The Process and Classification of Longitudinal Welded Pipe

The Process and Classification of Longitudinal Welded Pipe


Straight seam welded pipe is a kind of welded steel pipe, steel plate or steel strip is crimped after the welding made of steel pipe. Straight seam welded 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 high-quality strip rolling production and the progress of welding technology, straight seam welded pipe quality continues to improve, variety, specifications are increasing, and in more and more areas instead of seamless steel pipe.
According to the form of welding, straight seam welded steel pipe can be divided into straight seam welded pipe and straight seam submerged arc welded pipe.
(1) Straight seam resistance welded pipe
Resistance welded pipe is the earliest production, the most widely used, the largest production units, the highest yield of steel pipe, straight seam welded pipe product specifications for the φ20mm a φ610mm, played an important role in the national economic construction. Which φ20mm ~ φ89mm steel pipe unit the largest number of its total production capacity of the unit more than 60%. Because of the low investment, low technological level and low cost, the products are widely used in low pressure fluid transportation steel pipe and construction scaffolding steel pipe, bicycle, furniture structure steel pipe. The φ219mm ~ φ610mmERW steel pipe unit since the 1980s since the introduction of more than 30 sets from abroad, more advanced technology, after years of production practice, equipment and technical level has greatly improved, steel pipe product quality is also improving. Such units due to less investment, quick, wide range of applications and rapid development. Plate CSP production process development, to provide a low-cost, reliable quality of raw materials, and straight seam welded steel pipe in the future to further develop the creation of a good condition. This part of the product has been fluid transmission, the structure of the field of seamless pipe applications to the field of steel pipe, pipeline steel pipe development.
(2) straight seam submerged arc welded steel pipe
Longitudinal submerged arc welded steel pipe is reliable and widely used for oil and gas high pressure transmission main line. Longitudinal submerged arc welding in China is the late development of advanced pipe technology, in the past mainly using UOE technology manufacturing, in recent years progressive JCOE in China and the world has gradually become another new mainstream technology. The welded pipe unit investment is relatively large, the use of raw materials for the high cost of the leaflets wide plate, the process is more complex, low production efficiency, higher product costs. As a result, the technology is constrained by the quality of raw materials, the price and the cost of the system, and is not competitive in general applications.

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