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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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 are the welding flanges and blind plates for?
Flange is a bolt that is used to connect a valve or other pipe.Blind plate, solid flange for inlet and outlet of blind pipe.Three way, the pipe of the trigeminal connection parts.Connecting fittings for big head and variable diameter (diameter reducing) pipe.Galvanized antirust. An open-air or environmentally moist place. Are used in the pipeline connecting the above parts of the project
Q:What is flange?
Flange is the abbreviation of flange, usually refers to a similar plate shaped parts of the plate around the opening of several fixed holes used to connect other parts. Flanges are used in pairs. Is widely used in machinery, so it is all sorts of strange things, as long as the call or call the flange flange.The flange is the most common in the pipeline project, in pipeline engineering, mainly used for pipeline flange connection.
Q:What is the water line flange and what is the difference between it and the ordinary flange?
Also called thread forty-five waterline waterline is thread like.In the HG20592-97 standard PN process: flange is less than 4.0MPa with non metallic flat gaskets; using PTFE gasket and flexible graphite composite gasket, car for forty-five waterline, sealing surface named RF (A)HG20592-2009 standard: convex surface, concave / convex surface and full plane sealing surface are processed by cutting tools, naturally formed a sawtooth shaped concentric circles or spiral teeth. The fillet radius of the cutting tool should be no less than 1.5mm, and the sawtooth concentric circle or spiral alveolus depth is about 0.05mm, and the pitch is about 0.45-0.55mm.The clearance and depth of outlet flanges are generally set by customers, usually 0.3mm-1mm wide.American Standard welding flange, sliding sleeve flange width 0.5-0.7mm general requirements. Flat flange customers are mostly required wide 0.7-1mm, depth 0.5-0.8mm.
Q:What's the meaning of duct flange specification L20*4?
Angle steel classification and specifications: mainly divided into equilateral angle steel and unequal angle steel two categories, in which unequal angle steel can be divided into non equilateral, thick and unequal, unequal thickness of two kinds. The specification is expressed by length and angle of edge thickness size. At present, the domestic angle specifications for 2 - 20 cm, to length number number, the same horn steel often have 2 - 7 different edge thickness. Imported steel angles indicate the actual sizes and edges of both sides and indicate the relevant standards. Generally, the length of 12.5cm is larger than that of angle steel, and between 12.5cm and 5cm is medium angle steel. The angle of 5cm is smaller than that of angle steel. Inlet and outlet angle steel orders to use commonly required in the specification, the steel is carbon steel steel corresponding. That is, angles, apart from specification numbers, do not have specific components and performance sets. The delivery length of angle iron is divided into two kinds: the length and the ruler, and the length of the fixed angle of the made angle iron is four to 3, 9m, 4 - 12M, 4 - 19m and 6 - 19m. The length of Japanese steel angle is chosen from 6 to 15m.Wind pipe flange specification L20*4 is equal angle steel 20x20x4 flangeThe habit of writing equal angles is L*X*, L20*4 is 20x20x4 equal angles, and 4 is the thickness of the angle flanges,See the GB/T9787 angle standard
Q:What is the inner flange?
Flanges that connect internal parts and pipes within the equipment generally do not withstand pressure loads
Q:Flange connections of different sizes
If the outer diameter is not big, the bolt hole, the middle diameter and the bore diameter can be unified. If the specifications are different and can not be directly connected, you can use the big head as an excessive.
Q:What is the connection between the valve and the flange seal?
Are standard parts, know the diameter and pressure level, buy ready-made on the line, do not need to know too detailed.
Q:What's the size of the 1 inch flange? What's the thread of the hole on the flange?
It's an inch size, depending on what kind of flange you want, and one inch is 25.4 centimeters.The American Standard flange is expressed in inches. Domestic flanges are represented by DN for flange type and size, the DN25 A series is 34 in diameter (tubing), and the B series is 32 in diameter (tubing)
Q:Install flange wheel tread is what the advantages and disadvantages of widening
Flange (Taiwan) tire block, after the tire increases, leaving enough space for front wheel steering.At the same time, to strengthen the stability of the whole vehicle.In brief, basically, the front steering of the car front wheel and left and right movement are limited, which is in accordance with the tire width stipulated by the manufacturer.If you use widened tires, the original design of the fender position is not enough, there may be steering when the tires touch the mudguard and frictionTraffic safety will be affected, at this time, the pad method (in fact, such as flange gasket (Taiwan called) tire pad), the front wheel shift (i.e. space) without contact fenders, at the same time, because of the left and right track widened, to improve the stability of the car.
Q:What does "F4" and "F5" mean in flanged valves?
Flanges generally do not have such a representationRefer to standard ISO 5211, which indicates the size of the valve drive connection, which is common on the valve
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