Classification by purpose
It is also divided into ordinary welded pipes, galvanized welded pipes, oxygen-blown welded pipes, silk sleeves, metric welded pipes, idler pipes, deep well pump pipes, automobile pipes, transformer pipes, welded thin-walled pipes, welded special-shaped pipes, scaffolding pipes and spiral welded pipes.
Ordinary welded pipe: Ordinary welded pipe is used for conveying low-pressure fluid. Made of steel Q 195A, Q2 15A and Q235A. It can also be made of other low carbon steels that are easy to weld. Steel pipes have to undergo water pressure, bending, flattening and other experiments, which have certain requirements for surface quality. Usually the delivery length is 4- 10m, and it is often required to deliver according to the length (or double the length). The specifications of welded pipes are expressed in nominal caliber (millimeters or inches). The nominal caliber is different from the actual caliber. Welded pipes can be divided into ordinary steel pipes and thickened steel pipes according to the specified wall thickness, and steel pipes can be divided into threaded and non-threaded pipes according to the pipe end form.
Galvanized steel pipe: In order to improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into hot dip galvanizing and electrical steel zinc. Hot-dip galvanizing has a thick zinc layer and low cost.
trait
The production process of straight welded pipe is simple, with high production efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. Welded pipes with larger diameters can be produced from narrow blanks, and welded pipes with different diameters can also be produced from blanks with the same width. However, compared with the straight seam pipe with the same length, the weld length increases by 30~ 100%, and the production speed is lower.
application area
Products are widely used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction, and are one of the 20 key products developed by the state.
Used for liquid transportation: water supply and drainage. Used for gas transportation: gas, steam, liquefied petroleum gas.
Used for structure: used for piling pipes and bridges; Pipes for docks, roads, building structures, etc.