Welded steel pipe, also called welded pipe, is a steel pipe made by welding a steel plate or strip after crimping.
. Welded steel pipe production process is simple, high production efficiency, variety specifications, equipment investment, but the general strength is lower than the seamless steel pipe. Since the 1930s, with the rapid development of the production of high-quality strip continuous rolling and the progress of welding and inspection technology, the quality of welds has been continuously improved, and the variety and specifications of welded steel pipes have been increasing and replaced in more and more fields. Steel pipe. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes in the form of welds.
The straight seam welded pipe has a simple production process, high production efficiency, low cost, and rapid development. The strength of the spiral welded pipe is generally higher than that of the straight seam welded pipe. A narrower blank can be used to produce a larger diameter pipe, and a blank having a different diameter can also be produced using a blank of the same width. However, compared with the straight seam pipe of the same length, the length of the weld seam increases by 30 to 100%, and the production speed is low. Therefore, the smaller diameter welded pipe mostly adopts the straight seam welding, and the large diameter welded pipe adopts the spiral welding.
Low-pressure fluid transport welded steel pipe (GB/T3091-2008) is also called general welded pipe, commonly known as black pipe. It is a welded steel pipe used for the transportation of water, gas, air, oil, heating steam, and other generally lower pressure fluids and other uses. The wall thickness of the steel pipe is divided into ordinary steel pipe and thick steel pipe; the pipe end is divided into non-threaded steel pipe (light pipe) and threaded steel pipe. The welded steel pipe used for low-pressure fluid transportation is not only directly used for conveying fluids, but also used as a raw pipe for galvanized welded steel pipes for low-pressure fluid transportation.
1. Galvanized welded steel pipe for low pressure fluid delivery (GB/T3091-2008) Also known as galvanized welded steel pipe, commonly known as white pipe. It is a hot dip galvanized welded (furnace or welded) steel pipe used to transport water, gas, air oil, heating steam, warm water, and other general lower pressure fluids or other uses.