Langfang DingYang

Blanking and Defects of National Standard Stainless Steel Flange

fittingflange | 30 January, 2019 09:34

Stainless steel flange is a kind of flange, which is widely used and popularized in the mechanical industry, and has been praised and favored by users. Rolled flange is widely used, and its scope of use is determined according to different characteristics. It is mostly used in mild medium conditions, such as low-pressure non-purified compressed air and low-pressure circulating water. Its advantage is that the price is relatively cheap. Rolled flange is suitable for nominal pressure not more than 2. 5 MPa steel pipe connection, the sealing surface of rolled flange can be made into smooth type, concave-convex type and mortise-groove type. Smooth rolled flange is widely used. The other two kinds of rolled flange are also common in use. The rolled flange includes many types and models. The butt-welded steel flange is used for butt welding of flange and tube, mainly in welding technology, and has good performance. Its structure is reasonable, its strength and stiffness are large. It has high temperature, high pressure, repeated bending and temperature fluctuation. Its sealing performance is reliable. The rolled flange with nominal pressure of 0.25-2.5 MPa adopts concave-convex sealing surface. The processing of stainless steel flange needs to know and pay attention to some problems: 1. Weld defect: The weld defect of stainless steel flange is serious. If manual mechanical grinding is used to remedy it, the grinding trace will cause uneven surface, which will affect the beauty. 2. Non-uniform passivation of grinding and polishing: After manual grinding and polishing, acid pickling and passivation treatment is carried out. It is difficult to achieve uniform and uniform treatment effect for large workpieces, and the ideal uniform surface can not be obtained. There are also its shortcomings, such as the cost of working hours and accessories. 3. Scratches are difficult to remove: integral pickling and passivation, chemical or electrochemical corrosion will occur in the presence of corrosive media, and impurities such as carbon steel and splash adhering to stainless steel surface due to scratches and welding splash can not be removed. So how to solve the problem of stainless steel flange processing? 1. Choose blanking, after completion, enter the next process, different stainless steel workpieces according to the processing requirements into the corresponding process; 2. When bending, first of all, according to the size of the drawing, the thickness of stainless 304 seamless steel pipe should determine the tool and groove used in bending. Avoiding the deformation caused by the collision between the product and the tool is the key to the selection of the upper die (in the same product, different types of upper die may be used), and the selection of the lower die should be determined according to the thickness of the plate. 3. In order to solder firmly, punching bumps on the workpiece to be soldered can make bumps contact with the plate uniformly before electrified welding, so as to ensure the consistency of heating at all points. At the same time, the welding position can be determined. Welding needs to be done. It is necessary to adjust the pre-pressing time, the holding time, the holding time and the resting time to ensure that the workpiece can solder firmly by spot welding. In the process of using stainless steel flange, leakage occurs because of improper connection of stainless steel flange or long service life. Users need not panic when this happens. First, look at the leakage site. It is impossible to inject sealant through the gap to eliminate leakage at the leakage site because of the minimum gap. Sealing construction method is based on the site survey of the leakage site to achieve limited sealing. Fixed fixture method is used to contain leaking points to form sealing chamber and inject sealant to eliminate leaking. Fixtures on one side are customized. Fixtures should satisfy the leaking point. In order to prevent potential leaking of valve body and carbon steel flange clearance due to pressure, annular cavity is installed at the joint of fixture and flange outer edge of valve body. Fixtures with different diameter stainless steel flange tend to be smaller in the process of injecting agent. The displacement occurs on the side of radial flange, so the restriction measure of tooth contact clamping is adopted. After solidification of the sealant during operation, after observation of the effect, local reinjection and compression are carried out to prevent stress relaxation, and then the injection hole is sealed.

