Long and high diameter flange knowledge

Usually there are round holes on the flange to play a stable function, such as when the pipe connection is applied, the sealing ring is added in the middle of the two types of long and high diameter flanges

Then use bolts to tighten access, different pressure flanges have different thickness and application of different bolts, flange application of the key materials are carbon steel, stainless steel and alloy steel and so on.

In view of the key functions of long and high diameter flanges and excellent comprehensive performance, it is widely used in chemical plants, petrochemical plants, fire protection and drainage and other fields, and flanges are widely used as a connector internationally, which requires consistent specifications

For example, there are two key standard systems for pipe flanges at this stage, in addition to foreign JIS pipe flanges system, there are also steel pipe flanges system GB in China, but the key specifications are based on the European system and the American system.

In the process of manufacturing long and high diameter flanges, if there are quality problems, leakage will occur, resulting in property damage, environmental pollution and even safety risks

Therefore, the welding and manufacturing of flanges is very key, and the key of the production process of flanges at this stage is forging and casting, which are more suitable for long and high diameter flanges

The above is the knowledge and process description of the long and high diameter flange, and more knowledge about the flange, you can consult our customer service

We will have specialized personnel to answer your questions, you can also pay attention to our official website, we will update the knowledge of long and high diameter flange or carbon steel flange from time to time

Some friends are more curious about its molding process, so how does it have a flat and beautiful shape? Next, let’s talk about the casting method of carbon steel butt welding flange.

Carbon steel butt welding flange casting method

Butt welded flanges can also be called forged flanges, steam pipe flanges and plate butt welded flanges, used to connect carbon steel pipes, nominal pressure shall not exceed 2.5 mpa, butt welded flanges do not need to weld the hole in the pipe and the flange commonly used in low pressure and medium pressure pipes

According to the movement mode of forging die, the forging of butt welded flange can be divided into ring rolling, rotary forging and cross rolling. Precision forging can also use rotary forging and ring rolling. Some complex forging processes are completed by one or more processes to improve the utilization of heat treatment.

According to different casting methods, we can divide their forming process into two kinds of free forging and extrusion, the area of room temperature is not heated cold forging, the crystallization temperature area is called hot forging, low temperature forging on the welding flange, the change of forging size has little impact, forging below 700℃ will not decarbonize the surface of the flange

The advantage is that even if the forging force is small compared to the forging size, it can be formed. During the processing, the carbon steel butt welding flange will extend from near the die surface to the free surface, which is difficult to ensure accuracy.

Therefore, in order to better process the product, the direction of movement of the forging die and the rotating forging process are controlled by the computer.

In addition, it can also be used in some non-fixed areas, generally using steel rings to cover it at the end of the pipe, when the manufacturer leaves the factory, the expansion joint is designed at both ends of the carbon steel butt welding flange, and the direct contact between the pipe and the equipment is established with bolts

Butt welded flange not only saves space and weight, but also ensures that the joint does not leak, sealing performance is good, and then replace the flange gasket sealing ring, about explaining the casting method of carbon steel butt welded flange is explained here, what want to consult, you can call our Mingjian customer service phone, we will have special personnel to answer for you

Stainless steel flange sealing method

At the required connection interface, the connection of stainless steel flange, the case that the air pressure is not very large can use steel wire flange connection, the middle of the two stainless steel flange must be added gasket

Then in the use of bolts to tighten and stabilize, different pressure requirements of the flange, is not the same thickness and the use of different types of bolts, so what is the stainless steel flange sealing connection method, let’s take a look at it

The key to the stainless steel flange connection is the compact performance, the compact stainless steel flange not only saves the use of space, reduces the overall weight, so the size of the sealing member is reduced, so the whole is reduced

At present, it seems that the flange gasket has been replaced by the sealing ring to ensure the matching degree of the sealing surface relative to the sealing surface, so that in order to compact the cover only need less pressure, as the demand pressure is reduced, the size of the bolt and the number of demands are correspondingly reduced

