How to get high quality alloy flanges
What is a alloy steel flange?
Alloy steel flange, the main material is alloy steel. Alloy flanges provide an easy access for cleaning, inspection or modification. They usually come in round shapes but they can also come in square and rectangular forms. The alloy flanges are joined to each other by bolting and joined to the piping system by welding or threading and are designed to the specific pressure ratings; 150lb, 300lb, 400lb, 600lb, 900lb, 1500lb and 2500lb.
Alloy Steel Flanges, Alloy flanges are designed with care using current techniques under the visionary guidance of accomplished professionals at manufacturing unit. Offered range is stringently tested on various parameters of quality for ensuring flawlessness and defect free. These products are widely used in various industries and widely appreciated by clients for owning unmatchable characteristics. Offered range supplied in quality assured packaging material.
Alloy Steel Flanges, Alloy flanges Finished
Natural, Nickel Plated, Electro Polished Plated or any coating as per customer specification.
Any kind of special die casting sand gravity die lost wax shell moulding castings and cast parts casting produced to user specifications. We can be more competitive than Chinese castings and cast parts made in China as traditional Indian expertise in Brass castings and Brass casting is superior and Indian alloy Steel foundry / foundries are more competitive than other S.S. alloy Steel foundries.
Custom Alloy Steel Flanges, Custom Alloy flanges
Alloy Steel Flanges, Alloy flanges are corrosion resistant and have a wide variety of uses. We carry a variety of threaded flanges, weld neck flanges and slip- on flanges and, of course, we can can custom build steel flanges to your specifications.
Types of Alloy Steel Flanges
Alloy Steel Flanges, Alloy flanges are corrosion resistant and have a wide variety of uses:
Welding Neck Flanges
A weld neck flange (also known as a high-hub flange and tapered hub flange) is a type of flange.
The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.
A weld neck flange (also known as a high-hub flange and tapered hub flange) is a type of flange. There are two designs. The regular type is used with pipes. The long type is unsuitable for pipes and is used in process plant. A weld neck flange consists of a circular fitting with a protruding rim around the circumference. Generally machined from a forging, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts.
WELDING NECK FLANGE NPS 6, CLASS 150, SCHEDULE 40, ASME B16.5 / ASTM A105
The flange above has 8 bolt holes, and a welding bevel of 37.5 degrees (red circle). All given dimensions are in millimeters. The raised face (RF) does not need to be specified, because according to ASME B16.5, each flange is standard delivered with a raised face. Only a different design (Ring Type Joint (RTJ), Flat Face (FF) etc.), should be specified.
The welding neck flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value.
Expander Flange
Expander Flange is a Welding Neck pipe flange where the nominal size of the non-flanged end is larger than the nominal size of the flanged end. They can be used to change the size of a pipe run. These are usually used to increase the line size to the first or second larger size. This is an alternative to using a separate reducer and weld neck flange combination. The expander flange can be used to connect pipe to pumps, compressors and Valves.
Long Weld Neck Flanges
Long Neck Welding (abbreviated LWN) flanges are similar to a standard Welding Neck flange, but the “Neck” is considerably longer. This type is often used as a nozzle for a barrel or column. In addition, there are the type LWN Heavy Barrel (HB) and the Equal LWN Barrel (E); they have a different shape and a thicker “Wall”.
NW Long Weld Neck Flanges
The NW Long Weld Neck Flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.
Weldoflange, Nipoflange
The Weldoflange and Nipoflange is a combination of a Welding Neck flange and a supposedly Weldolet or Nipolet.
Slip-On Flanges, SO Flange
Slip-On flanges or SO flanges are commonly lower in price than weld-neck flanges, and to this effect are a popular choice for our customers.
Slip-On Pipe Flanges. As made obvious by their name, these pipe flanges slip over the pipe. They’re manufactured with an inside diameter that is slightly bigger than the pipe’s outside diameter. These attachments are connected to the pipe via fillet weld at the top and bottom of the flange.
Slip-on flanges are all bored slightly larger than the O.D. of the pipe. They are preferred over welding neck flanges bu many users due to their lower intial cost, but final intallation cost is probably not much less than that of the welding neck flange because of the additional welding involved.
Weldneck and Slip-On Orifice Runs
Advantages of slip on flanges:
- Low cost installation
- Less time needed to spent on ensuring the accuracy of the cut pipe
- They are somewhat easier to align
- The slip-on flanges have low hub because the pipe slips into the flange before welding
- The flange is welded both inside and outside to provide sufficient strength
- They prevent leakage
Socket Welding Flanges, SW Flange
Socket-Weld Flanges has a female socket in which pipe is fitted. Fillet welding is done from outside on the pipe.
The SW flange is similar to a slip-on flange except it has a bore and a counterbore dimension.
The counterbore is slightly larger than the O.D. of the matching pipe, allowing the pipe to be inserted into the flange similar to a slip-on flange.