Stainless Steel Pipe Fittings Play an Important Role in Daily Life

fittingflange | 21 January, 2019 14:35

In the interior decoration project, the proportion of water pipe is very small, regardless of material consumption or price, but once the water pipe has problems, the consequences will be very serious, so it is very important to choose reliable, stable, convenient maintenance, healthy and environmental protection water pipe. Since the 21st century, due to the improvement of living standards, more than 30% of the residents in China need high-grade water pipes to meet the needs of their high-quality life. As a result, high-quality stainless steel materials from high-end tableware to household water pipes. It has become a trend to select high quality thin-walled stainless steel pipes in tooling or household decoration projects. Thin-walled stainless steel pipe and stainless steel pipe parts will become an indispensable part of the future building materials market. Stainless steel is recognized as a kind of health material that can be implanted into human body. It has been many years since stainless steel was used to make water pipes in developed countries. Thin-walled stainless steel pipes have gradually become a new choice of water supply pipes due to their safety, reliability, sanitation, environmental protection and economic applicability, and have become the current world trend and development direction. Stainless steel pipes are called the real green pipes in the 21st century. With the development of national economy and the improvement of people's living standards, people pay more and more attention to the health and environmental protection of domestic water. A good water source pipeline has become a prudent choice. Water pipes generally go through the development process of lead pipes copper pipes iron pipes galvanized iron pipes plastic pipes stainless steel pipes. Choosing high quality stainless steel malleable iron pipe fitting as water supply pipe has become a trend in the world. The data show that in Germany, more than 80% of the residents choose stainless steel pipes; in Japan, more than 85% of the residents in Tokyo use stainless steel pipes; in Australia, they have begun to replace other pipes with stainless steel pipes; in the United States, all the pipes of five-star hotels in Las Vegas use stainless steel materials.

Advantages of Stainless Steel Elbows and Their Cleaning and Installation

fittingflange | 07 January, 2019 17:57

What are the advantages of stainless steel elbows When installing stainless steel elbows, attention should be paid to the sealing, so as to prevent leakage and affect the normal operation of pipelines. Generally, it can be installed in any position of the pipeline, but it needs to be easy to operate the inspection, pay attention to cut-off stainless steel elbow media flow should be upward under the control valve disc, stainless steel elbow can only be installed horizontally. Ball valves, globe valves and gate valves with stainless steel elbows are used only for full opening or full closure, and flow regulation is not allowed, so as to avoid erosion of the sealing surface and accelerate wear and tear. There is an inverted sealing device in the gate valve and the upper thread globe valve, and the handwheel is rotated to the top to be welcomed by users. The main difference between stainless steel butt weld elbow and carbon steel butt weld elbow is the difference of material. The chemical composition of stainless steel elbow will maintain the important performance and operation value of elbow in practical use. There are many things to be noticed when using and maintaining stainless steel elbows. Users need to use them in a certain way and use and maintain them in an accurate and fair way. Stainless steel elbows do not produce corrosion, pitting, rust or wear. Stainless steel is still one of the most powerful building metal materials. Because stainless steel has good corrosion resistance, it can make structural parts permanent to maintain the integrity of Engineering design. Stamping elbow of stainless steel containing chromium is also a combination of mechanical strength and high extensibility. It is easy to process and manufacture parts and meets the needs of architects and structural designers. The welding rod used in stainless steel elbow should be kept dry when used. The Ti-Ca type should be dried for 1 hour at 150 C. The low hydrogen type should be dried for 1 hour at 200-250 C. (The coating can not be repeatedly dried, otherwise it is easy to crack and peel off), so as to prevent sticking oil and other dirt on the coating, so as to avoid increasing the carbon content of the weld and affecting the quality of the weld.

What Are The Technological Properties and Requirements of Flange Forging?

