Hastelloy Weld Neck Flanges Manufacturer and Supplier In India

A Hastelloy weld neck flange is a special type of flange made from Hastelloy alloys, which are known for their exceptional corrosion resistance. Hastelloy weld neck flange is a circular flange manufactured with a long tapered neck (also known as a hub) that is welded to the pipe. The design of the weld neck flange helps provide additional structural support and reduces stress concentration at the base of the flange. It also offers a smooth shift from the pipe to the flange, which can help prevent turbulence and erosion inside the piping system. Hastelloy weld neck flanges are used in various industries and applications where resistance to corrosion, high temperatures, and mechanical strength are important. They are semiconductor industry, offshore and marine, power generation, chemical Processing and many more.

Naysha Steel is a leading manufacturer and supplier of Hastelloy Flanges in Mumbai, India. With a strong focus on quality and reliability, they provide high-grade flanges that meet international standards. Their products are known for their exceptional corrosion resistance and durability, making them ideal for demanding industrial applications. Naysha Steel's comprehensive range of Hastelloy Weld Neck Flanges caters to diverse customer requirements. Backed by a skilled workforce and state-of-the-art infrastructure, they ensure timely delivery and excellent customer service. Choose Naysha Steel for top-notch Hastelloy Weld Neck Flanges in India.

hastelloy weld neck flanges manufacturer

Types of Hastelloy Weld Neck Flanges

Weld neck flanges are ideal for high-pressure and high-temperature applications and offer excellent resistance to leakage. They are easy to install and are commonly used in low-pressure applications. They are typically used to isolate sections of a pipeline or for maintenance purposes. Blind flanges do not have a bore and are available in various thicknesses. Socket weld flanges provide a smooth bore and excellent flow characteristics, making them suitable for applications where fluid flow is critical.

  • Standard Weld Neck Flanges: These flanges have a long tapered neck that is welded to the pipe, providing a strong and stable connection.
  • Long Weld Neck Flanges: Long weld neck flanges have an extended neck length, offering additional reinforcement and flexibility in piping systems.
  • Reducing Weld Neck Flanges: Reducing weld neck flanges have a larger bore on one end and a smaller bore on the other end.
  • Compact Weld Neck Flanges: Compact weld neck flanges have a shorter neck length compared to standard weld neck flanges.
  • High-Hub Weld Neck Flanges: High-hub weld neck flanges have a taller neck height compared to standard weld neck flanges.

Features of Hastelloy Weld Neck Flanges

  • Hastelloy weld neck flanges exhibit excellent corrosion resistance, making them suitable for applications in harsh and corrosive environments.
  • Socket weld flanges offer a strong and secure joint. The socket-like end of the flange fits over the pipe, and the connection is welded, providing a robust and leak-resistant connection.
  • Hastelloy weld neck flanges offer exceptional mechanical strength, ensuring the integrity and reliability of the piping system.
  • Hastelloy Weld neck flanges are specifically designed for welding to the pipe, providing a strong and durable joint.
  • The weld neck design of these flanges provides a smooth transition from pipe to flange, minimizing the risk of leaks or fluid escape.

