Weld pipe holes causes and prevention measures

Weld pipe vent pipe weld not only affect the density, resulting in leaking pipes, and corrosion-induced point will become a serious decrease weld strength and toughness.

Produce weld porosity of factors: the flux of water, dirt, oxide and iron, welding components and cover thickness, the surface quality of steel and steel side plate processing, welding and pipe forming process and so on.

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The application of ERW steel pipe

1. low pressure liquid delivery welded steel pipe (GB/T3092-1993), also known as general welded pipe, commonly known as the clarinet. Is used for conveying water, gas, air, oil and the general low-pressure steam heating fluid and welded steel tubes for other purposes. Then divided into ordinary steel pipe wall thickness and thicker steel; take over the side into the form without a steel tube (fluorescent tubes) and with a steel pipe. Steel pipe with nominal diameter size (mm) that the nominal diameter is the diameter of the approximation. Traditionally used in inches, such as 11 / 2 and so on. Low-pressure fluid used for welded steel pipe in addition to direct transmission fluid, but also a large number of low-pressure fluid used for welding galvanized steel pipe with the original tube.

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The scope of SAW spiral pipe

Double wire, spiral steel pipe(SSAW) is double-sided submerged arc welding arc welding under the flux layer method, the use of welding wire and flux in the solder layer between the arc produced under the burning heat flux and base metal melting metal wire to form. For the following reasons it is widely used in the production of large-diameter steel pipe:

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310S stainless steel high temperature

310S material (0cr25ni20) is an austenitic chromium-nickel stainless steel has good oxidation resistance, corrosion resistance, because a higher percentage of chromium and nickel, 310S non-standard thick-walled stainless steel tube / 2520 high temperature resistant stainless steel plate / 0cr25ni20 temperature stainless steel round bar has a much better creep strength at high temperature continuous operation, with good temperature resistance.
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Hot-rolled H-beam in the structure engineering

H-beam full name as "parallel wide flange I-beam", as used in our H-beam. People know very early on H-beam, but because of reasons of production technology, rolled H-beam only come out in 1902, much later than other sections, the construction industry in recent years as the world steel industry and the rapid development of the last 20 countries, especially in East Asia, Southeast Asia and built a six, seventy H-beam production line. Current world production capacity of about 3,000 tons. In developed countries, H-beam steel consumption in total consumption of about 4% to 6%, about half of total consumption profiles over and basically replaces the I-beam and H-beam welding.

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The application of rare earth in steelmaking

Rare earth application in steel, nearly 30-year history, after the role of rare earth metals in the steel and the mechanism of the law, find out the role of rare earths in steel; process method by adding the experimental study and master the earth to join process conditions, to add variety and add the amount of rare earth. The late 1980s, the application of rare earth in the steel has no technical barriers. Rare Earth in China's steel production from 11 million tons in 1985 to 1997, nearly 60 million tons, more than 80 varieties. Wuhan Iron and only one, "85" during the steel production of 160 tons of rare earth and create economic benefits 3.2 billion, social 1.83 billion yuan, foreign exchange savings of $ 50 million.

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Coiled tubing technology into the Chinese oil

Using horizontal well technology development oil and gas pipes, to improve well production and has become an effective means of recovery. At present, China has started large-scale onshore oil field application of horizontal wells, horizontal wells will be collected the next sea-oil primary means of land. The next few years, China's level of well workover and stimulation operations workload and job type will increase significantly. China's oil wells more than 800 last year's level, but the level of special casing wells, making conventional horizontal wells workover and stimulation, is difficult, inefficient, costly, prone to underground accidents. Coiled tubing technology to the level of well workover and stimulation, is conducive to the construction process simple and quick, safe and reliable, improve operational efficiency, reduce labor intensity and operating costs, reduce formation damage.

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Oil and gas pipeline welding

With the oil industry, oil and gas pipeline with its economic security, their professionalism, efficient and rapid development. Long-distance, large diameter, high pressure is becoming onshore oil and gas pipeline development, pipeline steel X56-X70 series of high-strength steel has been widely used in pipeline construction, X80 high
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The key issues of LSAW steel pipe anti-corrosion

LSAW steel pipe anti-corrosion key issues for the electrochemical corrosion of buried pipelines three processes, The anti-corrosion method of steel pipe from the start of a process in which inhibition. If the outer wall of the pipe plus anti-corrosion coating can increase the loop resistance and reduce corrosion current; external DC power supply, so that the soil pipe for causing negative potential, the formation of cathodic protection to eliminate potential difference between anode and cathode, anode fundamentally stop the process be. Anti-corrosion coating rule table, the cathodic protection of the rule of law. However, if the anti-corrosion coating damage, exposed iron parts will accelerate localized corrosion. Therefore, anti-corrosion coating and cathodic protection is a combination of methods to rid of this table, economical and effective. United States and other countries have clearly defined, using the anti-corrosion coating cathodic protection must be used.

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LSAW steel pipe features let it invincible position

LSAW steel pipe features: Longitudinal production process is simple. Low interest rates, rapid development. Plastic, spiral and standard classification: pressurized fluid transport spiral submerged arc welded pipe (SY5036-83 is mainly used for transporting oil, natural gas pipelines; pressure fluid transmission high-frequency welded spiral seam steel pipe (SY5038-83 lap welding method with high-frequency welding of the pressure fluid delivery for high-frequency welded spiral seam steel pipe steel tube strong pressure. to facilitate the welding and machining molding; generally low pressure liquid delivery spiral submerged arc welded pipe (SY5037-83 single-sided double-sided automatic submerged arc welding or welding into the legal system for water, gas, air and steam is generally low pressure liquid delivery such as submerged arc welding steel pipes In 2009, China's response to financial crisis, from time to time introduced the policy of economic comfort, steel users and traders of steel is expected to rebound in the market higher. all aspects of the survey show that the current inventory straight seam steel pipe not only restore the 2008 level, and on this basis, a further rise, "In 2009, the whole society of steel, Billet Straight seam steel pipe inventory increase equivalent to 30 million tons at present, social steel billet of high inventories, stabilize the steel market has been a threat to the Government issuing the credit limit the size of the steel industry, the credit crunch on the large steel straight seam steel pipe manufacturer impact limited little effect on steel prices.

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