fittingflange | 03 January, 2019 13:34

With the rapid development of industry, more and more arts and crafts appear in our life. We all know that forging is a processing technology. Speaking of forging technology, flange forging technology must be one of them. It occupies a great position in flange forging technology, but you should not know what the process of the production of blue forging technology is, right? The technological process includes heat treatment method and hardness value, cleaning method and requirement of surface oxide scale, allowable value of local coarsening of forging rod, Standard Code of tolerance and dimension precision grade or specific tolerance value for the dimension tolerance of the forging not specified. Compared with the advanced technology abroad, the forging flange industry in our country still has a big gap, and there are still some shortcomings in terms of variety, specification, function and quality. Moreover, there are some important mainframes or fields in our country, such as civil aviation aircraft, high-speed railway passenger cars, high-grade cars, computers, air conditioners, imported major equipment and so on. With the development of the times, many industries have their own development technology. Speaking of these industries, we are familiar with them. In recent years, many new processing methods have appeared in our common processing industries. For example, the forging industry that we can come into contact with can be regarded as one of the best. There are many things we need to know when we use these forging processes, among which alloy steel flanges forging is one of the most commonly used ones. Let's have a brief look at its technological requirements. When using steel plate or section steel, the following requirements must be met: steel plate should be inspected by ultrasonic wave without delamination defect; the butt weld of ring should be heat treated after welding, and 100% ray or ultrasonic inspection should be done, and the ray inspection meets the grade II requirements of JB4730, and the ultrasonic inspection meets the grade I requirements of JB4730. It should be cut into strips along the rolling direction of the steel, welded into rings by bending and butt welding, and make the surface of the steel to form a cylindrical surface of the rings. No steel plate can be directly machined into necked flange. The calculation method of flange (suitable for large and small apertures with smaller difference in size and larger fan radius): According to the diameter and height of the aperture, the taper oblique length (i.e. the fan radius) can be calculated, then the fan angle can be calculated according to the fan radius and arc length (which can be circumference or half circumference, etc.), and then the tangent length can be calculated according to the angle and radius, and then the tangent can be divided into several equal parts according to the actual needs. Dimensions from different equivalents to tangents are then connected point by point. Stainless steel flange has good pressure resistance, good temperature and pressure resistance, good flexibility and heat resistance, and its advantages are much better than other plastic pipes. Stainless steel flanges are easy to install and have good thermal conductivity. They are suitable for floor heating systems. Flanged pipes have excellent impact strength. They can be welded and mechanically connected, and have excellent heat conductivity. Stainless steel flange is made of steel plate. After cutting the steel plate into material according to the requirements, it is punched into a circle by punching die. Two halves are then joined and welded. After pushing, the flange should be shaped in this hot state. Stainless steel flange has more flaw detection and heat treatment processes than other forged pipe fittings in the manufacturing process. When using steel plate or section steel, the following requirements must be met: steel plate should be inspected by ultrasonic wave without delamination defect; the butt weld of the ring should be heat treated after welding and 100% ray or ultrasonic inspection, and the ray inspection meets the requirements of JB4730 Grade II. It should be cut into strips along the rolling direction of the steel, welded into rings by bending, and made the surface of the steel into a cylinder of the ring.

How About The Corrosion Resistance of Seamless Carbon Steel Elbows?

fittingflange | 02 January, 2019 10:57

The pipe fittings are stamped into semi-annular elbows with high quality steel sheet by stamping die or cast directly into semi-annular elbows by casting die. Then two semi-annular elbows are welded in groups. Carbon steel elbows are resistant to weak corrosive media such as air, steam and water and chemical corrosive media such as acid, alkali and salt. The corrosion resistance of seamless carbon steel elbow is also very strong, not only will it not rust, but also will not breed bacteria, except for a few hydrogenating agents. Because of their differences in chemical composition, the former is not necessarily resistant to chemical erosion, while the latter is generally stainless. Soft-sealed butterfly valves are generally used on concave-convex flange sealing surfaces. Mengcun forged pipe fitting in the installation should pay attention to the sealing, to prevent leakage, affecting the normal operation of the pipeline. The improvement of carbon steel elbow not only increases the service life of carbon steel elbow, but also improves its working performance, so as to better connect pipelines, so that its compressive capacity will be enhanced a lot. Butt welding of annular workpieces such as automobile rim and bicycle, motorcycle rim, various chain rings, etc. The quality of high-pressure elbow is not only the quality of elbow, but also the packaging of high-pressure elbow. However, PEX can not be recycled and secondary pollution will occur; the development trend of seamless elbow pipe materials: seamless elbow raw materials not only have qualified creep rupture curve, but also have moderate pipe prices, construction is relatively convenient and fast compared with other varieties, the connection form belongs to the most reliable standard interfusion hot-melt connection at this stage, the hole diameter of pipe parts is larger than the inner diameter of the same specification pipe, in the system. Because there is no mechanical connection with local diameter reduction, the fluid resistance of the system is relatively small. During transportation, it should not be impacted or rained to prevent rust and oxidation. Carbon steel butt welded elbows are suitable for pipeline systems in petroleum, natural gas, chemical, hydropower, construction and boiler industries. If the carbon steel elbow is not treated by the above methods, in order to maximize the integrity of the carbon steel elbow, it is necessary to keep the carbon steel elbow dry and ventilated, keep the retainer clean and tidy, and store it in accordance with the correct storage method. Otherwise, the front-end outside diameter is usually large or small after the push head, which needs to be shaped by the shaping die.

