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Standard for welded steel pipe
Jul 03, 2017

Welded steel pipe, also known as welded pipe, is a steel plate or steel band after the formation of welding welded steel pipe. Welded steel pipe production technology is simple, high production efficiency, varieties and specifications, equipment investment is less, but the general strength is lower than seamless steel pipe. Since 1930s, with the rapid development of high-quality strip rolling production and progress of welding and testing technology, and constantly improve the weld quality, varieties and specifications of welded steel pipe is increasing, and instead of the seamless steel pipe in more and more fields. The welded pipe is divided into longitudinal welded pipe and spiral welded pipe according to the form of weld.

The straight welded pipe production technology is simple, the production efficiency is high, the cost is low, and the development is faster. The strength of spiral welded pipe is generally higher than that of longitudinal welded pipe. The welded pipe with larger diameter can be produced with narrower billet, and the welded pipe with different diameters can be produced with the same width of billet. However, compared with the straight seam pipe of the same length, the weld length increases by 30~100%, and the production speed is low.

Therefore, most of the welded pipes with smaller caliber adopt straight seam welding, and large diameter welded pipes mostly adopt spiral welding.

Welded steel pipe for low pressure liquid delivery (GB/T3091-2008) also called general hanguan, commonly known as the clarinet. It is used to transport water, gas, air, oil and heating steam, and generally lower pressure fluid and other purposes of welded steel pipe. The wall thickness of the steel pipe is divided into ordinary steel pipe and thickened steel pipe. The end of the pipe is divided into non - threaded steel pipe (light pipe) and threaded steel pipe. The welded steel pipe for low pressure fluid transportation is used as the main pipe of galvanized steel pipe for low pressure fluid transportation except for directly conveying fluid.

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