Welded Steel Pipes (Welded Pipes)
Welded Steel Pipes
Welded Pipe is manufactured by rolling metal and then welding it longitudinally across its length, therefore welded pipes have a welded joint in its cross-section.
There are two(2) sub-categories for Seamless Steel Pipes. These are Carbon Steel Pipes and Stainless Steel Pipes.
Carbon Steel Welded Pipes
In Carbon steel, the main alloying element is carbon, it has a higher carbon content, which gives the steel a lower melting point, more malleability and durability, and better heat distribution.
Stainless Steel Welded Pipes
Stainless steel characteristically has a minimum of 10.5% chromium by weight, means has a larger percentage of chromium in it as compared to carbon steel, which is what grants it the ability to resist corrosion.
Below are the types of Welded Steel Pipes:
Electric Resistance Welded (ERW) Pipes are welded longitudinally manufactured from Strip / Coil and can be manufactured upto 25″ OD. ERW pipe cold formed from a ribbon of steel pulled through a series of rollers and formed into a tube which is fused through a electric charge. It is mainly used for low / medium pressure applications such as transportation of water / oil. Applicable for both Stainless Steel Pipes and Carbon Steel Pipes.
Electric Fusion Welded (EFW) Pipe is a welded pipe formed by rolling plate and welding the seam. The EFW pipe is the most popular process for large diameter pipe uses a longitudinal seam weld. The welds are made by heating with an electric arc between the bare metal electrodes. Applicable only to Carbon Steel Pipes.
LSAW PIPES (Straight Welded Pipes)
Longitudinally Submerged Arc Welding (LSAW) pipes use single plate steel as raw material, applied double-sided submerged arc welding. The finished products have larger specifications and the welding joints have excellent ductility, plasticity and good sealing. LSAW pipes have large diameter, thick applicable only to Carbon Steel Pipes.
SSAW PIPES (Spiral Pipes, Spiral Welded Pipes)
SSAW Pipe (Spiral Submerged Arc-Welding Pipe) also called HSAW pipe, welding line shape like a helix. It is using the same welding technology of Submerged Arc-Welding with LSAW Pipes. Differently SSAW pipe is spiral welded where the LSAW is longitudinally welded. Manufacturing process is rolling the steel strip, to make the rolling direction have an angle with the direction of the pipe center, forming and welding, sot he welding seam is in a spiral line. Applicable only to Carbon Steel Pipes.