low cost. The strength of spiral welded pipe is generally higher than that of straight welded pipe. It can produce narrow welded pipe with narrow blank, and can also use the same width. The billet is produced with different diameters of the welded pipe. However, compared with the straight pipe of the same length, the weld length is increased by 30 to 100%, and the production speed is low. Therefore, most of the smaller diameter welded pipes are straight seam welded, and the large diameter welded pipes are mostly spiral welded.

4) Galvanized steel pipe is galvanized on the surface of the steel pipe. The inner and outer surfaces are galvanized to provide corrosion resistance. It can be a seamless steel pipe or a welded steel pipe, and both the welded steel pipe and the seamless steel pipe can be galvanized into a galvanized pipe.

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