Size of Hastelloy Weld Neck Flanges

Nominal Size Outside Diameter
Min. Thickness
RF Dia.
No. of Bolt Holes Diameter of Holes Bolt Circle
SO Bore ID
WN Bore ID
Dia. Hub Base
Dia. of Hub Top
12 3.50 0.38 1.38 4 0.62 2.38 0.88 0.62 1.19 0.84 0.56 1.81
34 3.88 0.44 1.69 4 0.62 2.75 1.09 0.82 1.50 1.05 0.56 2.00
1 4.25 0.50 2.00 4 0.62 3.12 1.36 1.05 1.94 1.32 0.62 2.12
114 4.62 0.56 2.50 4 0.62 3.50 1.70 1.38 2.31 1.66 0.75 2.19
112 5.00 0.62 2.88 4 0.62 3.88 1.95 1.61 2.56 1.90 0.81 2.38
2 6.00 0.69 3.62 4 0.75 4.75 2.44 2.07 3.06 2.38 0.94 2.44
212 7.00 0.81 4.12 4 0.75 5.50 2.94 2.47 3.56 2.88 1.06 2.69
3 7.50 0.88 5.00 4 0.75 6.00 3.57 3.07 4.25 3.50 1.12 2.69
312 8.50 0.88 5.50 8 0.75 7.00 4.07 3.55 4.81 4.00 1.19 2.75
4 9.00 0.88 6.19 8 0.75 7.50 4.57 4.03 5.31 4.50 1.25 2.94
5 10.00 0.88 7.31 8 0.88 8.50 5.66 5.05 6.44 5.56 1.38 3.44
6 11.00 0.94 8.50 8 0.88 9.50 6.72 6.07 7.56 6.63 1.50 3.44
8 13.50 1.06 10.62 8 0.88 11.75 8.72 7.98 9.69 8.63 1.69 3.94
10 16.00 1.12 12.75 12 1.00 14.25 10.88 10.02 12.00 10.75 1.88 3.94
12 19.00 1.19 15.00 12 1.00 17.00 12.88 12.00 14.38 12.75 2.12 4.44
14 21.00 1.31 16.25 12 1.12 18.75 14.14 13.25 15.75 14.00 2.19 4.94
16 23.50 1.38 18.50 16 1.12 21.25 16.16 15.25 18.00 16.00 2.44 4.94
18 25.00 1.50 21.00 16 1.25 22.75 18.18 17.25 19.88 18.00 2.62 5.44
20 27.50 1.62 23.00 20 1.25 25.00 20.20 19.25 22.00 20.00 2.81 5.62
22 29.50 1.75 25.25 20 1.38 27.25 22.22 21.25 24.25 22.00 3.07 5.82
24 32.00 1.81 27.25 20 1.38 29.50 24.25 23.25 26.12 24.00 3.19 5.94

Uses of Hastelloy Weld Neck Flanges

One common application of weld neck Hastelloy flanges is in the chemical processing industry. They are used in chemical plants and refineries where the handling of corrosive substances such as acids, alkalis, and strong chemicals is prevalent. The corrosion resistance of Hastelloy alloys combined with the weld neck design ensures a reliable and leak-proof connection, preventing any potential leaks or contamination.

Quality of Hastelloy Weld Neck Flanges

First and foremost, the choice of materials is crucial. provides excellent mechanical strength and corrosion resistance, while Hastelloy alloys offer exceptional resistance to a wide range of corrosive media, including acids, alkalis, and harsh chemicals. The combination of these materials ensures that the flanges can withstand the corrosive and high-temperature conditions often encountered in industries such as chemical processing, oil and gas, and power generation.

Hastelloy Weld Neck Flanges Manufacturer : Grades & Classes

  • Hastelloy C276
  • Hastelloy C22
  • Hastelloy B2
  • Hastelloy X
  • Hastelloy G30
  • Class 150
  • Class 300
  • Class 600
  • Class 900
  • Class 1500
  • Class 2500

Hastelloy WeldNeck Flanges Specifications

Specification Of : Hastelloy Weld Neck Flange
JIS Standards 5K, 10K, 40K, 16K 20K 30K, 63K
Size Of Bore Diameter Flange NPS ≤ 10
Manufacturer Of Standard Dimensions EN-1092 Flange, ASME B16.48 Flange, API605 Flange, BS4504 Flange, EN1092 Flange, UNI Flange, ISO Flange, API7S-43 Flange, ANSI/ASME B16.5 Flange, API7S-15 Flange, MSS S44 Flange, IS 2062 Flange, ASME B16.36 Flange, DIN Flange, AWWA C207 Flange, B16.47 Series A & B Flange, BS1560-3.1 Flange, ISO70051 Flange, API Flange.
Minimum Pressure 150# To 2500#
Flange Face Type Raised Face, Groove And Small Tongue Groove, RTJ, Flat Face, Large Tongue & Large Male-Female And Small Male-Female, Lap-Joint Face.
Top Six Type Of Flange Threaded Flange, Lap Joint Flange, Socket-Weld Flange, Blind Flange, Slip-On Flange, Weld Neck Flange
Standard Materials Duplex Steel & Super Duplex Steel, Copper Nickel, Wrought Iron, Inconel, Mild Steel, Stainless Steel, Hastelloy, Cast Iron, Alloy Steel, Carbon Steel.
Thickness Length NPS ≤ 18
Size (1/2") To (48")
Manufacturing Process Forged/ Machined/ Heat Treated
Other Type Of Flange Forged/ Plate/ Threaded
Application Oil And Gas Industry
Power Plants Industry
Food Processing And Manufacturing
Waterworks Systems
Fossil Fuel Power Plants
Nuclear Power Application
Municipal Pipe Systems

