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ASME B16.47 Series A Class 600 Welding Neck Flanges
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel
Thickness: According to ASME B16.47 Series A Class 600
Standard: ASME B16.47 Series A
Pressure Class: Class 600
Flange Type: Welding Neck Flange
Flange Face Type: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) upon request
Connection: Butt Weld
Manufacturing Process: Forging and Machining
ASME B16.47 Series A Class 600 Welding Neck Flanges are large-diameter forged flanges designed for industrial piping systems requiring high strength, reliable sealing, and strong pressure-temperature performance.
The tapered hub and butt-welded connection provide a smooth transition between the flange and pipe, helping distribute mechanical stress and improve fatigue resistance.
These flanges are widely used in oil and gas, petrochemical, chemical processing, power generation, offshore engineering, marine systems, and other heavy-duty industrial piping applications. The reference page specifically identifies oil and gas, petrochemical, and power generation as common applications.
ASME B16.47 Series A Class 600 Welding Neck Flanges Descriptions
ASME B16.47 Series A Class 600 Welding Neck Flanges are designed for large-diameter piping systems where strong mechanical performance and reliable sealing are required.
A Welding Neck Flange features a tapered hub that is butt welded directly to the pipe. This design provides a gradual transition from the flange body to the pipe wall and helps reduce stress concentration around the welded joint.
The long-neck structure provides additional strength and stability, making Welding Neck Flanges suitable for demanding industrial applications involving high temperature and pressure.
ASME B16.47 Series A defines key dimensions including outside diameter, bolt circle, raised-face diameter, bolt-hole arrangement, bore, hub diameter, minimum thickness, and length through hub.
Product Parameters
| Parameter | Description |
|---|---|
| Product Name | ASME B16.47 Series A Class 600 Welding Neck Flange |
| Standard | ASME B16.47 Series A |
| Pressure Rating | Class 600 |
| Size Range | NPS 26" – NPS 60" |
| Flange Type | Welding Neck Flange |
| Connection | Butt Weld |
| Flange Facing | RF, FF, RTJ upon request |
| Material | Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel |
| Manufacturing | Forging + Heat Treatment + CNC Machining |
| Surface Treatment | Anti-rust oil, painting, galvanizing or customized coating |
| Inspection | Dimensional Inspection, Visual Inspection, UT, MT, PMI, Hardness Testing |
| Application | Oil & Gas, Petrochemical, Chemical Processing, Power Generation, Offshore and Industrial Pipelines |
ASME B16.47 Series A Class 600 Welding Neck Flange Dimensions
Class 600 Dimensions | ASME B16.47 Series A Flange
| Nominal Pipe Size | Outside Diameter (O) | Bolt Circle (W) | Raised Face Diameter (R) | Number of Holes | Diameter of Holes | Bore (B) | Top of Hub (A) | Hub Diameter (X) | Minimum Fillet Radius (r) | Minimum Thickness (T) | Length Thru Hub (Y) | Approx. Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 26 | 40.00 | 36.00 | 29.50 | 28 | 2.00 | Specified by purchaser | 26.00 | 29.44 | 0.50 | 4.25 | 8.75 | 940 |
| 28 | 42.25 | 38.00 | 31.50 | 28 | 2.12 | Specified by purchaser | 28.00 | 31.62 | 0.50 | 4.38 | 9.25 | 1060 |
| 30 | 44.50 | 40.25 | 33.75 | 28 | 2.12 | Specified by purchaser | 30.00 | 33.94 | 0.50 | 4.50 | 9.75 | 1210 |
