GOST Flanges 12820-80

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China Main Port
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TT or LC
Min Order Qty:
1 Ton m.t.
Supply Capability:
9000 Tons per Year m.t./month

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Detailed Product Description

ASTM A105, A182, A350, A694, ST35.8, ST45.8, ST37.2, C22.8, SS400, SM400B, 20Mn, 20 #, Q235, 16Mn, F304/304L, F316/316L, F321,

Professionally export,designed, produced and sold such as ANSI/ASME,MSS,JIS B2220,DIN,B.S.,EN1092,GOST,UNI,AS2129,SHIP,GB,HG,SH,SHJ,SGJ standard forging flanges,Plate flanges,Welding neck flange,Blind flange and flange buttons.


The main material for carbon steel, stainless steel and alloy steel, such as ASTM A105, A182, A350, A694, ST35.8, ST45.8, ST37.2, C22.8, SS400, SM400B, 20Mn, 20 #, Q235, 16Mn, F304/304L, F316/316L, F321, LF2,F11/42/46/52/60/65, 15CrMo, 12Cr1MoV such.


The production base total area is about 82,300 square meters.The annual production capacity is more than 9000 tons, with fine processing technology and advanced detection means.


The company has passed Rhine, Germany(TüV) ISO9001 quality management system certification , European pressure equipment  and materials PED97/23/EC certification and German pressure equipment  and  materials AD2000-WO certification. It has also passed the pressure pipe components manufacturing safety registered certification of the State Quality Inspection Administration and classification societies certified .So a more effective guarantee is provided for the quality of the products.It has become the one of the enterprises  firstly through the certification in the industry.It plays an important leading role in the industry.


The high-quality products are widely used in petroleum, chemical, metallurgy, electric power, ship, natural gas , pipeline industries and so on.It has won the users good evaluation.At the same time,the products are exported to Europe and the United States, the Middle East, Africa and South-East Asia regions and other countries.


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Q:Which is the same diameter flange and flange lid?
This depends on the specific specifications, small flange cover more expensive than large diameter flange, flange flange Gabby expensive
Q:What is the difference between a threaded connection and a flanged safety valve?
There is no difference in useJust the connection is not the sameThread connection is mainly used for small caliber valve, 50mm or soFlanges are generally used in large and medium-sized safety valves
Q:What do DN and PN stand for on the flange?
Nominal diameter (nominal, diameter), also known as the average diameter (mean, outside, diameter).Nominal diameter is the size of all piping accessories in the piping system. The nominal diameter is a convenient round integer for reference and is not strictly related to the processing size. The nominal diameter follows the letter "DN" followed by a number sign.DN is nominal diameter, nominal diameter (or nominal diameter), that is, all kinds of pipe and pipe accessories of universal caliber. The pipes of the same nominal diameter can be connected with each other and are interchangeable. It is not the outer diameter or inner diameter of the pipe in actual sense, although its value is close to or equal to the diameter of the pipe.PN nominal pressure.DefinitionRelating to the mechanical and dimensional characteristics of the components of the piping system and the identification of letters and combinations of numbers for reference. It consists of letters PN and followed by dimensionless numbers.Note 1: numbers followed by letters "PN" do not represent measurements and are not used for purposes of calculation unless otherwise specified in the relevant standards.Note 2: is not associated with the relevant pipe component standards, but the term "PN" does not make sense.Note the 3: piping element allows the pressure to depend on the PN value of the element, the material and design, and allows the operating temperature, etc., to allow the pressure to be given in the corresponding standard pressure temperature class table.Note 4: all pipe elements with the same PN and DN values shall have the same mating dimensions as their flanges.
Q:What's the difference between the flange and the flange cap?
Flanges, also known as flanges, usually refer to a connecting piece that opens several fixed holes in the periphery for connection. Widely used in machinery, form the shape of all sorts of strange things, as long as the image is called the flange, from English flange. The utility model relates to a medium used for connecting pipe fittings, which is a ring made of material which has plastic deformation and has a certain strength (and now has a non-circular flange connection). Most gaskets are cut from non metal plates or made by professional factories according to the specified sizeFlange cover is also called blind flange and blind plate. It is a flange without holes in the center for sealing the plug of the pipe. With welding head and screw cap is the same, but the blind flange and screw cap can be unloaded, and the welding head. There are many forms of sealing surface, such as flat surface, convex surface, concave convex surface, tenon and groove surface and ring connecting surface.
Q:Mechanical flange problems, there is a pair of flange drawings, the above mark is 6-M12 evenly distributed 23 drill 24, what is the specific meaning?
This should be M12 thread depth, drilling depth of 24mm, tapping depth of 23mm.
Q:What is the nominal diameter of a flange? What is the nominal diameter of a pipe?
The nominal diameter of the 1. flange refers to the inner diameter of the pipe to be matched with each other;2. the nominal diameter of the pipe is the inner diameter of the pipe (the diameter of the inner hole).
Q:Who knows the connection flange - 2.5 inches RFSO DIN PN 40? What does that mean? What's the country's standard, RFSO?
RFSO is SO/RF, said hubbed, 2.5 inches is equivalent to DN65, i.e. the flange diameter is 76mm, PN40 is the nominal pressure of 400 kg. Elbow DN65 (73) - 73 OD x 2.6 WT is a non-standard elbow with an elbow diameter of 73mm,
Q:Where is the flange used in the pump?
The import and export are flanges, valves and so on, may have to use the flange
Q:What's the flange on the sprocket?
According to the description, spurts phenomenon is actually the roller and sprocket chain lead to alveolar not fully engaged, this 2 points to consider:First, there may be a chain pitch error, may wish to change several chains try. However, the chain is standard, this possibility is relatively small.Two is the sprocket tooth distance error, although sprocket processing is very delicate, but if it is small batch, often line cutting or milling cutter into teeth. Roundness is out of the car, easy to guarantee, the pitch is cut or milling out, it is difficult to say. The diameter of the graduated circle is not so good.
Q:What is the flange made of?
The flange is the part that connects the pipe to the pipe and the valve and is connected to the end of the pipe. The flange is lined with bolts to secure the two flanges. Gaskets for gaskets between flanges. Flanges, threaded connections (wire connections), flanges and welded flanges and clamp flanges. There are many materials, our factory produces stainless steel flange: 304 304L 316 316L 316Ti F321 dual phase steel flange: F51, F53, F55, F60, F44, special alloy steel flange: Incoloy800H 625, N08020, Monel400, C276, C22 and so on
Our company has strong professional technical force, rich experience, integrated data and advanced equipment, as well as high-quality forging, machine-processing, assembling and packing production lines. Our product quality is in full compliance with both national and international standards, and we have obtained the ISO9001-2000 quality certification. Warmly welcome all to come to visit, investigate and negotiate business.

1. Manufacturer Overview

Location Shandong,China
Year Established 2008
Annual Output Value
Main Markets North America
South America
Eastern Europe
Southeast Asia
Mid East
Eastern Asia
Western Europe
Central America
Northern Europe
Southern Europe
Company Certifications ISO9001:2008

2. Manufacturer Certificates

a) Certification Name  
Validity Period  

3. Manufacturer Capability

a)Trade Capacity  
Nearest Port qingda
Export Percentage 81% - 90%
No.of Employees in Trade Department
Language Spoken: English, Chinese
b)Factory Information  
Factory Size: 10,000-30,000 square meters
No. of Production Lines 10
Contract Manufacturing OEM Service Offered Design Service Offered Buyer Label Offered
Product Price Range Low and/or Average