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When selecting a flange connection with fastener materials stainless steel flange, pipeline operating pressure, operating temperature ought to be considered at the same time, medium type and gasket type and other factors. Gasket type and operating pressure, operating temperature, directly to the fastener material strength requirements are put forward. For example, the spiral wound gasket seal of low toxic medium pipeline flange connection, although the pipeline operation pressure and temperature is not high, but because of the spiral wound gasket needed to form the initial seal than pressure, and fasteners to bear load is big, therefore, in this case requires fasteners with high strength alloy steel materials. Alloy steel stud shall adopt high quality steel. The material mark after all should add letters A, such as 35 crmoa, 25 crmova according to different structure, the bolt can be pided into hexagon head bolts and stud (also known as the stud) two kinds, the stud is pided into two kinds of harness and the harness. Hexagon head bolts: often used with flat welding flange and non-metallic gaskets with milder conditions for operation. Commonly used material is BL3 or hex head bolt is Q235B; Stud: often used with butt welding flange at the operating condition is harsh working conditions, among them, because there is no cross section shape on the harness type stud, so its bearing capacity is strong. Rather than type harness stud is relatively weak bearing capacity. Nut materials often according to and cooperate with bolt material, these combinations have provisions in the general standard. Under normal circumstances, the nut material should be slightly below the bolt, and ensure the nut hardness is lower than bolt hardness HB30 around.

Outlet flange in the country, it is better to open an effective way to the flange of the market. But face it, although Chinese exporters in this respect has done a lot of hard work, but the prospects for export flange, it is not very optimistic. So what hinders the road outlet flange do, where we make a brief introduction: First, the rise in raw materials is the direct cause obstruction outlet flange, at present, we can say the price of the raw material has been produced flanges in a rising trend, many manufacturers affected by this, the only constant outlet flange raise prices , will win some profits. But the face of the international market, which existed for serious competition, manufacturers in the similar imported products, to ensure the quality of the case, of course, to the price-based, and this respect for Chinese exporters is very unfavorable . Second, the competition more intense and exporting countries. Currently, the flange of production is mainly concentrated in developed countries, such as India or South Korea. These countries produce flanges advantage of the situation than, for example, is rich in raw materials, the value of labor is relatively low, and so on. So these countries on the production of the flange has become China’s production of flange manufacturers the most direct rival. And in general, our country is weak. Third, management of most enterprises do not pay attention flange outlet flange work. This occurs because of one of these manufacturers understand that in this regard our country and there is no obvious advantage, in order to occupy the international market is not an easy thing. Second, ideas relatively conservative leaders of these companies, not actively fight for the right to import and export flange products. In China only a few manufacturers through the ISO9000 international quality system certification. So in this regard, our country is the initiative to abandon the international market situation. Fourth, even though they have achieved export qualified flange manufacturing enterprises, because in management, backward, export flange in the international competitiveness is also at a disadvantage. It should be said outlet flange of these enterprises, in production operations and management, logistics management, even with the production site management, in addition to their existing operational experience in doing outside, did not meet scientific operation and management, This relatively prone to problems affecting the flange of this commodity in the international competitiveness.

Many stainless steel flange type now used. Integral stainless steel flange and the container or pipe it is often a whole. Looper stainless steel flanges just loose tube flange or flange soil, so called free stainless steel flanges. Looper stainless steel flanges straight search Chou said not connected to the container or takeover. This connection method can not reach the same intensity integral connection. Looper stainless steel flanges for small-sized more occasions. In order to save the whole stainless steel to stainless steel flange for improper use of non-ferrous metals “such as aluminum, nausea, etc.) 10 metal” under plastic, inside porcelain) occasions, Looper stainless steel flange has relatively extensive use of. In any form, also known as any love in the form of stainless steel flange stainless steel flange. Stainless steel circular flange machined groove, set in the English or other components. Then then the two are welded together. The forces between its overall stainless steel flange and stainless steel flange Looper general, overall resistance than stainless steel flanges, stainless steel flanges but stronger than the word sets. Forging flange product is a product in the best mechanical properties, its raw material is generally tube, and then again after the cutting for continuous beat, in order to eliminate the ingot segregation, porosity and other defects. Prices and mechanical properties than conventional cast flange high a grade. Tube and pipe flanges are so interconnected parts and valves connected to the pipe end; also useful for equipment import and export on the flange for connection between the two devices is to make pipes and tubes of interconnected parts, connected the pipe end. A pipeline accessories product. Forging flange main materials are carbon steel, alloy steel, stainless steel. The main standards GB, electricity standard, American Standard, the German standard, Japanese standard and so on. The main anti-corrosion treatment have oiled and galvanized. Forging flange pressure, temperature performance is better, generally applicable to high pressure and temperature of the working environment.

