ERW steel pipe industry trends

 As an important part of the steel pipe steel products, play a significant role in national economic development, due to its manufacturing process and used in tube shape divided into seamless steel pipe, straight seam steel pipe, spiral welded pipe (SSAW), straight seam welded steel pipe is divided high-frequency straight seam welded steel pipe (ERW), large-caliber LSAW pipe (LSAW). Total current trends of the world steel industry is: welded steel pipe production grew faster than the growth rate of seamless steel pipe; welded steel pipe production proportionally much larger than seamless steel tubes; seamless compete in all areas of the market; in welded steel tube in, ERW welded steel pipes in the production dominate, but within the Oil and gas pipeline areas use city gas pipeline LSAW and SSAW pipes for the market.
Welded steel pipe technology development is accompanied by a seamless steel pipe products and competition and progress. Welded steel pipes in some areas should gradually replace the seamless steel pipe, the key lies in the quality and lower production costs. Improve the quality of welded steel pipe products mainly rely on technological progress in three areas. First, iron and steel smelting technology, the second is to improve the hot strip technology, the third is to improve the steel pipe manufacturing technology.
In Nippon Steel, JFE, Manlesiman, test Ritz (Greece), represented by straight seam welded steel pipe production equipment and production technology has made rapid development. New row roll forming, developing URD fine molding machines and sizing machines, high-frequency welding equipment and welding technology, weld heat treatment equipment and technology, nondestructive testing, and other new technologies, the straight seam welded steel pipe has been used in the offshore oil and gas transportation, onshore oil and gas transmission pipe has been widely use. Especially in recent years, X80 grade line pipe and OCTG T.U.F the advent of the straight seam welded steel pipe application opens up a wide range of fields.
In Western countries, efforts to broaden the field of use ERW welded steel pipe, as the representative of the United States of North America to focus on the development ERW OCTG range of applications in the 1980s has been widely used ERW casing in 3000m deep wells, modern and developed a coiled tubing etc; in Europe, especially Germany, focusing on the development of boiler tubes range of applications, ERW welded steel pipe production in low-pressure boiler pipe applications are common, accounting for more than half of the total boiler tubes, high-pressure boiler tubes can also use part of ERW welded steel pipe. Asia, Japan, South Korea, represented almost fully developed ERW welded steel pipes range of applications, South Korea, accounting for more than 98% of the welded steel pipe steel country's total output, while ERW welded steel pipe and welded steel pipe more than 90% of total production; Japan since the welding the rapid decline in steel production technology advances and costs, and gradually replace part of seamless and welded steel pipe UOE, (the Japanese do not use oil and gas transportation spiral, using only UOE pipe), especially with the gas pipeline of high-strength requirements of small caliber and thinner, but also expanded the scope of application of ERW welded steel pipe. ERW pipe has been used for deep, sulfur wells, low temperature (cold) wells and certain high anti-squeeze tube wells, and deep seabed oil and gas pipelines with the delivery. Currently, Japan's JFE Steel's Chita plant large ERW unit has become the world's only produce diameter 26 inches (φ660mm) line pipe straight seam high frequency welded steel pipe production line, the product of the unit up to X70 grade steel line pipe, anti overall performance HIC and SSC, etc., have been used in the North Sea pipeline, now being developed X80 grade steel products. Chita factory founded in 2003 by 26 inches ERW production unit wall thickness of 25.4mm φ660mm welded steel pipe, which not only expanded the range of plant species, but also easier to replace oil and gas for delivery UOE steel pipe used in construction and for free pipe joints, due to the increased wall thickness, pressure-resistant breaking characteristics are improved to 1.6 times the original, and comprehensive testing done checking thick-walled tube, to achieve world-class level.
At present, foreign high-frequency welded steel pipe product specifications, medium and large diameter of a certain proportion, therefore, the proportion of foreign oil and gas pipelines (including city gas) ERW welded steel pipe with larger accounts.
The proportion of high frequency welded pipe mill in the world situation
At present, foreign steel:
- Welded steel pipe production accounts for about 70% of world steel production;
--ERW Welded steel pipe production accounts for about 80 percent of the world's total output of welded steel pipe;
--ERW Oil casing production accounts for about 40 percent of the world's total oil casing;
Length --ERW line pipe accounts for about 50% of world output of oil and gas pipelines the total length of the year;
From the development of foreign ERW welded steel pipe, we can draw the following revelation:
--ERW Welded steel pipe seamless market on the one hand to the edge portion of the core of the development; ERW welded steel pipes to the oil and gas on the other hand the long pipeline of small diameter submerged arc welded pipe market development;
--ERW Existence and development of welded steel pipe and seamless steel pipe, spiral welded pipe has a close relationship, both on the tube play to their strengths, thereby forming a competitive state; but also due to the characteristics of each tube to form a complementary coexistence.

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