The specification of Welding Neck Flange ASTM A105 ASME B16.5

The surface treatment of welding neck flange

The surface treatment of welding neck flange includes black painting, yellow painting, anti-rust oil, and epoxy. Generally if the customers don’t have special request for the surface, anti-rust oil is commonly used.

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WNRF flange full name called welding neck flange. It is produced with forged process. It can be divided many types according to different standards, materials, and sizes. Due to the transition structure of the cone neck and the butt welding connection, the strength and rigidity of the flange are strengthened, and the sealing performance is better than that of the slip on flange and plate flange. This type of flange is widely used for the places where request high pressure, temperature and leakproofness.

Some datas about carbon steel WNRF flange:

About the sealing surface “RF”:

“RF” is the short name of raised face a kind of sealing face of flanges. The sealing surface of the flange is flat, and the gasket contact area is large. After pretightening, the gasket is easy to extend or move to both sides, and the sealing property is poor, which is only suitable for low-pressure occasions. Except for RF there are other types of sealing faces such as FM(female and male), RJ (ring joint) and TG(tongue and groove) which have better performance in sealing property can be used for high pressure occasions.

The standard of Welding neck flange:

Carbon steel WNRF flange can be produced according to many kinds of standards including Chinese standard, ASME B16.5 / B16.47, DIN2630/2631/2632/2633/2634/2635/2636/2637, JIS B2220, GOST12821, and EN1092. ASME standard is the most popular flange that adopted worldly.

The surface treatment of carbon steel WNRF flange:

Black painting, yellow painting, anti-rust oil, and epoxy are all surface treatments for flanges. Generally if the customers don’t have special request, anti-rust oil is the commonly used.

This is a kind of carbon steel flange with long neck. It can be widely used for connection between steel pipes or steel pipes and fittings of pipeline system. Welding neck flange has many kinds of dimensions, pressures and materials.

Some datas about carbon steel welding neck flange.

There are five types of sealing faces for welding neck flange.

FF Type:

RF Type:

FM Type:

TG Type:

RJ Type:

How to guarantee good quality flanges?

First, production process of welding neck flange must be forged.
Second, to choose the raw materials produced by big steel factories and retesting them after receiving.
Third, do the good job in the production testing for each producing step.
Last, do the good job in the inspection for finished products.

Pn16 carbon steel WN flange manufacturer and exporter is Beijing Metleader pipeline technology inc, is an ISO9001:2008 and CE certificated company. WN flange is the abbreviation of welding neck flange, which is used commonly in lots of industries. Carbon steel WN flange is a kind of the most cost-effective products.

Pn16 carbon steel WN flange is a flange used in pipeline, must withstand pressure of 16 kg. We also provide other carbon steel WN flanges that withstand the pressure of 6kg, 10kg, 25kg, 40kg, equal to PN6, PN10, PN16, PN40 carbon steel WN flange.

Standard of pn16 carbon steel WN flange:

ASME B16.5,  ASME B16.47, DIN, JIS, GOST, EN, UN

Size of WN flange: 1/2 inch – 48 inch

The main material of pn16 carbon steel WN flange:

ASTM A105, ASTM A694 F42/46/52/56/60/65/70, ASTM A350 LF2/LF3

Other material of WN flange:

Stainless steel: ASTM A182 F304, F304L,F316,F316L,F321,F347,F310F44F51, etc

Alloy steel: ASTM A694 F42,F46,F52,F56,F60,F65,F70, A182 F12,F11,F22,F5,F9,F91,F11, etc

Pressure of carbon steel WN flange:

PN6, PN10, PN16, PN20, PN25, PN40

ANSI B16.5: Class 150, 300, 600, 900, 1200 1500 2500

ASME B16.47 SERIES A: Class 150, 300, 600, 900

ASME B16.47 SERIES B: Class 75, 150, 300, 600, 900

Other types of flange:

Slip on flange

Plate flange

Socket flange

Threaded flange

Blind flange

Lap joint flange

WN flange face types: Flat Face/FF, Raised Face/RF, Ring Type Join/RTJ

Package of WN flange: usually in wooden cases or pallets, or according to client’s requirements

Inspection: Our pn16 carbon steel WN flange are inspected one by one, to ensure the quality,  we also have some hot sale types of WN flange in stock, so if you have any need, please contact us freely.

