China's LSAW steel pipe mill is showing the characteristics of overcapacity and centralized layout.
As the research statistic shows, there are total 25 sets of domestic LSAW steel pipe UOE / JCOE units, with a total production of 5.43 million tons. At present, there are two characteristics of China's LSAW steel pipe UOE / JCOE unit:
1. overcapacity. China's oil and gas pipeline market mainly includes three parts: one is the Oil and Gas Pipeline oil system, the annual demand of about 3 million tons; the second one is the export market, the annual demand of about 2 million tons; the third one is city gas pipelines and around the city's liaison with the mainline branch, the annual demand of about 3 million tons. Annual demand on the oil and gas pipeline home and abroad totaled 8,000,000 tons. But the production of large diameter spiral submerged arc welded pipe line pipe capacity of approximately 6 million tons, plus UOE / JCOE straight seam submerged arc welded pipe mill capacity (5.43 million tons) to reach a total of more than 1100 tons, thus, overcapacity of 300 million tons.
2. too dense layout in the Yangtze River Delta region. There are three sets of UOE / JCOE unit in Shanghai, respectively, Baoshan Iron & Steel Co., Ltd., Shanghai Tianbao Pipe Company and Shanghai monthly tide Pipe Company; there are seven sets of JCOE unit in Jiangsu, namely Guangzhou Panyu Zhujiang Steel Pipe (Jiangyin), Bohai Petroleum Equipment Nanjing Julong steel Pipe Company, Wuxi, Jiangsu Yulong Steel Pipe company (three sets of units), Yangzhou Yalian steel pipe Company and Zhangjiagang sand Jinzhou pipeline Limited; there are ten sets of UOE / JCOE units in the Yangtze River Delta region, total capacity of 2.13 million tons,, which is accounting for 40% of the country SAWL unit analysis by the unit, and accounting for 39 percent of domestic energy according to production statistics.
Wednesday, November 12, 2014
New materials developed to improve the corrosion resistance of carbon steel pipe
With the rapid development of the coastal petrochemical and power industries, the application of using seawater to replace the increasingly tense freshwater as industrial cooling medium can save a lot of fresh water resources, and get access to obtain significant economic and social benefits. However, due to the strong corrosion resistance of seawater, when using ordinary carbon steel or stainless steel tubes, water as the cooling medium will cause serious corrosion of the tube bundle, which can significantly reduce the life of the heat exchanger. This not only increases the number of replacement equipment, but also because of equipment failure causing equipment downtime too often and making the economic benefits reduced.
Under normal circumstances, to solve this problem, the pipe need to be done material upgrading, and upgrade materials mainly uses copper-nickel alloy and titanium tubes. Due to the high production cost of titanium tubes, it is difficult to be accepted by many users to, and copper-nickel alloy may cause corrosion due to serious pollution of seawater.
For the heat exchanger, its development has been largely relying on the adoption of the new material. Under many occasions, serious corrosion appears, the measures mainly adopted are:one surface corrosion, two is the choice of the new corrosion resistant material. The corrosion current application of new materials is mainly titanium tube, Hastelloy, super duplex stainless steel, zirconium tubes. These materials have good corrosion resistance, but their common drawback is the device cost is too high, so that the general business is difficult to accept.
To solve the practical problems, there are companies combining the carbon steel pipe, stainless steel pipe with relatively low cost materials and thin-walled titanium tubes with strong corrosion resistance together, being applied to heat exchange equipment, and developed the desired anti-corrosion effect, the manufacturing cost is relatively low (+20 titanium steel, titanium and titanium tube was 40% + austenitic stainless steel, pure titanium pipe of 60%) and the use of the same performance and titanium tube heat exchanger tube bundle successfully. Compared with ordinary carbon steel pipe, has the following outstanding advantages:
(1) The superior corrosion resistance. In the medium offshore seawater heat exchanger tube bundle, the corrosion resistance of titanium tube is incomparable to any other pipe, composite pipe is the use of titanium tubes to achieve the advantages of corrosion-resistant, easy to scale, easy to plug, sea easy attachment of biological effects.
(2) reduce the cost of anti-corrosion materials. Composite pipe heat exchanger using thin-walled titanium tube bundles to meet corrosion requirements and use steel or stainless steel as the strength of the body, to the use of titanium tube heat exchanger effectiveness and cost much less than the latter.