Stainless steel flange is used for a long time or because of inaccurate use, resulting in rust, so the way to remove rust has these aspects

There are three aspects.we use special tools to remove the rust, and then use a scraper and a wire brush to remove the rust on the corners

If it is a small rust, we can remove it with a solvent or cleaning agent, use a clean rag to dip the solvent for cleaning and paint the primer in time and so on to remove the rust

Try to store the stainless steel flange in the vent, prohibit storage in a damp place, so as not to produce rust, damage the product itself, resulting in the product can not continue to use

Among them, the flat welded flange can be divided into neck flat welded flange and no neck flat welded flange. Due to the low neck height, the stiffness and bearing capacity of the neck welded flange are improved, and the on-site installation is more convenient and popular. Then do you know what parts are composed of neck welded flange? What is the working principle of flat welded flange with neck?

Working principle of flat welded flange with neck

The following Xiaobian I will briefly introduce it for everyone to understand, before understanding how it works, we first answer the previous question, that is, what parts it is composed of

The whole product comprises a flange with an inner hole in the center and a plurality of screw holes on the flange. One side of the flange is provided with a neck convex, the inner diameter of the neck convex is equal to the inner diameter of the inner hole and is connected with each other.

The other side of the flange has a circular depression, the center of which coincides with the central axis of the inner hole, and its radius is greater than the radius of the inner hole. It is precisely because of the structural characteristics of the neck flat welded flange (the overlap of the circular concave and the circular concave) that the neck flat welded flange is inserted into the inner hole of the tube body for lap welding.

The welding operation can make the pipe and the material between it form a weld, more firm and tight, thereby improving the welding stability between the pipe body, that is, the neck flat welding flange improves the strength and bearing capacity of the flange, and can be used for pipelines with higher pressure

However, there are some problems with the neck welding flange, that is, compared with the welding flange, the neck welding flange welding workload is large, the electrode consumption is high, can not withstand high temperature and pressure, repeated bending and temperature fluctuations, and compared with the flat welding flange, the cost is higher, because of its shape, it is easier to bump in the transportation process, this should be considered when selecting the neck flat welding flange.

Stainless steel flange aesthetics

Stainless steel flanges, as a key component of home decoration, will accompany buyers for decades. Especially in the case of severe homogeneity of industrial products, the selection of stainless steel flanges should pay more attention to the shape design of the product.

With the rapid progress of the period, the consumer audience is gradually younger, 85, 95 become the main consumer, the demand for stainless steel flanges will no longer adhere to anti-theft and wind and rain.

The acceptance of high-quality training of their pursuit of beauty is getting higher and higher, personalized free and easy, prompting them to become more and more high standards for stainless steel flange products.

In order to obtain greater profit in this serious market environment, it is necessary to grasp the market prospect and the appetite of buyers to change the product design and develop stainless steel flange products in line with the progress of the period.

At present, all major industries will have customized products, but also favored by buyers, in the case of severe product homogeneity, plagiarism and counterfeit products continue to appear, no one can see which products look good. The selection of stainless steel flanges manufacturers should also accept custom products, private customization is to create a unique product for the purchaser, the product design has a high stiffness standard.

Whether it is the change of the shape tone of the stainless steel flange, or the sufficient surface treatment technology, it should be personalized, and it should be different from the homogeneous products in the same industry, which can obtain the favor of a large number of buyers.

Then we also need to pay attention to not using hard things to hit the carbon steel flange itself, so the surface of the carbon steel flange will be scarred, in serious cases will destroy the sealing surface, so that the future sealing is unstable, affecting the use of even serious to replace the flange

Advantages of carbon steel flanges

Large carbon steel flanges should be based on the corresponding conditions and environment and the application characteristics and advantages of carbon steel flanges, for different application environments, play a key role in the application and construction and its value. If the application is not good, it is very easy to cause the flange produced by the flange manufacturer to crack.

