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Zhejiang Yihong stainless steel pipeline equipment Co., Ltd! EN

Stainless steel elbow


In piping systems, elbows are used to connect two pipes of the same nominal diameter, Turn the pipe at an angle, Change the direction of the pipe

In terms of angle, there are 45 ° And 90 ° one hundred and eighty ° Three of the most commonly used, in addition to the needs of the project also include 60 ° And other abnormal angle elbows.

The main difference between stainless steel elbow and carbon steel elbow is that the material is different. The chemical composition of stainless steel elbow will keep the elbow surface free from rust and corrosion for a long time.


Stainless steel elbow material: 304/L/H、316/L/H、321/H、317/L、347、310S 、2205 、904L Etc.

 

 Stainless steel elbow


 


    Stainless steel elbow has been widely recognized for its fine workmanship, good bending, bright luster, round diameter and accurate angle. It has been widely used in building decoration, municipal engineering, manufacturing accessories and other fields. Seamless elbow has attracted more and more attention. Stainless steel elbow can play an important role and value in the pipeline connection. According to different standards and classification methods, it can be divided into different types and types. Different types have different functions and advantages, and show different values and roles in use, meeting the needs of the industry.
 
Classification of stainless steel elbows:
 
1. Divide carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, PPC, etc. by material.
 
2. It can be divided into pushing, pressing, forging, casting, etc.

 

3. According to the production process, it can be divided into welding elbow, stamping elbow, casting elbow, etc.
 
4. According to the manufacturing standard, it can be divided into national standard, electric standard, water standard, American Standard, German standard, Japanese standard, Russian standard, etc.
   
        five   The methods of connecting with pipes include direct welding (the most commonly used way), flange connection, hot-melt connection, electric fusion connection, thread connection and socket connection.


 


Stainless steel tee


Stainless steel tee It is a kind of pipe fitting used at the branch of pipe. The stainless steel tee is a section of main pipe plus a small branch pipe. Obviously, the two large sizes are the main pipe, and the small size connecting from the middle is the branch pipe.

For using seamless tube to manufacture tee joint, there are two kinds of commonly used processes: hydraulic bulging and hot pressing. Hydraulic bulging of stainless steel tee is a forming process of branch pipe by axial compensation of metal material. The process is to use a special hydraulic press to inject liquid into the tube blank with the same diameter as the tee, and extrude the tube blank through two horizontal side cylinders of the hydraulic press synchronously. The volume of the tube blank becomes smaller after being extruded, and the pressure of the liquid in the tube blank increases with the decrease of the volume of the tube blank. When the pressure reaches the pressure required for the expansion of the stainless steel tee branch pipe, Under the double action of liquid pressure in the side cylinder and tube blank, the metal material flows along the die cavity and bulges out the branch pipe.


Stainless steel tee production process:

Stainless steel pipe → blanking → bulging → punching forming → flat joint → welding joint (or joint) → solid fusion treatment → white washing → grinding welding mark → polishing → air pressure testing → surface inspection → sticking trademark and certificate → packaging and warehousing.


Classification of stainless steel tee joint:
In industry, the pressure of this kind of equal diameter tee pipe is higher, the maximum pressure can reach 600 kg, and the pressure of domestic water pipe is low, which is generally 16 kg.

Because the tee can be used in many industries, it can be divided into the following categories according to different types:


  1. Divide carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, PPC, etc. by material.
  2. It can be divided into national standard, electric standard, water standard, American Standard, German standard, Japanese standard, Russian standard, etc.
  3. According to the production method, it can be divided into jacking, pressing, forging, casting, etc.


Application fields of stainless steel tee joint:

Construction and maintenance of petrochemical, petroleum and natural gas, liquefied gas, chemical fertilizer, power plant, nuclear power, shipbuilding, papermaking, pharmaceutical, food hygiene, urban construction and other industries.



Stainless steel tee is divided into: stainless steel Equal tee and stainless steel There are two kinds of reducing tee.

 Stainless steel tee
Stainless steel equal tee
 



Stainless steel equal tee

Butt welding connection: socket welding is used for DN 15-dn50 and butt welding is used for DN65.


Technical parameters:
1. Executive and reference standards: GB / T 12771-2000 stainless steel welded steel pipe for fluid transportation and GB / T 12459-2005 steel butt welded seamless pipe fittings.
2. Working temperature: - 40 ℃ - 200 ℃;
3. Corrosion resistance: the welding seam of pipe fittings is not rusted after salt spray test.
4. Flattening test: flatten the pipe to 1 / 3 of the outer diameter, and there will be no cracks or cracks;
5. Tensile strength: not less than 520mpa, elongation not less than 35%, the measured value of this product is 733 MPa;
6. Air pressure test: each pipe has passed 1.6 MPa air pressure test;
7. Pull out test: the connection drawing force of socket argon arc welding pipe is 3 times of the national standard;
8. Pressure test: after connecting the pipe and pipe fittings, there is no leakage at the joint under the condition of 2.5 MPa and pressure holding for 5 min;