(3) reduce maintenance costs. In the heat transfer area 700m2 meter under the same conditions, a flat carbon steel tubes annual maintenance cost of about 40,000 yuan, while the composite tube bundle corrosion maintenance cost is almost zero.
(4) extend the service life. Common organic preservative bundle the general life of 1 to 2 years, and titanium composite tube bundle life of over 10 years.
(5) conservation of freshwater resources to reduce overall energy consumption. Social and economic benefits using seawater were significantly higher than fresh water. Because seawater is lower than the ambient temperature 6 ~ 10 ℃, while circulating the water temperature higher than the ambient temperature is 3 ~ 5 ℃, the temperature difference between the two composite above 10 ℃, and the overall cost of the circulating water system is much higher than seawater. Meanwhile, since the surface of the circulating water will produce microbial attachment bundle and fouling can reduce heat transfer efficiency, and the titanium composite pipe can be effectively prevented in order to avoid adhesion of microorganisms to reduce heat transfer efficiency.
Under normal circumstances, to solve this problem, the pipe need to be done material upgrading, and upgrade materials mainly uses copper-nickel alloy and titanium tubes. Due to the high production cost of titanium tubes, it is difficult to be accepted by many users to, and copper-nickel alloy may cause corrosion due to serious pollution of seawater.
For the heat exchanger, its development has been largely relying on the adoption of the new material. Under many occasions, serious corrosion appears, the measures mainly adopted are:one surface corrosion, two is the choice of the new corrosion resistant material. The corrosion current application of new materials is mainly titanium tube, Hastelloy, super duplex stainless steel, zirconium tubes. These materials have good corrosion resistance, but their common drawback is the device cost is too high, so that the general business is difficult to accept.
To solve the practical problems, there are companies combining the carbon steel pipe, stainless steel pipe with relatively low cost materials and thin-walled titanium tubes with strong corrosion resistance together, being applied to heat exchange equipment, and developed the desired anti-corrosion effect, the manufacturing cost is relatively low (+20 titanium steel, titanium and titanium tube was 40% + austenitic stainless steel, pure titanium pipe of 60%) and the use of the same performance and titanium tube heat exchanger tube bundle successfully. Compared with ordinary carbon steel pipe, has the following outstanding advantages:
(1) The superior corrosion resistance. In the medium offshore seawater heat exchanger tube bundle, the corrosion resistance of titanium tube is incomparable to any other pipe, composite pipe is the use of titanium tubes to achieve the advantages of corrosion-resistant, easy to scale, easy to plug, sea easy attachment of biological effects.
(2) reduce the cost of anti-corrosion materials. Composite pipe heat exchanger using thin-walled titanium tube bundles to meet corrosion requirements and use steel or stainless steel as the strength of the body, to the use of titanium tube heat exchanger effectiveness and cost much less than the latter.
(3) reduce maintenance costs. In the heat transfer area 700m2 meter under the same conditions, a flat carbon steel tubes annual maintenance cost of about 40,000 yuan, while the composite tube bundle corrosion maintenance cost is almost zero.
(4) extend the service life. Common organic preservative bundle the general life of 1 to 2 years, and titanium composite tube bundle life of over 10 years.
(5) conservation of freshwater resources to reduce overall energy consumption. Social and economic benefits using seawater were significantly higher than fresh water. Because seawater is lower than the ambient temperature 6 ~ 10 ℃, while circulating the water temperature higher than the ambient temperature is 3 ~ 5 ℃, the temperature difference between the two composite above 10 ℃, and the overall cost of the circulating water system is much higher than seawater. Meanwhile, since the surface of the circulating water will produce microbial attachment bundle and fouling can reduce heat transfer efficiency, and the titanium composite pipe can be effectively prevented in order to avoid adhesion of microorganisms to reduce heat transfer efficiency.
Tuesday, November 11, 2014
LSAW pipelines construction of China's "twelve five"
Currently, the world oil and gas transporting line has reached 260 million meters, which natural gas pipeline accounts for about 60 percent. Since the 1990s, the world's annual new built gas pipeline 1.2 million meters to 1.6 million meters, new built base oil pipeline of 0.2 million meters to 0.3 million meters. Before the "Twelve Five", China has built a oil and gas main pipeline of 7.5 million meters, which accounts for about 50 percent of natural gas trunk; China is expected to newly build oil and gas main lines of about 5 million meters of to 6 million meters during the "twelve five" period, among of which natural gas pipeline accounts for about 50 % and the above.
