Weld Neck Flange Manufacturer & Supplier in India

Hi-Tech Engineering is a Weld Neck Flange Manufacturer & Supplier in India, offering forged weld neck flanges for high-pressure and high-temperature piping systems across various industries. We supply carbon steel, stainless steel, and alloy steel weld neck flanges in accordance with international standards such as ASME, ANSI, DIN, EN, and JIS.

Weld neck flanges are widely used in oil & gas pipelines, power plants, refineries, petrochemical facilities, pressure vessels, and process industries where strength and reliability are critical. Available in multiple sizes, pressure ratings, and material grades, our weld neck flanges are supplied to meet both standard and project-specific requirements. Custom dimensions and machining can also be provided as per customer drawings.

What is a Weld Neck Flange?

A Weld Neck Flange (WN Flange) is a forged pipe flange designed with a long tapered hub that is butt-welded directly to the pipe. The tapered neck provides a gradual transition between the pipe and flange, helping distribute stress evenly throughout the connection.

Due to its superior strength and resistance to pressure, temperature fluctuations, and cyclic loading, the Weld Neck Flange is widely used in critical piping systems across oil & gas, power generation, petrochemical, refinery, and process industries. It is considered one of the most reliable flange types for high-pressure and high-temperature applications where safety and long service life are essential.

Types of Weld Neck Flanges

Raised Face Weld Neck Flange (WNRF)

Raised Face Weld Neck Flanges are the most commonly used type in industrial piping systems. The raised sealing surface improves gasket compression and helps achieve reliable leak-tight performance in medium and high-pressure applications.

Ring Type Joint Weld Neck Flange (WNRTJ)

Ring Type Joint Weld Neck Flanges are designed for severe service conditions involving high pressure and high temperatures. These flanges utilize metallic ring gaskets to provide superior sealing performance in critical applications such as refineries, offshore platforms, and petrochemical plants.

Flat Face Weld Neck Flange (WNFF)

Flat Face Weld Neck Flanges feature a flat sealing surface and are generally used in low-pressure systems or where mating equipment has a flat face connection. They are commonly installed on cast iron valves, pumps, and other equipment requiring full-face contact.

Technical Specifications

Available Material Grades

ASME B16.5 Weld Neck Flanges

ASME B16.5 Weld Neck Flanges are supplied in multiple sizes, pressure ratings and material grades. These flanges are manufactured according to ASME dimensional standards to ensure interchangeability and reliable performance in industrial piping systems.

Class 150 to Class 2500 Weld Neck Flanges

We supply Weld Neck Flanges in Class 150, 300, 400, 600, 900, 1500 and 2500 pressure ratings. Selection of the pressure class depends upon operating pressure, temperature and service conditions of the piping system.

Carbon Steel Weld Neck Flanges

We supply Carbon Steel Weld Neck Flanges in ASTM A105, ASTM A350 LF2 and ASTM A694 grades for high-pressure piping systems, refineries, power plants and oil & gas applications. Carbon steel weld neck flanges offer excellent strength, durability and cost-effective performance for industrial piping installations.

Stainless Steel Weld Neck Flanges

Stainless Steel Weld Neck Flanges are available in ASTM A182 F304, F304L, F316 and F316L grades. These flanges are widely used in chemical processing, food processing, pharmaceutical and corrosive service applications where superior corrosion resistance is required.

Alloy Steel Weld Neck Flanges

We also supply Alloy Steel Weld Neck Flanges in ASTM A182 F11, F22 and F91 grades for elevated temperature and high-pressure applications commonly found in power generation and petrochemical industries.

Applications & Industries Served

Weld Neck Flanges are widely used in demanding industrial environments where high mechanical strength and leak-free performance are required.

Dimensions & Weight Chart

Weld Neck Flange dimensions and weights vary depending on the pressure class, material grade, facing type, and applicable standard. Hi-Tech Engineering supplies Weld Neck Flanges in accordance with ASME B16.5, ASME B16.47 Series A & B, DIN, EN 1092-1, and JIS standards. Standard sizes are available from 1/2" NB to 60" NB with pressure ratings ranging from Class 150 to Class 2500.

The dimensional requirements of a Weld Neck Flange include outside diameter (OD), flange thickness, bolt circle diameter (BCD), number of bolt holes, hub dimensions, bore size, and facing details. Accurate dimensions are essential for proper gasket seating, leak-free performance, and reliable operation in high-pressure and high-temperature piping systems.

We supply Carbon Steel, Stainless Steel, and Alloy Steel Weld Neck Flanges in various sizes and pressure ratings for oil & gas, petrochemical, refinery, power generation, chemical processing, and heavy engineering applications. Custom dimensions and machining can also be provided according to customer drawings and project specifications.

Inspection, Testing & Certification

Every weld neck flange is supplied with strict quality control measures to ensure dimensional accuracy, material compliance, and project-specific requirements.

Apart from forged flanges, we also manufacture forged rings, forged shafts, and forging hammers for industrial applications.

For more information or to discuss your requirements, Contact us now for the best price and fast delivery. Call +91 9555009232 or email info@hitech-engineering.in.

Frequently Asked Questions (FAQ)