Stainless steel flange is also called the loose flange, rotating with flange. The inner diameter of the butt welding flanges shall be in accordance with the connection pipe diameter, but with the pipe connection on both sides of the fillet weld; Due to the combined with flanging tube joint, and cheaper prices. If the inside and outside welding, pressure or temperature fluctuations of pipeline or high temperature, high pressure and piping of sub-zero temperatures, flange set outside the flanging pipe joint; In order to avoid because of the flange joint leakage or damage can lead to bad consequences, its advantage is flange can rotate, but not easy to welding, general and flanging tube joint combination. Combined, such as the cost of raw materials and construction costs, there is a seam on the back of the flange, butt weld stainless steel flange bolt hole easily. Less important on the pipeline, pipe flange flanging activities can also be applied to need frequent disassembly for cleaning or inspection, due to thermal expansion pipe or other load and make the stress of the flange of the larger or stress changes repeatedly, its diameter should be consistent with pipe diameter, easy to leak. Should not be used in place of temperature fluctuation repeatedly. But for your pipes in particular, on the spot annealing is difficult, therefore. Butt welding flange can also be used to deal with expensive, inflammable, explosive fluid; If the inside welded again on one can avoid the corrosion, stainless steel flange when using this kind of flange. Socket welding flange its basic shape the same as the flat welding flange, flange and pipe connection in the form of butt welding, welding, thread, socket welding and flanging activity type (also called loose flange), etc; Stainless steel flange easier due to the pressure fluctuations, temperature fluctuations, vibrations and shocks are not serious occasions during welding assembly line, or only when the alignment flange bolt holes in the rotation method Portland rather than the rotation of the tube. Calculated according to the internal pressure, generally used for pressure, low temperature, construction costs cheaper. Only 10% of the fatigue life of welded flange. Because in the vicinity of the welding flange. Welded flange for applications that require more severe cases, petrochemical enterprises in the process piping commonly used welding, than the same diameter. The use of large-diameter pipeline is easy to install, welded flange and other different flange that flange and pipe welding with a circle of high long and lean neck (neck). In the petrochemical business in public works mostly for the pipeline.

Flat welding flange is only applicable to pressure levels low stainless steel flange, threaded connections. The fatigue life of flat welding flange is only about a third of the butt welding flange, subjected to internal pressure and the performance of flat welding flange, stainless steel flat welding flange though the price is cheaper than stainless steel threaded flange. Easy to damage the flange surface and cause the deformation of the flange surface, cannot be used in under the action of alternating stress, stainless steel threaded flange is used in the occasion of galvanized steel pipe and cast iron flanges can’t welding. Stainless steel threaded flange this kind of flange is in the socket of flat welding flange pipe thread tube and pipe connection, the flange material does not necessarily consistent with pipes. One of the flange is fitting. So, this kind of flange. Therefore has been widely used, the thickness of the section of the high neck through the high neck gradually transition to the wall thickness, thus increasing the intensity of stainless steel threaded flange. Worse than butt welding flange, pipe material must be consistent with the pipe material. Not necessarily cheaper than butt welding flanges, generally used for small diameter pipe (() and the following. Welded tubes inserted into the flanges. Mainly used for connection of the pipe and pipe fittings, valves, equipment, fatigue strength 50% larger than flat welding flange, butt welding flange your of the same pressure temperature rating. Alloy steel flange has enough strength, stainless steel threaded flange can be used for high pressure conditions, due to the cheap material can use different material of flange. The gap between flange and pipe sometimes prone to corrosion; Hence reduces the discontinuity of stress, when using this kind of flange. The intensity of flat welding flange approximately two-thirds of the corresponding butt welding flange, pipe and flange pipe butt welding, such as. Static strength are the same. Also, instead of welding.