Weld neck flang class 300 is ASME standard,it also has Class 150;Class 300;Class 600;Class 900;Class 1500;Class 2500.weld neck flange is a flange with neck and round pipe transition and butt welded with pipe. weld neck flange is not easy to deform, well sealed, widely used, has the corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition, weld joint distance from the joint surface, joint surface from welding temperature deformation

Advantages of welding neck flange:
weld neck flange is not easy to deform, well sealed, widely used, has the corresponding rigidity and elasticity requirements and reasonable butt-welding thinning transition, weld distance from the joint surface is large, joint surface is free from welding temperature deformation, it adopts a more complex trumpet-shaped structure, suitable for pressure or temperature fluctuation of pipelines or high temperature, high pressure. And low-temperature pipes, generally used for PN greater than 2.5 MPa pipes and valves connection; also used to transport expensive, flammable, explosive medium pipes.

Product parameters
(2) bolt hole central circle diameter: 50mm—-2130mm
(3) bolt hole diameter: 11mm-30mm
(6) flange thickness: 12mm-58mm
(7) outer diameter of pipe: A (17. 2-2032MM) B (14-2020MM)
(8) flange inner diameter: A (18-2036MM) B (15-2024MM)
(9) flange theoretical weight: 0.36kg–234.6kg (DN1800)
According to the production process flange is mainly divided into: forging flange, casting flange, cut flange, rolled flange these four kinds.Beijing Metleader Pipeline Technology Inc. Main product is forging flange.
Advantages of forging flange
Forging flanges are generally lower than those of cast flanges with low carbon content and are not easy to rust.
Improper forging process will also lead to large or uneven grains and hardening cracks.
The advantage of forging is that the internal structure is uniform, and there are no harmful defects such as blowholes and inclusions in the casting.

Making weld neck flange video:

The manufacturer and exporter in china, Metleader had 36 years old experience of all kind of flanges. Hot-Sales product DIN 2316 PN6 weld neck flange, belongs to the German standard flange system, also known as DIN flange, is a type of flange, often used for export or China’s import equipment or pipelines.

DIN 2316 PN6 weld neck flange is a flange with a neck and a circular tube transition and welded to the pipe. The DIN 2316 PN6 weld neck flange is used for the pipe welding, the structure is reasonable, strong and stiffness, withstand high temperature and pressure and repeated bending and temperature fluctuations, reliable sealing. The 0.25~2.5mpa flange with nominal pressure is concave-convex sealing surface.

DIN 2316 PN6 weld neck flange is a disk-like parts, in the pipeline engineering is most common, flange are pairs and with the valve on the matching flange use. In pipeline engineering, flanges are mainly used for piping connections. In the need to connect the pipe, the installation of a pair of flange, low pressure pipe can use wire flange, when the pressure is PN6 or more, should use of weld neck flange. There is a gasket between the two flanges and tighten with bolts. Different bolts match different pressure flanges with different thickness.
DIN 2316 PN6 weld neck flange is a kind of hot sale product recently.the welding type to connect the carbon steel weld neck flange and pipe is butt weld, which is same the connection between pipe and pipe, generally adopt Argon arc welding bottom, manual welding cover when the diameter is samll, buy if the pipe diameter large only use double-sided welding.

AWWA c207-07 steel flange refers to the standard of steel pipe flanges for water supply engineering in the United States. The form of flange has three kinds, ring, Hub, blind. Ring refers to flat flange, hub and with neck flat welding flange shape Similar, blind is the flange cover. Customer orders are generally custom-made ring, blind. The hub is rarely encountered.

Flange pressure is divided into class B, D, E, F is four kinds, fingering the blue pressure 86psi, 175-150psi, 275psi, 300psi. This flange has no sealing surface, belongs to FF full plane, flange surface is made concentric round thread waterline. The material used for flanges is generally A105. Specification from 4 ” -144″. is the United States standard flange standards inside the largest of a flange standard.

Material:
CARBON STEEL: A105
STAINLESS STEEL: 304, 304L, 316, 316L
ALLOY STEEL: A387
AWWA C207 Steel Flange Surface Anti-rust:
Anti-rust light oil,
Black paint coating,
Galvanized (Hot galvanized or Cold galvanized or Electro Galvanized)

AWWA C207 Steel Flange Surface Finish:

Stock finish
Spiral serrated
Two or three grooves (Water Lines)
Smooth finish

Basic procedure of forged AWWA C207 steel flange:
Forged flange forging in the free time, the shape of forgings through some basic deformation process will be the billet gradually forged, the basic process of free forging has upsetting, pulling long, punching, bending and cutting, the following is the forging flange of several processes.
1. The forging process that bends the billet into a certain angle or shape.
2. Cutting the blank or cut the material head of the forging process.
3. Upsetting is the original billet along the axial forging, so that its height reduction, cross section of the operation process, this process is often used for forging gear billet and other disc-type forgings, upsetting is divided into all upsetting and local forging coarse two.
4. The forging process that reverses the rotation of a part of the billet to a certain angle relative to the other part.
5. Drawing length is to make the length of the billet increased, section reduction of the forging process, is usually used to produce shaft-like pieces of blanks, such as lathe spindle, connecting rod and so on.
6. Punching the punch in the billet to flush out through holes or through the hole in the forging process.

