✅ Stainless Steel Weld Neck Flange – High Performance Industrial Pipe Flanges

SSM supplies premium quality Weld Neck Flanges (WN Flanges), designed for high-strength pipe connections, excellent stress distribution, and reliable sealing performance in high-pressure, high-temperature, and critical piping systems.

Manufactured from high-quality carbon steel, stainless steel, and alloy steel materials, these flanges provide excellent mechanical strength, superior fatigue resistance, and long service life in demanding operating environments. The long tapered hub and butt weld connection design provide a smooth transition between the flange and pipe, reducing stress concentration and improving overall pipeline integrity.

With precision forging, advanced machining, and strict quality control, Stainless Steel Weld Neck Flanges ensure secure connections between pipes, valves, pumps, and pressure equipment while meeting international standards and customized engineering requirements.

✅ Product Overview

A Weld Neck Flange (WN Flange) is a high-performance pipe flange with a long tapered neck that is directly welded to the pipe using a butt welding process.

Unlike slip-on flanges, the weld neck design transfers stress gradually from the flange to the pipe, making it suitable for systems involving high pressure, high temperature, cyclic loading, and severe service conditions.

Weld neck flanges are widely used in industries requiring maximum connection reliability, including oil & gas, petrochemical, power generation, chemical processing, and pressure vessel applications.

✅ Key Features

Product Type:
Weld Neck Flange / WN Flange / Butt Weld Neck Flange

Material:
Carbon Steel: ASTM A105 / A350 LF2
Stainless Steel: ASTM A182 F304 / F304L / F316 / F316L
Alloy Steel: ASTM A182 F5 / F11 / F22 / F91 (Available Options)

Standard:
ASME B16.5 / ASME B16.47 / EN 1092-1 / DIN / JIS / GOST / Custom Standards

Facing Type:
Raised Face (RF) / Flat Face (FF) / Ring Type Joint (RTJ)

Connection Type:
Butt Weld Connection

Manufacturing Process:
Forging / Heat Treatment / CNC Machining

Pressure Rating:
Class 150 – Class 2500
PN6 – PN420 (According to Standard and Size)

Size Range:
1/2" – 60" (DN15 – DN1500)
(Custom Sizes Available)

Surface Finish:
Machined Finish / Anti-Rust Oil / Pickled & Passivated

⚙️ Advantages

✅ Excellent Stress Distribution

The tapered hub design provides a smooth transition between the pipe and flange, reducing stress concentration and improving fatigue resistance.

✅ Suitable for High Pressure and High Temperature

Weld neck flanges are ideal for demanding applications involving extreme pressure, temperature fluctuations, and mechanical loading.

✅ Strong Butt Weld Connection

The butt weld connection provides excellent structural integrity and creates a continuous flow path with minimal turbulence.

✅ High Mechanical Strength

Forged stainless steel, carbon steel, and alloy steel materials provide superior strength, durability, and resistance to deformation.

✅ Reliable Sealing Performance

Available with RF, FF, and RTJ facing options to meet different gasket requirements and sealing conditions.

✅ Long Service Life

High-quality materials and precision manufacturing ensure stable performance with reduced maintenance requirements.

🔧 Typical Material Properties – Stainless Steel 316L

📋 Technical Specifications

✅ Applications

Oil & Gas Industry

Used in pipelines, refineries, offshore platforms, and process systems requiring high-integrity flange connections.

Petrochemical Industry

Applied in reactors, heat exchangers, pressure vessels, and high-pressure process piping.

Power Generation Plants

Suitable for steam pipelines, boilers, turbines, and high-temperature systems.

Chemical Processing Facilities

Used in corrosive fluid systems requiring durable and reliable flange connections.

Marine Engineering

Applied in shipbuilding, offshore facilities, seawater piping, and marine process systems.

Pressure Vessel Equipment

Used for connecting pressure vessels, valves, pumps, and industrial equipment.

Industrial Piping Systems

Suitable for water, oil, gas, steam, and other process fluid transportation systems.

⚠️ Installation Notes

Weld neck flanges should be installed by qualified welding procedures to ensure weld quality.

Pipe schedule and flange bore should match the connected piping system.

Proper gasket selection and bolt tightening procedures are required for reliable sealing.

Welding inspection such as visual inspection, NDT, or PMI testing may be required according to project specifications.

✅ Why Choose SSM

Over 30 years of experience in flange and pipe fitting manufacturing

Professional production according to ASME, ASTM, API, EN, and DIN standards

Complete material traceability with MTC / EN10204 3.1 certification

Supply of carbon steel, stainless steel, alloy steel, and special alloy flanges

Advanced forging, heat treatment, CNC machining, and inspection capabilities

Customized sizes, pressure classes, facing types, and drilling patterns available

Strict quality control ensures dimensional accuracy and reliable performance

Reliable global supply capability with professional technical support

📩 Request A Quote

SSM can supply Weld Neck Flanges (WN Flanges) in various materials, sizes, pressure ratings, facing types, and drilling standards to meet industrial, high-pressure, and critical piping system requirements.

Contact SSM today for pricing, technical datasheets, material certificates, and worldwide shipping solutions.