It is due to the use of stainless steel material production and become the widespread use of flange, so led to this kind of material in the supply of the flange it is good for the manufacturer to a message. Although the number of production is very important, but the importance of quality seems better, this requires manufacturers in the production of stainless steel flange well below these considerations, in order to guarantee the use effect. The first point, easy to avoid corrosion of stainless steel material For stainless steel the material on the surface of the the most important thing is to keep it clean, once after corrosion of the stainless steel surface will change the appearance, not so bright and clean. So all those who have the ability of stainless steel corrosion things will be far away from the production. Both acidic and alkaline gases or liquids are far away from the production environment. The second point, chosen the collocation of flange gasket The effect of flange connecting pipe above is indeed great, but little also not of gasket. A good helper in the collocation of use of stainless steel flange is asbestos gasket. Asbestos the material itself has very good properties, it can resist acid, either gas or liquid can be well absorbed by asbestos, so as not to affect the stainless steel. A little on special occasions, of course, also use other materials to the production of gaskets, this time to choose and with complementary ability of stainless steel gasket. The third point, to consider the connection flange production In there are different ways of connecting pipe, the pipe is thin can turn directly using the thread flange screw connection, some stainless steel flange facing some there is a big pressure pipeline, you will need to use to the welding, so that more solid and reliable. Material made of stainless steel flange still had better choose welding connection, both for the pipe pressure is big or small. Stainless steel welded connection is very convenient, is also easier. The diameter of the flange plate size, flange thickness is and will face the pressure of the pipeline is big or small. General situation, the more pressure big stainless steel flange thickness is also thick. If the pressure of the pipe is small, then a thin layer of stainless steel flange and disc can get different pipe connection problem. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

When countries facing the world opening, merchandise exports and imports has become one of the most common communication content. A lot of goods to the world have a better development, flange for this commodity is no exception. But this kind of goods for China, the market prospect is not optimistic, in the first is how export flange with overseas stock traders get close contact as soon as possible do a simple introduction: First of all, the exporter should pay attention to, not can use the way of writing or respects is the way to establish close contact with overseas suppliers. Because for merchants to import flange, received many letters every day, but in fact these letters tend to be handled with as rubbish. Because this way will waste precious time in the history of replenish onr’s stock, because these overseas stock traders like to use more direct and more convenient way. , of course, if there are any business urgently needs to find a partner, your way of writing are also likely to be successful, but the hope too slim. Second, most can communicate is set up for the market of the country for a friendly visit, and then to interview you want to establish business relations company. For the two cities went to Sydney or Melbourne goods access, usually in the area of outlet flange can have more chance to meet major importers. Need to do is to remind here, must make appointments before the meeting, this is also an aspect of etiquette. Once get the chance to meet the importer, the first to use the price of a product attract purchase business in Australia. Because of Australian businessmen don’t like to bargain, as long as they think the price is more appropriate, they will be willing to go to the next link exchanges. But it also from another side, let us know that all the businessmen care most about a problem is the price of the product. Once the commodity price recognised by the Australian businessman, they in the production process of suppliers after investigation, will decide whether place and merchants have long-term business relations. Finally, in terms of export flange. Exporters also note that if you want to get in touch with the importer with the fastest speed, the best way is to find a purchasing agent in country, because the importer and purchasing agent contact opportunities is more, once you find the importers to trust purchasing agent will make things more quickly.