Lap Joint Flanges
Lap Joint Flanges (LJ Flanges) are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable welding neck flanges.
Lap joint flange is having two components, a stub end, and a loose backing flange. Stub end is butt welded to the pipe and Backing flange freely move over the pipe. The backing flange can be of different material than stub material and normally of the carbon steel to save the cost. Lap flange is used where frequent dismantling is required, and space is constrained.
The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face.
The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face. This radius is necessary to have the flange accommodate a lap joint stub end. Normally, a lap joint flange and a lap joint stub end are mated together is an assembly system.
Threaded Flanges, TH Flanges
Threaded flanges are widely demanded as pipe flanges i.e called as threaded pipe flanges used in different industrial applications.
Threaded Flanges are also known as screwed flange, and it is having a thread inside the flange bore which fits on the pipe with matching male thread on the pipe.
This type of joint connection is Speedy and simple but not suitable for high presser and temperature applications. Threaded Flanges are mostly used in utility services such as air and water.
Figure-8 Blanks (Spectacle Flange)
A figure-8 blank (also called a Spectacle Blind Flange) is+ a pressure-retaining plate with one solid end and one open end connected with a web or tie bar.
Specifications:
Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ
A spectacle flange is a specialty flange made of two metal discs attached in the middle by a small section of steel. Spectable flanges get their name because they look like a pair of reading glasses, or spectacles. Spectacle flanges, also known as spectacle blind flanges, are most commonly used on piping systems that need to be separated regularly or where the flow through the systems is regularly stopped. One end of the spectacle flange is solid, while the other end has a hole in the center. The spectacle flange can be rotated to place either the solid or hollow end within the pipe system, thereby opening or closing the flow.
Keywrods: Spectacle Blind Flanges, Spectacle Blind Flange, Spectacle Flanges, Spectacle Blind Flanges manufactory
Advantages of Spectacle Flanges
- Spectacle flanges require no welding for installation
- Spectacle flanges from Yaang Flange have a wide range of pressure tolerances
- Yaang Steel will manufacture spectacle flanges to your specifications
Classes of spectical blind flange
- 150# RF Flange Rating
- 300# RF Flange Rating
- 600# RF Flange Rating
- 900# RF Flange Rating
Yaang manufacturing arena is well known in the market that comprises of various flanges one of which is Alloy Steel flanges. They are available in variety such as weld neck, Deck flange, lap joint etc. They are made of steel and other metals thereby forming an alloy. These flanges have undergone stringent quality check and have been certified by national authorities.
Grades of Alloy Steel Flanges, Alloy flanges:
We shall be pleased to develop Non-Standard
- ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2
- ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70
- ASTM A182 F1, F5a, F9, F11, F12, F22, F91
Chemical Requirements (Composition, %, max)
| Material Symbol | C | Mn | P | S | Si | Ni | Cr | Mo | Cu | N | V | Co |
| ASTM A105 | 0.35 | 0.60-1.05 | 0.035 | 0.040 | 0.10-0.35 | 0.40 | 0.30 | 0.12 | 0.40 | _ | 0.08 | _ |
| ASTM A350 LF2 | 0.30 | 0.60-1.35 | 0.035 | 0.040 | 0.15-0.30 | 0.40 | 0.30 | 0.12 | 0.40 | _ | 0.08 | 0.02 |
| ASTM A182 F304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-11.0 | 18.0-20.0 | _ | _ | _ | _ | _ |
| ASTM A182 F304L | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 8.0-13.0 | 18.0-20.0 | _ | _ | _ | _ | _ |
| ASTM A182 F316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 | _ | _ | _ | _ |
| ASTM A182 F316L | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-15.0 | 16.0-18.0 | 2.00-3.00 | _ | _ | _ | _ |
| ASTM A182 F321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 9.0-12.0 | 17.0-19.0 | _ | _ | _ | _ | _ |
| EN 10025 S235JR | 0.20 | 1.40 | 0.045 | 0.045 | _ | _ | _ | _ | _ | 0.009 | _ | _ |
| 20Mn | 0.17-0.23 | 0.70-1.00 | 0.035 | 0.035 | 0.17-0.37 | 0.30 | 0.25 | 0.25 | ||||
| 20 (Alloy 20 Threaded Flange) | 0.17-0.23 | 0.60-1.00 | 0.030 | 0.020 | 0.17-0.37 | 0.25 | 0.25 | 0.25 | ||||
| 16Mn | 0.13-0.19 | 1.20-1.60 | 0.030 | 0.020 | 0.20-0.60 | 0.30 | 0.30 | 0.25 |
Mechanical Requirements
| Material Symbol | Tensile Strength, min, MPa | Yield point, min, Mpa | Elongation, min, % | Reduction of area, min, % | Hardness, max, HB |
Min. Impact Average, J |
Test Temperature, °C |
| ASTM A105 | 485 | 250 | 22 | 30 | 187 | ||
| ASTM A350 LF2 | 485-655 | 250 | 22 | 30 | 20 | -46 | |
| ASTM A182 F304 | 515 | 205 | 30 | 50 | |||
| ASTM A182 F304L | 485 | 170 | 30 | 50 | |||
| ASTM A182 F316 | 515 | 205 | 30 | 50 | |||
| ASTM A182 F316L | 485 | 170 | 30 | 50 | |||
| ASTM A182 F321 | 515 | 205 | 30 | 50 | |||
| 20Mn | 450 | 275 | 24 | 50 | 197 | ||
| 20 (Alloy 20 Slip On Flange) | 410 | 245 | 25 | 55 | 156 |
Yaang carry a large inventory of Alloy Steel Flanges, Alloy flanges in many types and sizes.