| 32 | 47.00 | 42.50 | 36.00 | 28 | 2.38 | Specified by purchaser | 32.00 | 36.12 | 0.50 | 4.62 | 10.25 | 1375 |
| 34 | 49.00 | 44.50 | 38.00 | 28 | 2.38 | Specified by purchaser | 34.00 | 38.31 | 0.56 | 4.75 | 10.62 | 1540 |
| 36 | 51.75 | 47.00 | 40.25 | 28 | 2.62 | Specified by purchaser | 36.00 | 40.62 | 0.56 | 4.88 | 11.12 | 1705 |
| 38 | 50.00 | 45.75 | 41.50 | 28 | 2.38 | Specified by purchaser | 38.00 | 40.25 | 0.56 | 6.00 | 10.00 | 1470 |
| 40 | 52.00 | 47.75 | 43.75 | 32 | 2.38 | Specified by purchaser | 40.00 | 42.25 | 0.56 | 6.25 | 10.38 | 1630 |
| 42 | 55.25 | 50.50 | 46.00 | 28 | 2.62 | Specified by purchaser | 42.00 | 44.38 | 0.56 | 6.62 | 11.00 | 2030 |
| 44 | 57.25 | 52.50 | 48.25 | 32 | 2.62 | Specified by purchaser | 44.00 | 46.50 | 0.56 | 6.81 | 11.38 | 2160 |
| 46 | 59.50 | 54.75 | 50.25 | 32 | 2.62 | Specified by purchaser | 46.00 | 48.62 | 0.56 | 7.06 | 11.81 | 2410 |
| 48 | 62.75 | 57.50 | 52.50 | 32 | 2.88 | Specified by purchaser | 48.00 | 50.75 | 0.56 | 7.44 | 12.44 | 2855 |
| 50 | 65.75 | 60.00 | 54.50 | 28 | 3.12 | Specified by purchaser | 50.00 | 52.88 | 0.56 | 7.75 | 12.94 | 3330 |
| 52 | 67.75 | 62.00 | 56.50 | 32 | 3.12 | Specified by purchaser | 52.00 | 54.88 | 0.56 | 8.00 | 13.25 | 3560 |
| 54 | 70.00 | 64.25 | 58.75 | 32 | 3.12 | Specified by purchaser | 54.00 | 57.00 | 0.56 | 8.25 | 13.75 | 3920 |
| 56 | 73.00 | 66.75 | 60.75 | 32 | 3.38 | Specified by purchaser | 56.00 | 59.12 | 0.62 | 8.56 | 14.25 | 4280 |
| 58 | 75.00 | 68.75 | 63.00 | 32 | 3.38 | Specified by purchaser | 58.00 | 61.12 | 0.62 | 8.75 | 14.56 | 4640 |
| 60 | 78.50 | 71.75 | 65.25 | 28 | 3.62 | Specified by purchaser | 60.00 | 63.38 | 0.69 | 9.19 | 15.31 | 5000 |
Notes:
All dimensions are in inches.
These flanges are furnished with a 1/4" Raised Face unless otherwise specified.
Bore dimensions are specified by the purchaser.
Alternative flange facings and customized machining can be supplied according to customer requirements.
Welding Neck Flange
A Welding Neck Flange has a tapered neck and is connected directly to the pipe by butt welding.
The tapered hub helps distribute stress gradually from the flange to the pipe, providing a strong and stable connection.
Welding Neck Flanges are suitable for applications involving:
High pressure
High temperature
Vibration
Cyclic loading
Hazardous process media
Large-diameter transmission pipelines
The reference page notes that Welding Neck Flanges are commonly used in oil transportation pipelines, ship piping systems, and chemical raw-material transportation because of their structural strength, sealing performance, and ability to withstand high temperature and pressure.
Advantages of ASME B16.47 Series A Class 600 Welding Neck Flanges
High Structural Strength
The tapered hub provides a strong transition between the flange and pipe.
Reliable Sealing
Precision-machined sealing surfaces provide dependable gasket contact.
Good Fatigue Resistance
The butt-welded design helps reduce stress concentration under vibration and pressure changes.
Suitable for Heavy-Duty Systems
Class 600 Welding Neck Flanges are suitable for demanding large-diameter industrial piping systems.
Multiple Material Options
Carbon steel, stainless steel, alloy steel, and duplex stainless steel are available.
Applications
Oil and Gas Industry
Used in oil and gas transmission pipelines, compressor stations, refineries, and processing facilities.