Foreign gas transmission (including city gas pipeline network branch, main line and urban ring main line) mainly uses the LSAW steel pipe, less use of SSAW steel pipe. Our natural gas project in 1 class areas (desert, mountains and other sparsely populated areas) is with spiral submerged arc welded steel pipe, in two, three, four areas (industrial zones, urban and densely populated areas, etc.) is with LSAW steel pipe or ERW steel pipe (HFW). In the West-East Gas Pipeline Project, due to the high requirements of pipeline transport pressure (12MPa), high grade steel (X80), large diameter (ф1219mm) and wall thickness (≥18mm), LSAW steel pipe increasingly showing its superiority. Upon the completion of the construction of the West-East Pipeline Project in China, foreign single-tube gas transmission lines of transmission capacity has reached 46 billion cubic meters - 50 billion cubic meters / year, while China can only reach 30 billion cubic meters / year. However, if the pipeline across the board is replaced by the ф1420mm, X80 grade LSAW steel pipe, then the country's single-tube gas transmission capacity will reach 50 billion cubic meters / year advanced level.
High level JCOE unit in China
High level JCOE unit is more suitable for the development trends of large diameter LSAW steel pipe.
In China, there are three main sources of UOE unit: the first is the introduction of foreign modern units, such as Baosteel's UOE unit; the second is the introduction of foreign second-hand equipment UOE units, such as the Shanghai Tianbao Pipe Company and Guangzhou Panyu Zhujiang Steel Pipe Company crew; the third is domestic UOE units, such as Liaoyang Steel Tube Co. unit. Among them, Baosteel UOE units is imported from Germany, with a total investment of over 30 billion yuan, reaching world-class level, in 2008 the commissioning year provided the 100,000 tons of ф1219mm × (21mm ~ 27mm) X80 grade line pipe for the West-East Gas Pipeline Project, so far as estimated total production of 322,000 tons line pipe for the West-East Gas pipeline Project; and in the year 2010 ~ 2011, winning its products in Queensland, Australia gas pipeline project, the production of steel grade X70, ф1067mm × (14.1mm, 18mm, 23.5mm) of a total of 210,000 tons of line pipe. And for other steel companies mainly introduce UOE unit used equipment, or choose the domestic unit, with lower investment costs, which is also of great help to support the market of LSAW steel pipe production
In China, there are three main sources of UOE unit: the first is the introduction of foreign modern units, such as Baosteel's UOE unit; the second is the introduction of foreign second-hand equipment UOE units, such as the Shanghai Tianbao Pipe Company and Guangzhou Panyu Zhujiang Steel Pipe Company crew; the third is domestic UOE units, such as Liaoyang Steel Tube Co. unit. Among them, Baosteel UOE units is imported from Germany, with a total investment of over 30 billion yuan, reaching world-class level, in 2008 the commissioning year provided the 100,000 tons of ф1219mm × (21mm ~ 27mm) X80 grade line pipe for the West-East Gas Pipeline Project, so far as estimated total production of 322,000 tons line pipe for the West-East Gas pipeline Project; and in the year 2010 ~ 2011, winning its products in Queensland, Australia gas pipeline project, the production of steel grade X70, ф1067mm × (14.1mm, 18mm, 23.5mm) of a total of 210,000 tons of line pipe. And for other steel companies mainly introduce UOE unit used equipment, or choose the domestic unit, with lower investment costs, which is also of great help to support the market of LSAW steel pipe production
Monday, November 10, 2014
How to get rid of the overcapacity problem of steel pipe
As we all know, how to solve the problem of overcapacity in China lies in the decisive role of market to the allocation of resources. Here, the key is technological innovation and product innovation. At present, the steel industry, including the SSAW steel pipe, LSAW steel pipe, ERW steel pipe and so on, is also facing the situation of serious homogeneity, lack of high-end products, the low-end product surplus. For example, high-grade X100 steel strip products and welded steel pipe products are still in the trial stage, 70% steel of marine engineering relies on imports, nuclear power plants also rely on some high grade steel products imports. Therefore, it is not saying there is no market demand for steel products, but the product cannot meet the market demand. Moreover, not only there are the needs of high-end products, the low-end products, general products have market demand also. The key is to help the corporate make brands, and products to be professional and qualified. Ordinary products also need to insist the style of professionalism and high quality. Because diversity is for enterprises, professionalism and quality is in terms of the production line. Only stable, reliable, durable, and quickly production of marketable products can improve the efficiency of enterprises.