STANDARDS
Several organizations and associations have published specifications that provide dimensional information as well as pressure specifications at different temperatures.
European and German Dimension DIN
Germany and several other countries in the European Union mainly install flanges according to standard DIN EN 1092-1 (forged Stainless or Steel Flanges). Similar to the ASME flange standard, the EN 1092-1 standard has the basic flange forms, such as weld neck flange, blind flange, lapped flange, threaded Flange (Thread ISO7-1 instead of NPT), weld on collar, pressed collars, and adapter flange such as flange coupling GD pressfittings. The different forms of flanges within the EN 1092-1 (European Norm Euronorm) is indicated within the flange name through the type.
| Design | According to EN Type | According to DIN |
|---|---|---|
| Weld Neck Flange | Type 11 | DIN 2627 – DIN 2638 |
| Blind Flange | Type 05 | DIN 2527 |
| Threaded Flange | Type 12 | DIN 2558, DIN 2565 – DIN 2569 |
| Flat Flange | Type 01 | DIN 2573, DIN 2576 |
| Lapped Flange | Type 02 & Type 04 | DIN 2641, DIN 2642, DIN 2655, DIN 2656 |
Similar to ASME flanges, EN1092-1 steel and stainless flanges, have several different versions of raised or none raised faces. According to the European form the seals are indicated by different form:
| Form: types of Contact Faces | DIN EN 1092-1 |
|---|---|
| Without Raised Face | Form A |
| Raised Face (Rz = 160 Mechanical Turned) | Form B1 |
| Raised Face ( Rz = 40 Mechanical Turned) | Form B1 |
| Raised Face (Rz = 16 Mechanical Turned) | Form B2 |
| Tongue According to DIN2512 | Form C |
| Groove According to DIN 2512 | Form D |
| Male According to DIN 2513 | Form E |
| Female According to DIN 2513 | Form F |
| Female According to DIN 2514 | Form G |
| Male According to DIN 2514 | Form H |
ASTM specifications regulate approved raw materials for which flanges can be made and specifications.
ASTM
For stainless steel flanges are:
• ASTM A.182 – Forged or Rolled Alloy Steel Pipe Flanges & Fittings for high temperature service.
ANSI AND MSS SPECIFICATIONS
The standards govern the dimensions and tolerances to which fitting are manufactured:
• ANSI B. 16.5 – Steel Pipe Flanges and Flanged Fittings (½ inch to 24 inch nominal diameter)
• MSS SP.6 – Flange Facings
• MSS SP.25 – Marking of flanges
• MSS SP.39 – Bolts and Nuts for Flanges
• MSS SP.44 – Large Diameter Pipeline Flanges. (Over 24 inch dia)
• API-605 – Large Diameter Flanges for petroleum Usage. (Over 24 inch dia)
ASME
The ASME Code is not a standard as such but section VIII provides the procedure for calculating dimensions for all pressurized vessels flanges.
The following are not flange specifications but they influence the manufacture of forged steel flange:
- ANSI B. 31.10 – Code for Pressure Piping
- ANSI B. 31.3 – Petroleum Refinery Piping
- ANSI B. 31.4 – Oil Transportation Piping
- ANSI B. 31.5 – Refrigeration Piping Systems
- ANSI B. 31.7 – Nuclear Power Piping
- ANSI B. 31.8 – Gas Transmission and Distribution Piping systems
- ANSI B. 36.10 – Standard for Wrought Steel pipe
- ANSI B. 36.19 – Standard for Stainless Steel Pipe
- ANSI B. 16.10 – Valve Dimensions Face & End
- ANSI B. 16.11 – Forged Fittings Socket Weld & Threaded
Source: China Alloy Flanges Manufacturer – Yaang Pipe Industry (www.steeljrv.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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Please notice that you might be interested in the other technical articles we’ve published:
References:
- https://en.wikipedia.org/wiki/Flange#ASME_standards_(U.S.)
- https://www.yaang.com