How Does The Pure Zinc Coating of Galvanized Pipe Crystallize?

fittingflange | 30 December, 2018 10:34

The surface condition of the plated workpiece is very important for the quality of hot-dip galvanizing. In order to obtain a good galvanizing coating, it is necessary to treat the surface of the workpiece seriously, which is the necessary condition to ensure the effect of the whole process. In the electroplating operation, even if the grease scale and oxide scale on the surface of the workpiece are not cleaned up, the zinc coating may still deposit on it. Of course, the interlayer between the coating and the iron base may form, leading to bad conditions such as peeling, foaming or speckles. In hot-dip galvanizing, if the surface of the workpiece is not cleaned thoroughly, the adhesion of the zinc layer will be hindered. This situation, in which no zinc can be plated on the workpiece, is called "zinc deficiency" in hot-dip galvanizing. If the surface of the plated workpiece is rough and uneven, although it does not affect the hot-dip galvanizing work, but the silver out of the workpiece is also rough, uneven, of course, not bright. The corrosion resistance of rough galvanized coating is lower than that of flat and smooth galvanized coating. Obviously, the rough galvanized coating can not achieve the ideal anticorrosive and decorative purposes. Therefore, before hot-dip galvanizing, it is necessary to clean the workpiece as cleanly as possible by mechanical or chemical methods to meet the requirement of surface smoothness for hot-dip galvanizing. Hot-dip galvanizing is simpler than galvanizing for surface treatment of workpiece. Because machined parts can be directly hot-dipped without pre-plating treatment. For the workpieces processed by other methods, only chemical treatment is needed; for the workpieces formed by casting, mechanical treatment is needed. In hot-dip catalpa plating process, the residual oil, oil film and other organic matter on the surface of the workpiece during the processing do not hinder galvanizing, because these substances are burned or volatilized due to the high temperature during galvanizing. The main factors affecting the quality of hot-dip galvanizing are oxide scale and iron sulfide layer on the surface of the workpiece. As for the thinner rust, it will not have a great impact on the hot-dip galvanizing construction. Nevertheless, the pretreatment of hot-dip galvanizing should not be neglected. Because the quality of the workpiece before plating determines the quality of the whole hot-dip plating process. There are two stages in the process of metal crystallization: nucleation and growth. That is to say, the nucleus with a certain size is formed in the liquid first, and then the liquid atoms around the nucleus are continuously condensed on the nucleus, which makes the nucleus grow into a grain. When the temperature of liquid metal drops below the solidification point, there are more embryos in the liquid, but whether it can grow to a certain size and become nucleus is affected by various external factors. The number of nuclei determines the size of crystalline grains after crystallization. The more nuclei, the more grains, but the smaller the size. The ways to form nuclei are as follows: First, the impurities attached to the surface of steel strip, such as iron powder, oil residue, alkali stain, etc. The nuclei formed by these ways are often not ideal, resulting in uneven zinc flowers or poor zinc plating. Secondly, the protrusion attached to the surface of the steel strip is the reason why the surface roughness of the steel strip affects the size of the zinc spark. If the surface roughness of the original plate is human, the zinc spark is smaller. Third, the lower temperature in the coating. If there is no external core in the coating, the undercooling of the coating will increase. From the microscopic point of view, the phenomenon of temperature inhomogeneity in the liquid will increase, that is, the temperature fluctuation will increase, and the lower temperature will be conducive to the formation of crystalline core. Comparing these three ways, the first two ways are easier to nucleate, but the adhesion of the coating is poor. The third crystallization rate is the slowest and the most ideal crystallization state. The coating after crystallization has strong adhesion and good uniformity of zinc flower. With nuclei in the coating, it is very easy for the nuclei to grow up to crystallize completely. With the decrease of temperature, liquid atoms continuously gather on the nuclei and grow up according to certain rules. Finally, all the liquids are transformed into solids, and the whole crystallization process is completed. The final result is that a crystal nucleates into a grain, which is a zinc flower. In fact, the so-called large zinc flower, small zinc flower and zinc-free flower are just the number and size of grains. At the junction of zinc flowers, i.e. grain boundaries, the atomic arrangement is irregular. During crystallization, some alloy elements and impurities that are insoluble in the coatings will be driven to this place. The aggregation formed at the grain boundaries is called intergranular segregation, so the corrosion usually begins at the grain boundaries. The larger the grain size, the more obvious the segregation and the greater the influence.