Stainless steel reducing tee
Special equipment for reducing tee fittings: the ejector device is installed on the pipe, including metal rod, jacking device, commutator and support, etc; When the metal rod is heated and pushed out by the jack and the metal rod, the pipe wall material will turn out naturally to form a reducing tee blank; Then, a certain length of pipe with corresponding specifications is welded on the blank of reducing tee formed by ejection, and the final product is produced.
Technical parameters:
1. Working temperature: - 40 ℃ - 200 ℃;
2. Corrosion resistance: the welding seam of pipe fittings is not rusted after salt spray test.
3. Tensile strength: not less than 520mpa, elongation not less than 35%, the measured value of this product is 733 MPa;
4. Flattening test: flatten the pipe to 1 / 3 of the outer diameter, and there will be no cracks or cracks;
5. Executive and reference standards: GB / T 12771-2000 stainless steel welded steel pipe for fluid transportation and GB / T 12459-2005 steel butt welded seamless pipe fittings.
6. Pressure test: after connecting the pipe and pipe fittings, there is no leakage at the joint under the condition of 2.5 MPa and pressure holding for 5 min;
7. Pull out test: the connection drawing force of socket argon arc welding pipe is 3 times of the national standard;
8. Air pressure test: each pipe has passed 1.6 MPa air pressure test;
reducer tee The processing method is as follows: mark the reducing tee on the pipe and punch through the mark. The processing method of reducing tee pipe fitting is suitable for processing of reducing tee pipe fitting on different specifications of pipeline; Its special processing equipment has simple structure and low cost. It does not need another injection molding machine and injection mold to manufacture the reducing tee pipe fittings, which can reduce the production cost of such pipe fittings and improve the production efficiency.

 Stainless steel tee (Fig. 2)
Stainless steel equal diameter cross



Stainless steel reducer


Stainless steel reducer Also known as reducing pipe, reducing joint, reducing straight. One of the chemical pipe fittings, used for the connection of two different pipe diameters. And divided into Concentric reducer and eccentric reducer Two kinds.
 
The quality of reducers shall comply with the current national standards GB / T 12459-2005 and GB / t13401-2005.
 
It is manufactured according to GB / t12459, GB / T13401, Hg / t21635, Hg / t21631, sy5010, sh3408, sh3409, ASME / ANSI, b16.9 JIS b2311 / 2312 / 2313, din2605 / 2615 / 2616 / 2617 and other standards.
 Dimensional drawing

    stainless steel Big and small head Sanitary and environmental protection, easy to use, easy to operate, with the new characteristics of old pipe fittings have never had. In engineering construction, stainless steel reducer is gradually used to replace the old pipe fittings, and the stainless steel reducer will be more and more popular. Stainless steel reducer (Fig. 2)  
    Stainless steel reducer can also be called stainless steel reducer, its connection way is many, stainless steel Big and small head The most commonly used processing plants are compression type, compression type, union type, push type, push thread type, socket welding type, union type, flange connection, welding type and welding and traditional connection.
 
     stainless steel
Big and small head The connection mode of stainless steel reducer is based on its principle, which leads to different use range of stainless steel reducer.
 
     But they all have the same feature: easy to install, firm and reliable.
 
 
Various application fields of stainless steel head:
 
I. application in mining and coal industry  
 
(1) mine: the pipeline wear caused by mine filling, concentrate powder and tailings transportation is serious. The service life of the ore powder transportation pipeline used in the past, such as Panzhihua and Daye Mine, is less than one year. The service life of the pipe can be increased by about 5 times.
 
(2) coal: wet transportation is widely used in coal preparation and long-distance pipeline transportation, which requires both wear resistance and corrosion resistance of the conveying pipe. This pipe can be used as a long-life conveying pipe, which has considerable economic benefits.
 
Application in metallurgy and electric power industry  
 
The transportation of coal powder, ash, slurry and lime gypsum slurry in metallurgical and power industries requires a large amount of metal pipelines every year. Using ceramic composite pipe to replace other pipes has the characteristics of high wear resistance, long service life, convenient installation and remarkable economic benefits.  

 Stainless steel eccentric reducer
Stainless steel eccentric reducer (reducer)



Standard for stainless steel pipe fittings


Chinese standard for stainless steel pipe fittings:
 
Standard number         describe  
GB 12459 steel butt welded seamless pipe fittings  
GB / T13401 steel plate butt welded pipe fittings  
GB / t14383 forged steel socket welded pipe fittings  
GB / t14626 forged steel threaded pipe fittings  
Gb9112-9131 steel pipe flange, flange cover and gasket for flange

Japanese standard for stainless steel pipe fittings:

 

Description of standard number  
JIS b2311 general purpose steel butt welded pipe fittings  
JIS b2312 steel butt welded pipe fittings  
JIS b2313 butt welded pipe fittings  
JIS b2316 steel socket welding pipe fittings


Display of stainless steel pipe fittings:


 Stainless steel pipe fittings (Fig. 7)


 Stainless steel pipe fittings (Fig. 8)




 Stainless steel pipe fittings (Fig. 9)


 Stainless steel pipe fittings (FIG. 10)


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