Weld Neck
Flanges Manufacturer
At Steel Icon Stainless Pvt. Ltd., we specialize in the manufacturing and supply of premium-grade weld neck flanges, engineered for high-pressure and high-temperature applications. Our flanges are manufactured using high-quality stainless steel, and conform to international standards such as ASTM, ASME, DIN, EN, and ANSI.
Designed with a long tapered hub that reinforces the connection between pipe and flange, weld neck flanges ensure superior strength, seamless flow, and excellent resistance to stress concentrations—making them ideal for critical service piping systems.
What is a Weld Neck Flange?
A weld neck flange (also known as WN flange) is a type of flange with a long beveled neck that is butt-welded to the pipe. This neck provides reinforcement and smooth transition of pressure from the flange to the pipe wall, which reduces turbulence and erosion at the flange joint. It is commonly used in extreme environments, including chemical, petrochemical, marine, power generation, and high-temperature processing units.
| Products |
|---|
|
Stainless Steel Bar |
|
Fasteners |
|
Forged Products |
|
Flanges |
|
Forged Fittings |
|
Stainless Steel Billets |
|
Round Corner Square Billets |
|
Stainless Steel Pipes |
|
Pipe Fittings |
|
Valve |
Weld Neck Flanges Specifications
| Property | Specification |
|---|---|
|
Material Grades |
SS 304, SS 316, SS 321, SS 347, SS 410, Duplex 2205
|
|
Sizes |
½” to 48” (DN 15 to DN 1200) |
|
Pressure Ratings |
Class 150, 300, 600, 900, 1500, 2500 |
|
Face Types |
RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) |
|
Standard Compliance |
ASTM A182 / A240, ASME B16.5, B16.47, DIN 2631–2635, EN 1092-1 |
|
Manufacturing Process |
Forged / CNC Machined / Heat Treated |
|
Finish |
Shot blasted, machined, passivated, anti-rust coated |
|
Standards & Compliance |
ASTM A193, ASTM A320, DIN 931, DIN 933, IS 1367 |
Stainless Steel Grades & Equivalent Standards
| Grade | UNS | EN / WNR |
|---|---|---|
|
SS 304 |
S30400 |
1.4301 / X5CrNi18-10 |
|
SS 316 |
S31600 |
1.4401 / X5CrNiMo17-12-2 |
|
SS 321 |
S32100 |
1.4541 / X6CrNiTi18-10 |
|
SS 410 |
S41000 |
1.4006 / X12Cr13 |
|
Duplex 2205
|
S31803 / S32205 |
1.4462 |
Chemical Composition (Typical – SS 304 / SS 316)
| Element | SS 304 (%) | SS 316 (%) |
|---|---|---|
|
Carbon (C) |
0.08 max |
0.08 max |
|
Manganese (Mn) |
2.00 max |
2.00 max |
|
Silicon (Si) |
1.00 max |
1.00 max |
|
Chromium (Cr) |
18.0 – 20.0 |
16.0 – 18.0 |
|
Nickel (Ni) |
8.0 – 10.5 |
10.0 – 14.0 |
|
Molybdenum (Mo) |
— |
2.00 – 3.00 |
Mechanical Properties
| Property | SS 304 / SS 316 |
|---|---|
|
Tensile Strength |
515 – 750 MPa |
|
Yield Strength |
205 – 310 MPa |
|
Elongation (%) |
≥ 40% |
|
Hardness (HRB) |
≤ 95 |
|
Working Temp Range |
-200°C to 870°C |
|
Pressure Handling |
Up to Class 2500 available |
Types of Flanges
We manufacture and supply a wide variety of flanges, designed for different piping applications:
- Weld Neck Flanges – Provides high strength and reduces stress concentration in high-pressure pipelines.
- Slip-On Flanges – Easy to install and commonly used in low-pressure fluid transport systems.
- Blind Flanges – Used to seal the ends of piping systems, ensuring no leakage or fluid loss.
- Socket Weld Flanges – Ideal for small-diameter and high-pressure piping systems.
- Threaded Flanges – Allows for quick installation without welding.
- Lap Joint Flanges – Suitable for systems that require frequent disassembly and inspection.
Applications of Weld Neck Flanges
Construction &
Infrastructure
Marine &
Offshore
Automotive &
Transportation
Manufacturing &
Heavy Equipment
Chemical &
Pharmaceutical Plants
Oil & Gas
Food & Beverage
Industry
Frequently Asked Questions
Explore our FAQs for insights on materials, customization, and delivery.
What makes weld neck flanges suitable for high-pressure systems?
The tapered neck and butt weld connection evenly distribute stress, making them ideal for high-pressure and high-temperature environments.
What is the difference between a standard and long weld neck flange?
Long weld neck flanges have an extended hub and are used mainly for equipment nozzle connections and pressure vessel designs.
Can weld neck flanges be customized in face type and material?
Yes, we offer custom face options (RF, FF, RTJ) and material grades to suit your application.
Do you supply documentation and test certificates?
Absolutely. We provide Mill Test Certificates (MTC), third-party inspections, and compliance documents upon request.
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