What Is The Main Function of Stainless Steel Tee?

fittingflange | 25 December, 2018 14:57

The tee is pipe fittings and pipe connectors. Also known as pipe fittings tee or tee fittings, tee joints, used in the main pipeline branch. Three-way is a kind of chemical pipe fittings with three openings, one inlet and two outlets, or two imports and one outlet. It has T-shaped and Y-shaped, equal-diameter and different-diameter pipe openings, which are used at the confluence of three identical or different pipelines. The main function of the tee is to change the direction of the fluid. Stainless steel tees are butt welded pipe fittings and pipe connectors. It is used in the branch of main pipeline. Stainless steel tees are divided into equal diameter and different diameter, and the nozzle ends of equal diameter tees are the same size; the nozzle sizes of different diameter tees are the same, while the nozzle sizes of branch pipes are smaller than the nozzle sizes of the main pipe. Stainless steel tee is a kind of pipe fittings used in branch of pipeline. For the manufacture of tees with seamless tube, there are two kinds of technology commonly used at present: hydraulic bulging and hot pressing. Hydraulic bulging of stainless steel tee is a forming process of expanding branch pipe by axial compensation of metal material. The process is to use a special hydraulic press to inject liquid into the billet with the same diameter of the tee. The billet is extruded synchronously through two horizontal side cylinders of the hydraulic press. The volume of the billet decreases after extrusion. The liquid in the billet increases with the volume of the billet. When the pressure required for the expansion of the stainless steel tee branch pipe is reached, the metal material is pressed in the side cylinder and the billet. Under the double action of force, the branch pipe expands along the inner cavity of the die. The hydraulic bulging process of stainless steel butt welded tee can be formed at one time, and the production efficiency is high. The thickness of the main pipe and shoulder of stainless steel tee increases. Stainless steel tees are often used in the branch of pipeline. Generally, stainless steel tees are made by seamless pipe technology, mainly by hydraulic and hot pressing. Among them, hydraulic bulging of stainless steel tee is a forming technology of expanding branch pipes with axial compensation of metal materials. In the whole manufacturing process, a professional hydraulic press is used. This machine can inject the tubes with equal diameter into liquid and form stainless steel tee through a series of processes. The manufacturing method has the advantages of high efficiency, one-time forming and high safety. Because the hydraulic bulging process of stainless steel tees requires a large tonnage of equipment, it is mainly used in the manufacture of stainless steel tees with standard wall thickness less than DN400 in China. The suitable forming materials are low carbon steel, low alloy steel and stainless steel with relatively low tendency of cold work hardening, including some non-ferrous metal materials, such as copper, aluminium and titanium.

What Are The Factors AffectingThe Price of Metal Fittings?