Petrochemical Industry
Suitable for process piping, pressure vessels, heat exchangers, pumps, and valves.
Chemical Processing
Used in pipelines transporting chemicals, gases, and industrial process media.
Power Generation
Applied in steam, cooling water, process water, and auxiliary piping systems.
Offshore and Marine
Used in offshore platforms, marine piping, seawater systems, and oil and gas production facilities.
Industrial Piping
Suitable for heavy industrial plants, pressure equipment, machinery, pumps, valves, and large pipeline systems.
PRODUCTION PROCESS
Our ASME B16.47 Series A Class 600 Welding Neck Flanges are manufactured through a controlled production process.
Raw Material Inspection → Cutting → Heating → Forging → Heat Treatment → Rough Machining → CNC Machining → Drilling → Beveling → Inspection → Surface Treatment → Marking → Packing
Each production stage is controlled to ensure accurate dimensions, stable material properties, correct bolt-hole arrangements, and reliable sealing surfaces.
Why Choose Us
Experienced Manufacturer
We specialize in forged flange manufacturing for industrial piping systems.
Reliable Quality
Each flange is inspected before shipment.
Multiple Material Options
Carbon steel, stainless steel, alloy steel, and duplex stainless steel are available.
Custom Manufacturing
Customized sizes, bores, facings, coatings, and markings can be supplied.
International Supply
We supply flange products to customers in different industries and global markets.
COMPANY PROFILE
Shanxi HongKai Forging Co., Ltd. is located in Dingxiang County, Shanxi Province, China, an important manufacturing base for forged flanges.
We specialize in the production of forged flanges and industrial forging products for international piping and engineering projects.
Our manufacturing capabilities include:
Forging, Heat Treatment, CNC Machining, Drilling, Testing, Surface Treatment, Marking, Packaging and Shipment.
We manufacture Welding Neck Flanges, Blind Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Lap Joint Flanges, and customized forged flanges.
Our products can be supplied according to:
ASME / ANSI / EN / DIN / JIS / AWWA / BS and other international standards.
Available materials include carbon steel, stainless steel, alloy steel, duplex stainless steel, and special material grades.
FAQ
What is an ASME B16.47 Series A Class 600 Welding Neck Flange?
It is a large-diameter flange with a tapered hub that is butt welded directly to the pipe and manufactured according to ASME B16.47 Series A Class 600 dimensional requirements.
What sizes are available?
The reference table covers NPS 26" to NPS 60".
What does Class 600 mean?
Class 600 is an ASME pressure-temperature class designation. Actual allowable working pressure depends on the material, operating temperature, gasket, bolting, and overall system design.
What materials are available?
Common materials include carbon steel, stainless steel, alloy steel, and duplex stainless steel.
What flange facing is normally supplied?
The reference page states that these flanges are furnished with a 1/4" Raised Face unless otherwise specified.
Why use a Welding Neck Flange?
Its tapered hub and butt-welded connection provide strong mechanical performance, good stress distribution, and reliable sealing.
Can the bore be customized?
Yes. The bore is specified by the purchaser according to the mating pipe and project requirements.
Where are Class 600 Welding Neck Flanges used?
They are commonly used in oil and gas, petrochemical, power generation, chemical processing, marine, and other heavy-duty piping systems.
Can customized flanges be manufactured?
Yes. Customized dimensions, bores, facings, materials, coatings, markings, and inspection requirements can be supplied.
Can inspection certificates be supplied?
Yes. Material certificates, dimensional reports, UT, MT, PMI, hardness testing, and third-party inspection documentation can be provided when required.
Contact Us
Looking for reliable ASME B16.47 Series A Class 600 Welding Neck Flanges?
Contact our technical team for dimensional confirmation, material selection, customized manufacturing, and quotations.
Shanxi HongKai Forging Co., Ltd.
Address: Cuijiazhuang Industrial Park, Dingxiang County, Shanxi Province, China
Telephone: +86 13716747092
Email: kevin.zhao@hkflange.com
Clear Communication, and Reliable Technical Support