Weld Neck
Flanges Manufacturer

At Steel Icon Stainless Pvt. Ltd., we specialize in the manufacturing and supply of top-quality weld neck flanges, designed for high-pressure and high-temperature applications. Our flanges are crafted from premium stainless steel and meet international standards such as ASTM, ASME, DIN, EN, and ANSI.

With a long tapered hub that strengthens the connection between the pipe and flange, our weld neck flanges ensure superior strength, smooth flow, and excellent resistance to stress concentrations. These features make them the perfect choice for critical service piping systems where reliability and performance are essential.

What is a Weld Neck Flange?

A weld neck flange (often referred to as a WN flange) is a specialized flange with a long beveled neck designed to be butt-welded to the pipe. The neck offers reinforcement and ensures a smooth transition of pressure from the flange to the pipe wall, reducing turbulence and preventing erosion at the flange joint. This makes it highly effective in maintaining system integrity under high pressure. Weld neck flanges are widely used in demanding environments such as chemical and petrochemical industries, marine applications, 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
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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 diverse range of flanges, each tailored for different piping applications:

  • Weld Neck Flanges – Offering high strength and reducing stress concentration, making them ideal for high-pressure pipelines.

  • Slip-On Flanges – Easy to install, commonly used in low-pressure fluid transport systems.

  • Blind Flanges – Designed to seal the ends of piping systems, preventing leakage and fluid loss.

  • Socket Weld Flanges – Perfect for small-diameter and high-pressure piping systems.

  • Threaded Flanges – Allow for quick installation without the need for welding, offering convenience in various applications.

  • Lap Joint Flanges – Ideal for systems that require frequent disassembly and inspection, providing flexibility and ease of maintenance.

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.
Ask A Question >
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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