Please find below our manufacturing and Sales network below: (Contact us for detailed information for your nearest branches)

  • Hastelloy Weld Neck Flanges manufacturer and contractor in Hyderabad
  • Hastelloy Weld Neck Flanges manufacturer and supplier in Chennai
  • Hastelloy Weld Neck Flanges manufacturer and stockists in Pune
  • Hastelloy Weld Neck Flanges manufacturer and dealer in Faridabad
  • Hastelloy Weld Neck Flanges manufacturer and warehousing in Chandigarh
  • Hastelloy Weld Neck Flanges manufacturer and wholesalor in Delhi
  • Hastelloy Weld Neck Flanges manufacturer and trader in Coimbatore
  • Hastelloy Weld Neck Flanges manufacturer and stockholder in Bangalore

Frequently Asked Questions

What is a Hastelloy weld neck flange?

A Hastelloy weld neck flange is a type of pipe flange designed to be butt-welded to the end of a pipe. It features a long neck that extends from the flange, which provides an excellent and strong connection.

How are Hastelloy weld neck flanges installed?

Installation involves butt-welding the flange to the pipe's end, creating a strong, permanent connection. Proper welding procedures and techniques are essential to ensure a reliable, leak-free joint.

What are the standard sizes available for Hastelloy weld neck flanges?

Hastelloy weld neck flanges are available in various sizes, typically ranging from small diameters to larger ones, depending on the requirements of the piping system.

Are there any specific standards or specifications that govern the manufacturing of Hastelloy weld neck flanges?

The manufacturing of Hastelloy weld neck flanges should adhere to industry standards such as ASME B16.5, ASME B16.47, and ASTM B462. Compliance with these standards ensures proper design and performance

Industries served by Hastelloy Weld Neck Flanges

In the oil and gas industry, blind Alloy Steel flanges are used in pipelines, storage tanks, and offshore platforms. They are employed for closing off openings during maintenance, repair, or when a branch connection is not required. Petrochemical plants utilize blind Alloy Steel flanges in equipment such as reactors, distillation columns, and storage vessels. These flanges provide a secure and leak-proof seal when closing off unused openings or isolating sections of the process.

oil gas manufacturer
Oil and Gas Industries

The oil and gas industry includes a wide range of from drilling and production to refining and marketing. Some of the major players in this include oil and gas companies, service providers, equipment.

petroleum manufacturer supplier
Petroleum Industries

In the drilling process, stainless steel is used to make drill bits, pipes, and other equipment that must withstand high pressures and temperatures. Stainless steel is also used to make pumps, valves, and fittings for the transportation.

chemical flanges
Shipbuilding in India

In storage applications, stainless steel is used to make tanks and containers that can safely store corrosive and hazardous chemicals. It is also used in piping systems for chemical transfer and distribution chemical industry.

Marking & Pricing

Products are packaged to ensure that there is no damage during of goods transport. In case of exports, standard export packaging is done with utmost care in wooden covering or boxing. All products are marked with Grade, Lot No, Size, Degree and our trade mark. On special requests we can also, make customized marking on our products.

Quality Assurance

At Naysha Steel, all fittings and flanges are subject to strict inspection at each and every stage of the production process, from starting material purchasing to product dispatch. They are visually examined for compliance to ASTM, ASME, MSS, DIN, EN, and JIS codes and standards. Upon request, official certified Inspection Agencies can be called in to witness the material reports, dimensions and quality compliance of products.

Test Certificates: Manufacturer Test Certificate as per EN 10204 / 3.1B Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report