The derusting method method of ERW steel pipe

In the oil and gas pipeline corrosion in the construction process, straight seam steel pipe anti-corrosion surface treatment is to determine the life of one of the key factors, it is ERW steel pipe coating with the premise of whether the combined firm. The study of professional organizations, in addition to the life of the coating depends on coating type, coating quality and construction of environmental factors, ERW steel pipe coating surface treatment of life-span of about 50%, therefore, should be strictly in accordance with corrosion layer specification for ERW steel pipe surface, continually improve the surface treatment straight seam steel pipe, ERW steel pipe in addition to embroidery methods are mainly the following:

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How to identify the quality of spiral steel pipe?

Spiral steel pipe used in the production and often there will be some quality problems, in some respects that affect the normal use, the need for the identification of quality spiral steel pipe, according to certain methods and performance testing, can have important practical use in the role, then how to identify counterfeit spiral steel pipe approach: the appearance of the phenomenon often Pock. Generally speaking, commensurate with the amount of whole would be better, mainly taking into account the accumulated error and probability theory this problem. Any inadequacies in the above points please add, we welcome the knowledge to discuss the steel in the continuous exchange in progress. Ma rolling groove surface is due to severe wear and tear caused by uneven irregular spiral steel pipe surface defects. Spiral steel pipe manufacturers as inferior to the pursuit of profit, most often excessive rolling rolling groove. Easy to produce surface scarring.

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Spiral steel pipe experiment inspection

From the welding process, the spiral seam steel pipe and welding straight line, but inevitably there will be a lot of Longitudinal T-weld, so the probability of the existence of welding defects has greatly improved, and T-welds the weld large residual stress, weld metal are often in three dimensional stress state, increasing the possibility of cracks.

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How to install pump spiral pipe?

With the continuous progress of science and technology and market demand. Pump Bu original rubber hose used has been eliminated. Instead, high quality, low cost, light weight plastic spiral. Buy a new spiral pipe diameter and pump size connector is very close, so security is more difficult to access. Many users use the water hot, with fire, but the right way is difficult to work. There is an effective way: first to take to a 1 kg bags filled with empty bottles of pesticides in the bottle top coated with oil or butter, then hand always has rotating spiral roasted on the fire burn until the spiral grill soft, coated with a lubricant to the glass inside the coil support (depending on the depth of the pump connector length of stay may be), then remove the glass, then into the pump connector On cooling coil plastic spiral soon after the contraction, this pump connector was firmly wrapped in a spiral, even when not on the package will not take off the hoop.

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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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