Stainless steel pipe safety, health, environmental protection, economy applicable, piping of thin wall, and new methods for reliable, simple and convenient connection of successful development, make its have more other pipe irreplaceable advantages, the application of engineering will be more and more, use will be more and more popular, good prospect. Along with our country the implementation of the reform and opening up policy, the national economy to obtain rapid growth, urban housing, public buildings and tourist facilities built in great quantities, to the hot water supply and water supply is put forward new requirements. Water quality problems, in particular, people pay more and more attention to, also enhances unceasingly. Galvanized steel pipe a commonly used pipe corrosion because of its easy, under the influence of national policy, will gradually become relics, plastic pipe, compound pipe and copper pipe into pipe pipes that are widely used in the system. But in many cases, the stainless steel pipe has more advantages, especially the wall thickness of only 0.6 ~ 1.2 mm of thin-walled stainless steel pipe in high quality drinking water system, hot water system and water supply system will give top priority to safety, health, have a safe and reliable, health, environmental protection, economy applicable characteristics. Engineering at home and abroad has been proved to be the best comprehensive properties of feed water system, one of the new, energy saving and environmental protection of pipes, is also a kind of very competitive water supply pipe material, to improve water quality, improve the level of people’s life play a role of incomparable. In construction to the piping, the galvanization steel pipe is over one hundred years of glorious history, a variety of new plastic pipe and pipe to get rapid development, but a variety of pipe still exist some shortcomings in different degrees, is far from being fully meet the needs of the water supply system, the state of drinking water and related water quality requirements. As a result, experts predicted: building water supply pipe will eventually back to the time of metal tube. According to the application of foreign experience, in the metal tube that stainless steel pipe for comprehensive performance one of the best stainless steel pipe.

Flange is an industry often used in the field of fasteners, has extremely extensive application in various industries. As in recent years, with the increase of voltage level to double circuit transmission line tower, the four circuits and so on large-scale development. The traditional Angle steel tower already cannot satisfy the requirement of circuit design. In contrast, steel pipe tower is famous for its big stiffness, clear, and the advantages of small wind power transmission path, has been more and more widely used in the line iron tower. Commonly used steel pipe pole tower rigid flange connection and flexible connection points two kinds, they are mainly used for axial tension. Rigidity between refers to the flange plate of the flange and bolt along the direction of steel pipe set stiffening rib plate and formation of the flange with a stiffening plate. High rigid neck stainless steel flange with large stiffness and bearing capacity, the bolt force uniform, but in large Numbers in rigid flange welding operation will generate a large welding stress and welding deformation, and the setting of the stiffening plate also hindered the weld detection, quality control. For the convenience of flange manufacture and installation, to avoid a large number of welding operation, do not set stiffening plate between the flange plate and bolt, and directly by the steel pipe and flange plate welding of flange is called flexible flange. Flexible flange with concise and beautiful appearance, convenient manufacture and installation. Stainless steel flat welding and butt welding is refers to the flange and pipe connection way of welding, the flat welding flange welding with one-side welding does not need to welded pipe and flange connection inside the mouth, the welding of butt welding flange installation requires flange welding by both sides. So flat welding flange is generally used in low and medium pressure piping, used for medium and high pressure pipe butt welding flanges, butt welding of flange is usually at least PN2.5 MPa, the butt welding is to reduce the stress concentration, generally the butt welding of flange is bring more neck flange is also called the high neck flange. So butt welding flange installation cost, labor and auxiliary material cost is higher, because many procedures.

The material of stainless steel flange is according to the different models and different use, chemical composition and production. Stainless steel can be use, chemical composition and microstructure to general classification. By chemical composition: 1, the CR series: series of ferrite, column 2, CR – NI series markov system: system of austenite, abnormal series, series of precipitation hardening. Second, in the classification of the microstructure: 1, austenitic stainless steel 2,  ferritic stainless steel 3, martensite stainless steel 4,  precipitation hardening stainless steel 5,duplex stainless steel Third, there are several models: 1, good ductility, model 301 – used for forming products, also can rapid hardening by mechanical processing, good weldability, abrasion resistance and fatigue strength is better than that of 304 stainless steel. 2, model 302-304, corrosion resistance due to the carbon intensity of relatively high and better. 3, model 303 – by adding a small amount of sulfur and phosphorus from 304 are more likely to machining. 4, model 304 – gm model; The 18/8 stainless steel. GB brand of 0 cr18ni9. 5, model 309 – compared with 304 has better temperature resistance. After 6, model 316-304, the second is the most widely used types of stainless steel, mainly used in the food industry and surgical equipment, add molybdenum elements make it get a kind of corrosion resistant special structure. As compared with 304, it has a better ability to resist chloride corrosion and therefore as “Marine steel” to use. SS316 is usually used for nuclear fuel recycling equipment. 18/10 grade stainless steel usually also fits the application level. 7, model 321 – except for adding the titanium reduces the weld material corrosion risk besides other performance similar to 304. Series 400 – ferritic and martensitic stainless steel. 8, model 408 – heat and weak corrosion resistance, 11% of Cr, Ni 8%. Model 409 – the cheapest model (UK), usually used in automobile exhaust pipe, is a ferritic stainless steel (chrome steel). Model 410 – martensite chromium steel (high strength), good wear resistance, corrosion resistance is poor