Different from the carbon steel forging flange, the casting flanges have rough shape, accurate size, small processing capacity, low cost, but casting defects (pores), cracks (inclusions) castings of the internal structure is not good (if cutting, streamline worse). And the forging flange is usually more carbon-free than the cast flanges, they are less prone to rust, they streamline, relatively compact structure, casting flange mechanical properties Superior.
The improper forging process also leads to large or uneven grains, hardening and cracking, and the forging cost is higher than that of the casting flange. Forgings bear higher shearing force and tensile strength than castings, and the advantages of casting are that they can produce more complex shapes of flange manufacturers and lower cost.
Our company some type pipe flanges:

Stainless steel slip on flange	Blind flange	Weld neck flange	Plate flange	Threaded flange

Some type steel flanges and different size:
carbon steel AWWA hub flange
carbon steel AWWA ring flange
140 inch steel AWWA flange
60 inch steel AWWA flange

ASME carbon steel pipe flange is a kind of component which is widely used in engineering design. It is according to the United States standard production of a piping design, pipe valve essential parts, but also equipment, equipment parts (such as manhole, visual mirror, etc.) in the necessary components. In addition, other professions such as industrial furnaces, thermal workers, water supply and drainage, heating ventilation, automatic control, etc., also often use flange joints.

Implementation standard: ASME b16.5, ASME B16.47, AWWA
In addition to the United States standard flange, there are other standards of flange, such as Din, JIS, BS, KS, GB, GOST and so on.
Classification: Slip on flange, Weld neck flange, Ring flange, Socket flange, Threaded flange and Blind flange.
Material: Forged steel A105, stainless steel f316l, F316, f304l, F304, F321, alloy steel, etc.

Flange type and sealing surface form 1/6
1.Slip on Flange

Slip on Flange is a national standard flange (also known as GB flange) One of the manifestations, is the equipment or pipe one of the common flange.
Advantages: It is convenient to install on site, and can omit the operation procedure of weld clap and rub injury.
Disadvantages: The neck height is lower and the stiffness and bearing capacity of flange are improved.
Compared with the butt welding flange, the welding work is heavy, the electrode consumption is high, which cannot withstand high temperature and pressure and repeated bending and temperature fluctuation.
Flange type and sealing surface form 2/6
2.Weld Neck Flange

The sealing surfaces of the neck butt weld flange are: Surface (RF), concave (FM), Convex (M), Tenon face (T), Groove surface (G), full plane (FF).
Advantages: The connection is not easy to deform, the sealing effect is good, the application is widespread, is suitable for the temperature or the pressure large fluctuation pipeline or the high temperature, the high pressure and the low temperature pipeline, also uses in transporting the expensive medium, the flammable explosive medium, the poisonous gas pipeline
Disadvantages: With neck butt welding flange is bulky, heavy weight, expensive, installation positioning is difficult. So it’s easier to bump in transit.
Flange type and sealing surface form 3/6
3.Socket Flange

The socket welding flange is a bolted flange connected to the other end of the pipe.
Sealing surface form: Surface (RF), concave-convex surface (MFM), tenon groove surface (TG), Ring Junction (RJ)
Application scope: Boiler pressure vessels, petroleum, chemical, shipbuilding, pharmaceutical, metallurgy, machinery, stamping elbow food and other industries.
Commonly used in pn≤10.0mpa,dn≤40 pipelines.
Flange type and sealing surface form 4/6
4. Threaded Flagne

The threaded flange is a kind of non welded flange, which is to process the inner hole of the flange into pipe thread and connect with the pipe with thread.
Advantages: It is a peaceful welding flange or butt flange compared to the thread flange with the installation and maintenance of convenient features, can be used in some of the site is not allowed to weld the pipeline.
Alloy steel Flange has enough strength, but not easy to weld, or welding performance is not good, can also choose threaded flange.
Disadvantages: It is recommended that no threaded flange be used to avoid leakage when the pipe temperature changes sharply or the temperature is above 260 ℃ below 45 ℃.
Flange type and sealing surface form 5/6
5. Lap joint Flange

