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According to different uses, seamless steel pipe has three types of steel pipe s

2021-11-16 14:25:10   COMMENT:0 HITS:
1. Supply according to chemical composition and mechanical system performance;
2. Supply according to mechanical properties;
3. Supply according to hydrostatic test.
Seamless steel pipes include special seamless pipes, boiler seamless pipes, geological seamless pipes and petroleum seamless pipes. Welded steel pipe, also known as welded pipe, is made of steel plate or steel strip die welded steel pipe.
Welded steel pipe has the advantages of simple production process design, high production efficiency, many varieties and specifications, and less equipment investment, but the total strength is lower than that of seamless steel pipe.
Since the 1930s, with the rapid and healthy development of economic high-quality strip continuous rolling production and the continuous improvement of welding method detection information technology, the problem of weld quality has been continuously improved, the variety and specification of welded steel pipe have been continuously increased, and seamless steel pipe has been replaced in more and more fields. In the welding process, the steel pipe can be divided into straight welded pipe and spiral welded pipe according to the weld structure.
The production technology of longitudinal welded pipe has the advantages of simple process, high production efficiency, low cost and rapid economic development. Generally, the strength of spiral welded pipe is higher than that of straight welded pipe. It can produce welded pipe with larger diameter with narrow blank, or produce welded pipe with different diameter with blank of the same width.
However, compared with the straight seam pipe with the same length, the weld length can be increased by 30 ~ 100%, and the production speed is relatively low for enterprises. Therefore, straight seam welding is mostly used for small-diameter welded pipes, and spiral welding is mostly used for large-diameter welded pipes.

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