fittingflange | 21 December, 2018 16:05

Almost every household has to use metal malleable iron fittings . It is true that the types of these products are different and the use environment is also quite different. But I believe consumers are more willing to buy high-quality pipe fittings. After all, these products need to be used for a long time. If problems arise, they may cause unnecessary trouble. Although metal fittings are relatively small in size and may not require a large amount of each household, the overall price will still have a large gap. So what are the factors that affect the unit price of metal pipe? forged fitting , want to engage in long-term sales of this kind of products, then mainly directly find manufacturers, can guarantee the low price and quality of products. If the individual purchases metal fittings, they are basically purchased through the store, and the price will be slightly higher, but because we buy a small number, so the unit price will be slightly higher, which is also recognized by consumers. The third factor is the quality of products. In fact, the price of metal fittings is still affected by the quality. Better quality metal fittings can be calculated purely from the cost price, so there will never be an ultra-low sale. Even if we buy products directly through the manufacturer, there will not be an ultra-low price situation, after all, the manufacturer also needs to ensure their profits. So if you want to buy better quality products, do not choose some clearance or ultra-low price metal pipe fittings, so we must pay special attention to price issues, cost-effective products are our first choice. We can also send some samples directly to the other manufacturer, which can guarantee the quality of their products. The fourth factor is the quantity of after-sales service and purchase. Generally speaking, there will be no serious problems with metal fittings. If the quality problems can be returned directly, it is better to sign a contract with them. The other side's factory will also act according to the contract to ensure our interests. And the merchants who can provide after-sales service or promise to help us exchange goods for free are absolutely our best choice, and their fees will inevitably be slightly higher. Now large pipe fitting manufacturers will provide relevant after-sales service, after all, we need to continue to cooperate for a long time, so we need to compare their oral commitments, which can be implemented into the contract or agreement. If you buy more products in batches and pay for them in one lump sum, you can also guarantee their low prices.

What Kinds of Forging Flange Can Be Divided Into?

fittingflange | 20 December, 2018 11:15

Flat-welded flange has poor rigidity, which is suitable for pressure P <4 butt-welded flange is also called high neck which has high rigidity and is suitable for high pressure and temperature there are three types of href="http://www.fittingflange.com/product-category/stainless-steel-flange/">stainless steel flange sealing surface: flat sealing surface, which is suitable for situations with low pressure and non-toxic medium; concave and convex sealing surface, which is suitable for situations with slightly higher pressure; mortise sealing surface, which is suitable for situations with flammable, explosive, toxic medium and high pressure. Gasket is a kind of ring made of material which can produce plastic deformation and has certain strength. Most gaskets are cut from non-metallic sheets or made by professional factories according to specified sizes. The materials of gaskets are asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc. There are also metal-clad gaskets made by wrapping asbestos and other non-metallic materials with thin metal sheets (white iron sheets, stainless steel). Flat welding flange forging can be divided into free forging, upsetting, extrusion, die forging, closed die forging, closed upsetting. Closed die forging and closed upsetting have high material utilization rate because they have no flying edge. It is possible to finish complex forgings with one or more processes. Because there is no flying edge, the force area of the forging decreases and the load required decreases. However, it should be noted that the blank can not be completely limited, so the volume of the blank should be strictly controlled, the relative position of the forging die should be controlled, and the forging parts should be measured, so as to reduce the wear of the forging die. The main functions of flat welded flange are as follows: 1. Connect the pipeline and keep the pipeline in good sealing performance. 2. If there is a problem in a certain section of pipeline, it is convenient to replace a certain section of pipeline. 3. Pipeline failure, easy to disassemble and detect. If flange surface is flange, it is the connection fittings of metal pipeline. It is welded vertically at the end of the pipeline. After the two flanges are aligned, they are connected together by bolts and caps, and the pipelines are connected together. The stainless steel weld neck flange surface can connect the pipeline in use and ensure the normal connection and unimpeded of the pipeline. It plays an important role and value. The diaphragm beam is a structure in which the inner part of the box girder (or T girder) is perpendicular to the box (or beam) and plays a connecting and reinforcing role. The diaphragm beam of the box girder is poured together with the box girder. A part of the diaphragm beam of the T girder is poured together with the T girder. After the T girder is hoisted and put in place, the adjacent T girder is pre-welded and the formwork is cast in place.