Stainless steel flange often need to be flat heat seal, if there is no additional sealing pressure sealant in a separate area, affected by the pressure, will cause manufacturing inaccuracy or deformation, that is to say, in a separate area will appear leakage under pressure, pressure and unplanned repair. The current application in the field of high temperature plane sealing is good brocade high-temperature sealant, its special formula in the high temperature steam and gas turbine and the flange standard applications keep inert, so it can bear the hot air, steam, water, light fuel oil and lubricant, can be resistant to oil and gas. Stainless steel flange is one kind of one-component, paste sealants, industrial use, sealing compounds with high quality, suitable for smooth, level off sealing surface (butt joint) the condition of high temperature and pressure requirement. Using plaster knife or rubber scraper booth coating on the surface drying. Due to sealing products won’t cure, but its consistency will slightly change, maintain flexibility and elasticity, so no time requirements, the use finished, can immediately into the running, do not need to wait. Has the scratch if you want to repair the damage of high temperature sealing surface, should cooperate with high temperature F series using repair products. The corrosion of stainless steel flange, is usually characterized by the thinning of the wall of the stainless steel flange, a partial pits and pitting. Stainless steel flange corrosion detection method is the method of magnetic flux leakage and ultrasonic test. Magnetic flux leakage method, the basic principle of magnetic flux leakage method is based on the high permeability of the properties of ferromagnetic materials.

Stainless steel flange though a connection parts of a class is relatively small, but its role is immeasurable, pipeline engineering overall form without stainless steel flange play a powerful role. Stainless steel flange and stainless steel gasket for use in resistance to the increase in pressure effect is better. Material made of stainless steel gasket can also have a lot of modelling, some similar to the lens, also have a plenty of some irregular shape, the following will answer it for you stainless steel flange in some professional technical performance guarantee. First, the stainless steel flange connection is convenient Use made of stainless steel flange parts when the connection is the best choice is the way of welding. Here we call this kind of welding way plane welding, this is a kind of flange welding method is used, because it is flat so the operation is simple, as long as the two pieces of the flange alignment port for welding. For stainless steel flange welding, just have to make sure the pressure is less than, or equal to two point five mpa, within the scope of the pressure type using the carbon steel pipe connection is ok. Second, multiple connection methods all can use The method of flat welding flange persity, there are three main kinds of methods, they are smooth and flat, with concave and convex rolling plane, there is a mortise table plane, of course is the three welding sealing quality. The most used stainless steel flange welding method, is called a smooth surface of qingtian special welding way, it is also one of the most common in the middle of the pipeline engineering. Third, no matter what the environment can be used welding approach Pipeline engineering will face a variety of environmental characteristics, so the flange welding will need to adapt to the environment, whether mild or disasters. Generally to the places where environment is moderate, can use plane welding way. In such an environment of a number of factors can be stable, so is suitable for the welding of stainless steel flange. Smaller and there is no experience especially the pressure of air environment, the pressure is also a small circulation of water environment is also suitable for use. The welding of stainless steel flange on the price also is very easy to accept. Price advantage is to choose a very important reason of such a mode of welding, it also can reduce the cost of the project, the cost control in the lower position.