In view of the need for pressure resistance, carbon steel flange butt welding flange has the characteristics of not easy deformation, good sealing effect and wide application field.

The flange has a more complex flared structure, its characteristic is the stiffness and elasticity in the comparison of the provisions, the effective butt welding thin joint, the weld avoids the joint surface.

Carbon steel flanges will have different application values in the application link, produce different types of functions and uses, large flange materials are not the same, and the production process is not the same. Therefore, it is necessary to pay attention to the method when processing large flanges, and it should be applied according to the corresponding process and its method

The above is some knowledge description of carbon steel flanges, want to know more knowledge of flanges, you can call the Haihao hotline, we will have special personnel to answer your questions, or pay attention to our official website, we will update the knowledge of the article from time to time

Characteristics of butt welded flange

Flanges with different pressures have different thicknesses and use different anchor bolts. Water pumps and valves, when connected with pipelines, parts of such devices and machines are also made into corresponding flange styles, also known as flange connections.

As long as the connecting parts are connected together with anchor bolts in the surrounding areas of the two plans, they are usually called “flanges”, such as the connection of ventilation pipes, this type of part can be called “flanged parts”.

However, this connection is only a part of the machine equipment, such as the connection of the flange and the pump, it is not good to call the pump “flange parts”. Relatively small such as valves, etc., can be called “flange parts”.

Butt welded flange is one of the most demanding flange products in the market. High pressure butt welding flange usually pressure level in the middle of 0.5 mpa -50 mpa, the structure of high pressure butt welding flange is divided into unit flange, whole flange, and insulation flange, according to the style of the flange surface can be divided into flange sealing surface: plan, concave, concave, tenon surface, ring connection surface.

The sealing of the butt welded flange is reliable, the function is high quality, and the appearance is good. Welding flange has the advantages of wear-resisting, heat resistance, corrosion resistance, abrasion resistance, long service life and so on

In view of the common impact strength function is significantly improved compared to the rest of the solid wall tube, its ring stiffness is equivalent to 1.2 times that of the solid wall tube. Under the additional use temperature and pressure, the service life of the pipe can be more than 50 years, with anti-ultraviolet light and anti-radiation, so that the product will never fade

What are the technical requirements of flange manufacturing

When manufacturing and manufacturing welded flanges, certain performance parameters and regulations should be selected for manufacturing and application to ensure that certain methods and fundamentals as well as certain processing methods and fundamentals can be applied and marketed. Are selected for manufacturing and welding, strictly ensure the excellent quality in the application.

The tilt of both sides of the head and neck of the butt welded flange must not exceed 7°. The performance parameters of butt flanges are strictly controlled during manufacturing and welding to ensure that efficiency and use value are fully utilized in manufacturing and application.

The demand for pipeline equipment continues to increase, which encourages the pipeline industry to continue to carry out technological innovation, with the continuous development of industrial production, the development of the molding process of pipe fittings has become crucial.

Processing carbon steel seamless elbow

In fact, the processing of carbon steel seamless elbows is generally based on product needs to select a suitable heating form, in other words, stamping forming, will be equipped with an inner core of the tube blank, immediately use the mold shell to carry out a type of stamping forming elbow

In the case of the preliminary processing of carbon steel seamless elbows, the stamping forming method completes the mass production processing of elbows, and is widely used in the processing of elbows.

Stamping has corresponding shortcomings, in the current stage of carbon steel seamless elbow processing, has been gradually replaced by the rest of the forming forms, but in the processing of some special size elbow, still choose the form of stamping

The forming quality of the elbow formed by stamping is not good, the wall thickness error of the carbon steel seamless elbow is large and the appearance of the molded elbow is not good, and the cost of the mold used is also very high when forming the excessively large size elbow.