At the same time, to achieve technological innovation, it is necessary to strengthen the combination of the research and the production. Emphasizing the applications and users, highlighting business-oriented, market-guided style.
At the same time, to achieve technological innovation, it is necessary to strengthen the combination of the research and the production. Emphasizing the applications and users, highlighting business-oriented, market-guided style.
What is Q460E
Q460E high-frequency welded steel pipe is a high-strength low-alloy structural steel pipe, with the characteristic of high strength, low temperature and strong impact toughness, the manufacturing process is more difficult. In recent years, China has overcome a number of technical problems, broken through the barrier of high-grade high-frequency welded pipe products under low temperature impact toughness is difficult to achieve high quality standards and unstable weld quality, which helps to obstacles to new product -40 ° C to reach the weld impact energy greater than average level of 100 joules, fully meet the requirements of an average of not less than 34 joules actual project proposed, and the other physical and chemical properties are in full compliance with the relevant standards and special technical requirements. The products have a bright future in the cold northern and southern power grids recent snow disaster-prone, UHV transmission line construction and construction steel structure areas with special requirements.
Sunday, November 9, 2014
What kind of common pseudo defects may appear in the weld seam inspection of LSAW steel pipe
Common pseudo defect wave in the weld inspection of lsaw steel pipe
1, the instrument clutter: when the instrument is connected to the probe, due to poor performance of the instrument, the sensitivity is set too high, unimodal or multimodal waveform appears on the screen, while when the probe is connected for work, the position of the wave on the screen is fixed. Under normal circumstances, once reducing the sensitivity, the signal disappears.
2, the probe clutter: when the instrument is connected to the probe, a very high pulse amplitude, very broad signal is shown on the screen, regardless of whether the probe contacts the workpiece, it is there and the location is not moving with the probe.
3, coupling agents reflected wave: If the refraction angle of probe is large, and the detection sensitivity is high, then part of these will be converted to the surface wave, this wave is propagated to the forefront of the probe where the coupling agent is accumulated, causing the reflected signal. As long as the probe is fixed, with the loss of coupling agent, the amplitude is slowly decreased and very unstable. If wipe the coupling agent in front of the probe by hand, the signal will disappear.
4, the groove weld surface reflected wave: the trench is formed in the multi-pass welding weld surface. When the ultrasonic sweep the trench, the trench will cause reflection. Identification method: generally lie in the first, secondary wave or slantly behind position, and the characteristic of this reflected signal is not strongly and obtuse.
5,the reflected wave caused by the weld dislocation: as welding seam dislocation, in the first test, the reflected wave is much like the fillet weld defects within, when the probe is moved to the other side of the detection, there is no reflected wave in a wavefront or horizontal distance measured of the probe is in the weld base metal.
1, the instrument clutter: when the instrument is connected to the probe, due to poor performance of the instrument, the sensitivity is set too high, unimodal or multimodal waveform appears on the screen, while when the probe is connected for work, the position of the wave on the screen is fixed. Under normal circumstances, once reducing the sensitivity, the signal disappears.
2, the probe clutter: when the instrument is connected to the probe, a very high pulse amplitude, very broad signal is shown on the screen, regardless of whether the probe contacts the workpiece, it is there and the location is not moving with the probe.
3, coupling agents reflected wave: If the refraction angle of probe is large, and the detection sensitivity is high, then part of these will be converted to the surface wave, this wave is propagated to the forefront of the probe where the coupling agent is accumulated, causing the reflected signal. As long as the probe is fixed, with the loss of coupling agent, the amplitude is slowly decreased and very unstable. If wipe the coupling agent in front of the probe by hand, the signal will disappear.
4, the groove weld surface reflected wave: the trench is formed in the multi-pass welding weld surface. When the ultrasonic sweep the trench, the trench will cause reflection. Identification method: generally lie in the first, secondary wave or slantly behind position, and the characteristic of this reflected signal is not strongly and obtuse.
5,the reflected wave caused by the weld dislocation: as welding seam dislocation, in the first test, the reflected wave is much like the fillet weld defects within, when the probe is moved to the other side of the detection, there is no reflected wave in a wavefront or horizontal distance measured of the probe is in the weld base metal.
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