Lap joint Flange is able to move the flange, generally supporting in the water supply and drainage accessories, factory factory telescopic joints at both ends of each have a piece of flange, directly with the project pipeline, equipment with bolted connection.
Role: The purpose of using the ring flange is to save the material, the structure is divided into two parts, the pipe part ends and the pipe is connected, and the welding ring is made to the end.The flange uses low grade material, and the pipe part uses the same material as the pipe, achieves the material saving purpose.
Advantages: Cost savings. When the material is special and the price is expensive, the flange with the same material is high cost. It is not convenient to weld or is not easy to process or require a large strength.
such as plastic pipe, glass pipe and so on. Easy to construct.
If the flange bolt hole corresponding to the connection is not easy to find or to prevent future replacement of equipment flange bolt hole has changed.
Disadvantages: Bear low pressure. Low strength of weld ring (especially when the thickness is below 3mm)
Flange type and sealing surface form 6/6
6.Blind Flange

The function is the same as the welded head and the wire buckle cap, except that the blind flange and the screw cap can be unloaded at any time, and the welded head is not. There are many types of sealing surface, there are full plane, surface, concave-convex surface, tenon groove surface, ring connection surface.
The main areas of production are in the vicinity of Meng Cun.
Flange Cover Sealing Surface: Plane (FF), surface (RF), concave-convex surface (MFM), tenon-groove surface (TG), Ring Junction (RJ)

Our company some type pipe flanges:

JIS flange	DIN flange	AWWA flange	Slip on flange	Neck flange

Some type steel flanges and different size:
2 inch ASME carbon steel weld neck flange
20 inch ASME carbon steel weld neck flange
4 inch ASME carbon steel slip on flange
8 inch ASME stainless steel slip on flange

Welding neck flange is a kind of pipe, refers to the neck and has a circular pipe transition and the pipe to weld the flange. Butt welding Flange is not easy to deformation, sealing good, widely used, has the corresponding rigidity and elasticity requirements and reasonable to weld thinning transition, welding distance from junctions, junctions from welding temperature deformation.
Advantages: The connection is not easy to deform, the sealing effect is good, the application is widespread, applies to the temperature or the pressure large fluctuation the pipeline or the high temperature, the high pressure and the low temperature pipeline, also uses in transporting the expensive medium, the flammable explosive medium, the poisonous gas pipeline.
Disadvantage: with neck butt welding flange bulky, heavy weight, expensive, installation positioning is difficult. So it’s easier to bump in transit.

Detail information of carbon steel welding neck flange:

The connection between the pipe flange and the pipe must meet the following requirements:
1 The center of the pipe and the flange should be on the same horizontal line.
2 The center of the pipe is perpendicular to the sealing surface of the flange at a 90 degree angle.
3 The position of the flange bolts on the pipe should be consistent.

What are the international common standards of pipe flanges?
The common international standard for pipe flanges can be summed up as two different and not interchangeable pipe flanges: One is the European flange system represented by Germany, and the other is the American pipe flange system represented by the United States. Germany and the United States the two major systems of the nominal pressure of the pipe flange is basically different, cross but there are duplicates, two system of pipe flange connection size is completely different, can not match each other.welding flange include slip on flange and weld neck flange.

Different slip on flange and welding flange?
The welding neck flangee is the pipe diameter and wall thickness of the interface end as well as the pipe to be welded, which is welded as two tubes.
The slip on flange is a concave table machined with a slightly larger outside diameter than the pipe, which is welded inside.
Slip on flange and welding neck flange refers to the flange and pipe connection when the welding method, flat welding flange welding when only one side welding does not need to weld the pipe and flange connection of the inner mouth, butt welding flange welding installation needs flange double-sided welding. So the flat welding flange is generally used for low, medium pressure pipe, butt welding flange for medium and high pressure pipe connection, the flange of the welding is generally at least pn2.5mpa, using butt welding is to reduce stress concentration, the general butt welding Farrando for neck flange is also called high neck flange. Therefore, the installation of welding flange costs, labor costs and ancillary costs to high, because more than a process.

Another type pipe flange:

carbon steel socket flange	6 inch pn 16 stainless steel SO flange	2 inch carbon steel blind flange	6 inch stainless steel weld neck flange	carbon steel plate flange

The different size welding neck flange:
2 inch carbon welding neck flange
6 inch stainless weld neck flange
ASME B16.5 carbon steel WN flange