Galvanized pipe is a kind of light thin-walled steel pipe with hollow square section, also known as cold-formed section steel. It is a square section steel with shape and size formed by cold bending and high frequency welding with Q235 hot rolled or cold rolled strip or coil as the base material. In addition to wall thickening, the edge size and flatness of hot-rolled galvanized steel pipe can reach or even exceed the level of resistance welding cold bending galvanized steel pipe. The main welding process is galvanized steel pipe welding.
The welding galvanized steel pipe can be used to produce larger diameter welded pipe with narrow blank, or different diameter welded pipe with the same width blank. However, compared with the same length of straight seam galvanized steel pipe, the weld length increases by 30-100%, and the production speed decreases.
Large diameter or thick welded galvanized steel pipe is generally made of steel billet directly, while small welded thin-wall welded pipe can be directly welded by steel strip. After simple polishing, the drawing is finished. Therefore, the welded pipe with smaller diameter is mostly straight seam welding, and the welded pipe with larger diameter is mostly spiral welding. It has good comprehensive mechanical properties, weldability, cold and hot working performance, corrosion resistance and good low temperature toughness.
Galvanized steel pipe production process is simple, high efficiency, low cost, rapid development. The strength of spiral welded pipe is generally higher than that of galvanized steel pipe. It can produce welded pipe with larger diameter and narrower blank, or welded pipe with different diameter and the same blank width. However, compared with the straight pipe of the same length, the weld length increases by 30-100%, and the production speed decreases.
Therefore, the galvanized pipe with smaller diameter mostly adopts straight seam welding, and the galvanized pipe with larger diameter mostly adopts spiral galvanized steel pipe. According to the shape of cross-sectional area, it can be divided into circular pipe and special-shaped pipe. Because the circle has the largest area and the same circumference, it can be used to transport more fluid. In addition, under the action of internal and external radial pressure, the force is relatively uniform, so most of the steel pipes are round.
The above is the relevant content introduced by Jinan galvanized pipe manufacturer. For more information, please visit the website: http://www.jnxxjm.com