Standard Stainless Steel Elbow National Standard Various Non-standard Products

fittingflange | 19 December, 2018 09:20

When the arc-starting section of high-pressure stainless steel elbow is a butt weld of stainless steel pipe fittings , these changing external loads will cause the weld to be in a complex stress state, seriously weaken the strength of the weld, reduce the working capacity of the stainless steel pipe fittings of high-pressure elbow, and shorten the service life of the high-pressure elbow. It is conducive to weld joint docking, high-pressure elbow manufacturer to improve the quality of weld joint, improve the service life of high-pressure elbow. The material of high-pressure stainless steel elbow is special. Cut-off valves remove the oxide scales on the inner and outer surfaces of the pre-welded tiles, and store them neatly in the ventilated and dry places in the room. Wear-resistant materials account for about half of the total. Avoid storing foods that are too acidic or too alkaline. Standard stainless steel elbows with large and small heads are the national standard, American standard, British standard and various non-standard products. It is often used in the case that the temperature and pressure of medium are not high and the corrosiveness of medium is strong. The material for making seamless stainless steel butt welded elbow is stainless steel elbow round billet with good mechanical properties; eliminating or greatly saving metal consumption of stainless steel elbow and riser in pouring system is so novel due to terrain limitation, as long as it is properly placed, the time is about 10 minutes, it is easy to produce hot cracks.

Processing Method of Welded Steel Pipe Interface for Pipe Fittings

fittingflange | 18 December, 2018 14:24

Welded steel pipes for low-pressure fluid transportation and the treatment method of malleable iron pipe fittings welded pipe interface are made of carbon and low carbon steel. It is the most commonly used pipe material for small-diameter pipeline engineering. It is suitable for water, natural gas, steam, etc. According to its surface quality, it can be divided into carbon steel galvanized pipes (commonly known as galvanized iron pipes) and galvanized pipes (commonly known as black pipes). The dielectric ceramic fragments along the flow direction are also designed to cut into the same shape as the elbow, so that each circle of the ceramic piece is close and there is no gap. It has become one of the most widely used wear-resistant materials, with a market share of about 80% of the world's special ceramics (wear-resistant materials). This combined sensor is not only necessary for the production of large diameter pipe elbow push system, but also very effective for the production of stainless steel elbow. The import price of Elbow push system is now falling, which has become the "burden" of enterprises'own Elbow push system. Corrosion test data show that the service life of stainless steel elbow can reach 100 years, and stainless steel elbow hardly needs maintenance. Therefore, its cost-effective, low operating cost and remarkable economic benefits. Compared with the "cross cutting" type of multiple seams, the welding seam is less important, and there is no corrosion of the front seam, and the subsequent flushing, the corrosion situation is better.

Production Technology of Alloy Steel Flange

fittingflange | 13 December, 2018 16:25

Before the production of aluminium alloy steel flange , according to the size of the drawings, a rigorous and meticulous calculation and analysis were carried out to obtain the corresponding theoretical weight of the flange. Finally, the following technological route was adopted: cutting - - - electric furnace heating - - - forging - - - melting - - - forming - - - lathe processing - - - finished products. 1. Casting is the first process in the production of aluminium pipe fittings . A. Ingredients: According to the specific alloy grades produced according to the needs, the amount of additions of various alloy components can be calculated, and various raw materials can be rationally matched. B. Melting: The raw materials are added to the smelting furnace to melt according to the technological requirements, and the impurities and gases in the melt are effectively removed by means of degassing and slag removal refining. C. Zirconium casting: The melted liquid aluminium is cooled and cast into round rods of various specifications under certain casting conditions through deep well casting system. 2. Extrusion: Extrusion is the means of forming profiles. First, the die is designed and manufactured according to the section of profiles. The heated round casting rod is extruded from the die by extrusion. 3. Coloring. A. Surface pretreatment: Clean the profile surface by chemical or physical methods, expose the pure matrix, in order to obtain a complete and compact artificial oxide film. Mirror or matte surfaces can also be obtained by mechanical means. B. Anodic oxidation: A dense, porous and strong adsorptive layer of AL203 film is formed on the surface of the profile after surface pretreatment under certain technological conditions. C. Sealing: The pore of porous oxide film formed after anodic oxidation is sealed to enhance the anti-pollution, anti-corrosion and wear resistance of the oxide film. The oxide film is colorless and transparent. It can absorb and deposit some metal salts in the pore of the film by using the strong adsorption of the oxide film before sealing. Many colors other than the true color can be displayed on the surface of the profile.

