Weld Neck Flanges
Stellanox Steel manufactures and supplies premium-grade Weld Neck Flanges designed for high-pressure, high-temperature, and critical-service piping systems. Precision-engineered from materials like Stainless Steel, Carbon Steel, Alloy Steel, Inconel, Monel, Hastelloy, Titanium, and Nickel Alloys, our weld neck flanges offer leak-proof integrity, smooth stress distribution, and superior weldability.
Conforming to international standards such as ASME B16.5, B16.47, EN 1092-1, and DIN, our weld neck flanges are trusted in oil & gas, petrochemical, power generation, chemical processing, and offshore platforms.
What are Weld Neck Flanges?
Weld Neck Flanges (WN Flanges) are long-tapered hub flanges designed to be butt-welded to a pipe, ensuring smooth transition and excellent stress distribution in high-stress, vibration-prone or fluctuating temperature systems. The tapered hub strengthens the connection and minimizes concentration of pressure, making them ideal for critical fluid handling systems.
These flanges are typically used in applications where reliability and performance are essential, especially in long-term service under extreme conditions.
| Products |
|---|
|
Stainless Steel |
|
Carbon Steel |
|
Duplex Stainless Steel |
|
Super Duplex Stainless Steel |
|
Alloy Steel |
|
Titanium |
|
Hastelloy |
|
Inconel |
|
Monel |
|
Aluminium |
|
Copper |
|
Pure Nickel |
|
Flanges |
|
Forged Fittings |
|
Valves |
|
Fasteners |
Key Features
Ideal for High-Pressure & High-Temperature Environments
Full Penetration Butt Weld Ensures Structural Integrity
Tapered Hub Reduces Stress Concentration
Suitable for Repeated Bending, Thermal Cycling, and Vibration
Available in Raised Face (RF), Ring Type Joint (RTJ), and Flat Face (FF)
Compliant with ASME, EN, DIN, ISO, and BS Standards
Specification
| Property | Details |
|---|---|
|
Sizes Available
|
½” NB to 60” NB (DN15 – DN1500) |
|
Pressure Ratings
|
Class 150 to Class 2500
|
|
Face Types |
RF, FF, RTJ |
|
Bore Types |
Standard Bore, Heavy Bore, Extra Bore |
|
Standards |
ASME B16.5, B16.47, EN 1092-1, DIN 2633, ISO 7005 |
|
Materials |
SS 304/316, CS A105, Alloy Steel F11/F22, Inconel, Monel, Hastelloy |
|
Heat Treatment |
Normalized, Annealed, Quenched & Tempered |
|
Testing & Certification |
EN 10204 3.1/3.2, Hydrotest, NDT, PMI, Ultrasonic, CE, PED, NACE |
Materials and Equivalent Grades
| Material | Grades (ASTM/UNS) |
|---|---|
|
Stainless Steel |
304, 304L, 316, 316L, 321 |
|
Carbon Steel |
ASTM A105, A350 LF2 |
|
Alloy Steel |
A182 F11, F22, F91
|
|
Nickel Alloys |
Inconel 600/625, Monel 400 |
|
Titanium |
Grade 2, Grade 5 |
Weight
| Size (inches) | Approx. Weight (kg) | Pressure Class | Standard |
|---|---|---|---|
|
2″
|
3.80 |
150# |
ANSI B16.5 |
|
4″ |
8.70 |
150# |
ANSI B16.5 |
|
6″ |
16.20 |
150#
|
ANSI B16.5 |
|
8″
|
27.60 |
150# |
ANSI B16.5 |
|
10″ |
39.90 |
150# |
ANSI B16.5 |
Applications
Oil & Gas Refineries: Pipeline terminations, pressure vessels
Petrochemical Plants: Reactor connections, thermal exchange systems
Power Generation: Superheated steam systems, condensate lines
Marine Systems: High-pressure seawater and bilge lines
Nuclear & Aerospace: Reactor piping, fuel systems
Pharmaceutical & Sanitary Systems: High-purity flow piping
Benefits
Leak-Proof & High-Integrity Connections
Minimized Pressure Drop & Flow Disruption
Withstands Fluctuating Loads and Repetitive Stress
Improved Fatigue Resistance in Critical Installations
Precision Machined with Tight Dimensional Tolerances
Fully Traceable with Global Certifications
2025 Stellanox Steel |