GOST Flanges 12820-80

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China Main Port
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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:What's the difference between the shape of the flange and the orchid?
The flange is lined with bolts to secure the two flanges. Gaskets for gaskets between flanges. Fittings pipe (flanged) means a pipe with flanges (flanges or plates). It can be formed by casting and (figure not available), may also be threaded or welded together.Flange structure: strip welding, socket welding, threaded connection, loose sleeve, butt welding and flange capThe orchid screw is a special kind of screw. Unlike regular screws, its prominent link weight bearing function. Mainly used in assembly lines, large construction sites, large factories, lifting plants, ship transport, bridge construction, high-rise buildings and so on.
Q:What's the flange for?
According to the factory where we live welding flanges, it is a product that connects the pipes. There are various ways of connecting and sealing. The material is also varied. A disk with many bolt holes on it. There is a hole in the center. It is used to weld the pipe. Such a thing is called a flange.
Q:What do you mean, flange four?
The number of holes is a multiple of 4
Q:A type flange is different from B type flange
Type A -- the form of attached flange (Flange, connection), that is, single flange (with O ring) and the other end is equipment.Type B -- the form of the connecting flange (Flange-type, coupling), that is, paired flanges (one with O rings).
Q:Flange connections of different sizes
Variable diameter flange, also known as Reducing Flange, and its inner diameter and the standard flange diameter, there are some differences.In engineering, when the standard flange can not match the fittings and pipes, the reducing flange is used.China's national standards flange standard (GB) and chemical industry standard (HG) two categories, the new chemical industry standard HG/T20592 ~ 206352009 flange is used to the EN as the representative of the European standard pipe flanges (nominal pressure expressed by PN) and the United States as the representative of the American ASME system (nominal pipe flange the pressure expressed by Class), between them the nominal size of the feature size is different; moreover, our country pipeline diameter series is also divided and metric Inch series series, there are differences in the nominal size; in addition, when there are special requirements, such as flange instrument joints, when the glass lined the characteristics of some special requirements (give it a separate "glass lining of different diameter flange" HG/T2140-2009 standard). Therefore, the inevitable mixing in the project, the use of reducing the flange diameter of the method is the simplest and most effective solution, thus the emergence of non-standard variable flange.
Q:What does the flange mean? What does "flange" mean?
Flanges (Flange) are also called flanges or flanges. The flange is the part that connects the pipe to the pipe 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. Flange, threaded connection (wire), flange and welding flange.
Q:WN-RTJ what's the full name of the flange?
WN indicates that the butt welding neck flange RTJ has not been seen, but there is a RJ ring connection surface. Flanges are generally used for high pressure
Q:What is the water line flange and what is the difference between it and the ordinary flange?
Water line flange. For the same sealing surface flange, if the sealing surface has water line, the sealing effect is better, applicable pressure higher.Water has no specific criteria, are generally custom processing, mainly divided into three types, one is the spiral, concentric circle and three water line line, close comparison of the helix, concentric helices to some relatively sparse. Conditional permission, 1~3 lane. Usually the structure is: inverted right triangle (cross section form), according to requirements, generally 2mm wide, 1mm deep.The utility model has the function that a labyrinth seal is formed when the flange is connected, and the leakage of gas or liquid is reduced. In addition, if the flange is connected with a non-metallic gasket, it is only possible to process the sealing water line; if the metal gasket is sealed, the water line is not processed.
Q:Flat plate concave convex flange has no national standards?
This is really not available, to the concave convex form of the flange. The pressure is generally high, while the high pressure products are welded or socket welded. Not really flat plate. However, if it is hard to do, there is no problem. But there is no national standard. We are the manufacturer of flanges. Hebei Wan Xing Pipe Industry Co., Ltd., my name is Zhu Xuechun. I hope my answer can help you.
Q:What's the flange joint?
1 、 the short pipe between the flange and the equipment or pipe; the distance between the two parts of the 2 flange is not enough. It is used as the part of the middle connection, and the middle flange of both sides is short.
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