Different Parts Can Play an Important Role

fittingflange | 11 December, 2018 13:34

In the production process of our various mechanical products, various parts can also play a very important role. Flange, as a connecting part between pipe and pipe, and valve, can always bring us a very considerable connection effect. It connects nuts through the holes on it, and then adds them. The use of upper gasket guarantees the closeness of the connection to the greatest extent, and also brings us convenient operation mode. The flange manufacturer, through the distinction of different materials, as well as providing comprehensive, meets the use requirements of our new type of pipe fittings and equipment market. Our customers should pay attention to that carbon steel flange can play an important role in our pipeline connection process. At the same time, the connection way it can create for us has also been recognized by each of our users and friends. The product types he brings to us are divided into different material types, and also have a life. According to the division of production process, high pressure flange has super high specification requirements for pipeline pressure. As long as we can ensure its quality, we can obtain convenient use conditions, reduce the occurrence of the whole product failure, and increase the utilization rate of our products. For welding flange, when we connect, we must have a clear understanding of the welding technology we have mastered. Only in this way can we make the whole product play its most dynamic effect and bring us a more common way of use. These are all the things that we all need to pay attention to. Good product quality assurance can create more space for us to use, can let us each user's needs, get the best supply, in addition, we have to do a good job of maintenance and maintenance, reduce leakage and leakage.

What Are The Factors Affecting The Performance of Large Flanges

fittingflange | 07 December, 2018 16:27

In the production of large flanges, there are many factors affecting the performance of large flanges. Let's talk about the following common factors: first, annealing temperature (annealing temperature is the temperature parameter when primers and templates are combined, and when 50% of primers and complementary sequences are double-stranded DNA molecules, it is the temperature that affects the specificity of PCR. Factors. Ideally, the annealing temperature is low enough to ensure the effective annealing of primers with the same target sequence, and high enough to reduce non-specific binding. Reasonable annealing temperature ranges from 55 to 70 C. The annealing temperature is generally set to be 5 C lower than the Tm of the primer. Whether the required temperature is reached or not. Large stainless steel flange is usually treated by solid solution heat treatment, which is commonly known as "annealing", the temperature range is 1040 ~ 1120 ("Japanese standard"). You can also observe through the annealing furnace observation hole that the large flanged pipes in the annealing zone should be incandescent, but there is no softening sag. Second, the sealability of the furnace body (the shell is welded by steel plate and section steel, the trolley is welded by section steel and steel plate, and the trolley reduces the heat radiation and convection loss by soft contact with the lining and sand sealing mechanism, thus effectively ensuring the sealability of the furnace body). Bright annealing furnace should be closed, isolated from the outside air; hydrogen as protective gas, only one exhaust port is open (used to ignite the exhaust hydrogen). Soap water can be used to smear the cracks in each joint of the annealing furnace to see if it runs out. The most easily runs out is the place where the annealing furnace enters and leaves the tube. The sealing rings in this place are particularly easy to wear and tear, so it is necessary to check and replace them frequently. Third, the protective pressure. In order to prevent micro-leakage, the protective gas in the furnace should maintain a certain positive pressure. If it is hydrogen protective gas, the general requirement is more than 20 kBar. Annealing atmosphere: Pure hydrogen is generally used as annealing atmosphere. The purity of the atmosphere is better than 99.99%. If the other part of the atmosphere is inert gas, the purity can also be lower, but absolutely can not contain excessive oxygen and water vapor.

Flange Connections Are Simpler

fittingflange | 21 November, 2018 14:52

As long as we understand the current industry, people will find that in such an industry, we still need to use some related equipment, including the connection between the axis and the axis, but how to complete such a connection, we need to use it at this time. Such parts as alloy steel flanges , so that the connection between the pipe ends can be well realized. It can be said that now such parts can be well used for the connection between some pipe ends, or for the connection between two devices, and become the connection parts that will be used in many industries. It is precisely because of the emergence of such spare parts, so now people in the connection between related equipment, but also completely do not have to worry about the connection problem. And most importantly, since the emergence of such connecting parts, there have been a variety of different parts. According to the standards of the chemical industry, it can be divided into threaded, integral flanged connecting threaded pipe fittings . According to the present machinery industry, it can be divided into related connecting fittings of plate balance. Therefore, the application of different industries, but also can be better applied in different industries, has become a large number of industries will be widely used in the connection of forged pipe fittings . For all industries now, such flange can also become an indispensable part of the industry. It is believed that after having such connection fittings, there is no need to worry about any problems in connection.
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