Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.
Electric Resistance Welded, often abbreviated as ERW, is a process that uses specific machinery to shape the pipe and tubing. A continuous steel sheet is unwound from a coil and shaped using contoured rollers, forcing the edges together under pressure. These edges are then welded together by heating the material to over 2,000 degrees. After welding, the pipe or tubing is cut into the exact size needed.
SAW is normally operated in the automatic or mechanized mode, however, semi-automatic (hand-held) SAW guns with pressurized or gravity flux feed delivery are available.
SAW pipe is made of hot rolled coiled steel by automatic submerged arc weld under normal
atmospheric temperature. All the pipes are produced according to API Spec 5L, GB/T9711.1, GB/T9711.2, ASTM A252-89 standard. These pipes mainly used in petroleum and natural gas industry to transport flammable and non-flammable liquid and steel construction.
SAW means submerged arc weld ,it can be classified into LSAW and SSAW
ASTM A672: American Society for Testing and Materials
Eletric- Fushion- Welded for High-Pressure Service at Moderate Temperatures
Application: Power plant; Chemical Fertilizer; Petrochemicals; Offshore Oils; Gas Productions; Refineries and etc.
The specification covers pipes with wall thicknesses of up to 3 inches (76.2 mm) for use in various applications. The pipes are manufactured using electric fusion welding techniques and are available in various grades and classes, including Class 10, Class 11, Class 12, Class 13, Class 20, Class 21, Class 22, Class 23, Class 30, Class 31, Class 32, Class 33, Class 40, Class 41, and Class 42. The ASTM A672 specification is commonly used for welded pipes in carbon steel, low alloy steel, and stainless steel grades.
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