ASME B16.47 Series B Class 75 Welding Neck Flange

Product Description

ASME B16.47 Series B Class 75 Welding Neck Flanges are designed for large-diameter piping systems requiring reliable welded connections and dimensional accuracy. These flanges feature a tapered hub that provides a gradual transition between the pipe and flange, helping distribute stress at the welded connection.

Manufactured in accordance with ASME B16.47 Series B requirements, these flanges are available in sizes NPS 26" to NPS 60". They are commonly used in oil and gas transportation, petrochemical processing, water transmission, power generation, and industrial piping systems.

Product Parameters

ASME B16.47 Series B Class 75 Welding Neck Flange Dimensions

ASME B16.47 Series B Class 75 Welding Neck Flanges

Choose The pressure class below

ASME B16.47 Series A

ASME B16.47 Series B

Weld Neck Flange

A Welding Neck Flange is a forged pipe flange featuring a long tapered hub and a butt-weld connection. Its design provides a smooth transition between the flange and pipe, helping reduce stress concentration.

These flanges are commonly used in industrial systems where welded joint integrity, reliable sealing, and long-term service performance are important.

Advantages of ASME B16.47 Series B Class 75 Welding Neck Flanges

Reliable Welded Connection

The butt-weld construction provides a continuous welded connection between the flange and pipe, supporting reliable pipeline operation.

Improved Stress Distribution

The tapered hub helps distribute mechanical stresses and reduces stress concentration around the welded joint.

Suitable for Large-Diameter Pipelines

Available in NPS 26" to NPS 60", these flanges are designed for large industrial piping systems.

Accurate Dimensions

Precision machining helps maintain consistent flange dimensions, bolt-hole arrangements, and gasket contact surfaces.

Multiple Material Options

Carbon steel, stainless steel, and alloy steel options can be supplied according to project requirements.

Applications

Oil and Gas Industry

Used for pipeline closure, isolation points, storage systems, and equipment connections.

Petrochemical Industry

Suitable for process piping, tanks, pressure vessels, pumps, valves, and heat exchangers.

Power Generation

Applied in cooling water systems, auxiliary piping, and other industrial pipeline systems.

Chemical Processing

Used to isolate pipelines carrying chemicals, gases, and process fluids.

Water and Utility Systems

Suitable for large-diameter water, utility, and general industrial pipelines.

Industrial Piping

Used in machinery, pressure equipment, pumps, valves, and large piping networks.

PRODUCTION PROCESS

Raw Material Inspection → Cutting → Heating → Forging → Heat Treatment → Rough Machining → CNC Machining → Drilling → Flange Facing → Inspection → Surface Treatment → Marking → Packing

Each manufacturing stage is controlled to achieve the required material properties, flange dimensions, bolt-hole alignment, and sealing surface finish.

Why Choose Us

Experienced Manufacturer

Shanxi HongKai Forging Co., Ltd. specializes in producing forged flanges for industrial piping applications.

Quality Control

Manufacturing and inspection procedures support dimensional accuracy, material traceability, and consistent product quality.

Customized Solutions

Materials, flange facings, bore dimensions, coatings, and other project-specific requirements can be reviewed for customized production.

International Supply

We provide forged flange solutions for customers in industrial piping and engineering 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 other special alloy grades.

 

 

 

 

 

 

FAQ

Q: What is an ASME B16.47 Series B Class 75 Welding Neck Flange?

A: It is a large-diameter flange with a tapered hub, designed for butt-weld connections in industrial piping systems.

Q: What sizes are available?

A: The reference table covers NPS 26" to NPS 60".

Q: What does Class 75 mean?

A: Class 75 is an ASME pressure-temperature class designation used for ASME B16.47 Series B flanges. Actual allowable working pressure depends on material, temperature, gasket, bolting, and system design.

Q: What materials are available?

A: Common materials include carbon steel, stainless steel, alloy steel, and duplex stainless steel.

Q: What is a Welding Neck Flange used for?

A: It is mainly used for welded pipe connections in oil and gas, petrochemical, power generation, and other industrial piping systems.

Contact Us

Looking for reliable ASME B16.47 Series B Class 75 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