Each form of molded carbon steel seamless elbow, although different in the scope of application and the quality of the molded elbow, has its own advantages in processing

When forming carbon steel seamless elbows, it is necessary to find out the forming form that can process the required qualified elbows faster according to the real situation today, which is used to ensure the fundamental processing benefits.

Welded stainless steel flange

The welding process includes welding, brazing, etc. The arc welding process of stainless steel flanges or other pipelines means that the arc can not directly point to the bellows, but is arc hot melt welding on the bellows.

The required materials should be prepared before the welding is performed. Remove oil and other dirt from stainless steel corrugated flange.

Assuming the welding process flange and leakage, the original welding process scars should be eliminated, the straight pipe of the flange should be polished and polished metal luster, the straight pipe of the bellows is too thin and can not be polished, ground and cleaned, and the light should be polished and polished with a manual emery cloth.

It is essential for the arc to travel through the flange tube. The arc refers to a very thick pipeline, the arc flame is used to heat the bellows, the edge of the bellows is blocked with welding wire, and the stainless steel welding wire is dissolved. Should be welded process thick wall pipe, select short welding or spot welding. In the welding process, the melting standard of the bellows should be consulted at any time.

Under normal circumstances, 1 time should melt 1 or 3 molten pools, so it is not suitable for 1 time 1 welding process. Especially in the case of large open space, it is very easy to burn through.

Pay attention to the processing points

When the stainless steel flange is welded, carbides will be precipitated by repeated heating, and the refracted carbides will reduce corrosion resistance and mechanical properties. Therefore, when welding stainless steel elbows, do not repeat heating to prevent carbides from affecting the corrosion resistance and mechanical properties of stainless steel elbows.

In order to prevent the corrosion between the eyes due to heating, the welding current should not be too large when welding stainless steel elbows, about 20% less than carbon steel welding rods, the arc should not be too long, the interlayer fast cooling, and the narrow weld pass is appropriate.

Therefore, when welding with stainless steel elbow electrode, it is necessary to reasonably control the welding current to prevent excessive current from producing eye corrosion, affecting the welding quality of stainless steel elbow. Considering its safety and service life, the focus is on improving the toughness, impact resistance, and wear resistance of the pipe lining

The acceptance of high-quality training of their pursuit of beauty is getting higher and higher, personalized free and easy, prompting them to become more and more high standards for stainless steel flange products.

Stainless steel flange machining again

In order to obtain greater profit in this serious market environment, it is necessary to grasp the market prospect and the appetite of buyers to change the product design and develop stainless steel flange products in line with the progress of the period.

At this stage, no matter what product, there will be unqualified defective products in the process of reproduction, stainless steel flange is the same, improper operation in the processing process, processing machinery failure, are there will lead to the processing of stainless steel flange defects

Common processing defects are unqualified weld processing, for unqualified defective products, will not be sold to customers, can only be processed again, and then processed into qualified products that can be sold, reprocessing there are several methods, let’s take a look

The most commonly used method is to use a machine to polish it, and the grinding marks generated by this method will be obvious, resulting in bumpy surfaces and not smooth, which will affect the appearance, but this situation will not occur with advanced machine grinding

There is also a manual grinding, manual polishing after pickling passivation treatment, for the defective workpiece with a large area, it is difficult to achieve a uniform and consistent treatment effect, can not reach the surface of qualified products, and then it is time-consuming and laborious, the cost of auxiliary materials is relatively high

Generally, sulfuric acid cleaning is first used, and then manual polishing of stainless steel flanges, overall pickling passivation, chemical corrosion or electrochemical corrosion will occur under the condition of the presence of corrosive media, and can not remove due to scratches, welding splash and adhere to the surface of stainless steel carbon steel, splash and other impurities.

Flanges such small parts, although in the whole product, pipeline or machinery is not insignificant, but the role played by the flange is very important, the future with the development of flange materials and processes, to ensure that the whole joint connection process is more precise and firm, to ensure that people’s use of safety and reliability