Weld Neck Flange (WN Flange)

1️⃣ Product Introduction

VikTech Fittings is a leading manufacturer, exporter, and supplier of high-quality Weld Neck Flanges (WN Flanges) manufactured in accordance with ASME standards including ASME B16.5 and ASME B16.47.

Weld Neck Flanges are designed with a long tapered hub that provides excellent reinforcement and stress distribution. The flange is butt-welded to the pipe, ensuring superior strength and leak-proof performance under high pressure and high temperature conditions.

Due to their structural integrity and reliability, Weld Neck Flanges are widely used in critical applications such as oil & gas, petrochemical plants, refineries, offshore platforms, power plants, and high-pressure piping systems.

2️⃣ Technical Specifications

Product Name      Weld Neck Flange (WN Flange)

Standards             ASME B16.5, ASME B16.47 Series A & B, EN 1092-1, DIN

Size                      Range½″ (DN15) to 60″ (DN1500)

Pressure Class     Class 150, 300, 400, 600, 900, 1500, 2500

Facing Types        RF, FF, RTJ

Bore Type             Standard Bore / Heavy Bore

Manufacturing       ForgedEnd ConnectionButt Weld (As per ASME B16.25)

Certification           EN 10204 3.1 / 3.2, IBR, PED (On Request)

3️⃣ Available Material Grades

▶ Carbon Steel (CS)

• ASTM A105

• ASTM A350 LF2

• ASTM A694 F42 / F52 / F60 / F65 / F70

▶ Mild Steel (MS)

• IS 2062 E250

• IS 2041

▶ Stainless Steel (SS)

• ASTM A182 F304 / 304L

• F316 / 316L

• F310

• F321

• F347

▶ Alloy Steel

• ASTM A182 F1

• F5, F9

• F11, F22

• F91

▶ Duplex & Super Duplex

• F51 (UNS S31803)

• F60 (UNS S32205)

• F53 (UNS S32750)

• F55 (UNS S32760)

▶ Nickel Alloys

• Inconel 600 / 625 / 800 / 825

• Monel 400

• Hastelloy C22 / C276

• Alloy 20

4️⃣ Size & Pressure Class Range

• Size: ½″ to 60″

• Pressure Ratings: Class 150 to 2500

• PN Ratings: PN6 to PN400

• Custom bore & thickness available

5️⃣ Standards & Compliance

• ASME B16.5 (Up to 24″)

• ASME B16.47 Series A & B (Above 24″)

• EN 1092-1

• DIN Standards

• ISO Certified

• IBR Approved Supply

• PED Compliant (Europe Projects)

6️⃣ Design & Dimensional Features

• Long tapered hub

• Smooth stress transition

• Butt weld connection

• Bore matches pipe ID

• Suitable for cyclic loading

Dimensional tolerances maintained strictly as per ASME standards for perfect alignment and sealing.

7️⃣ Manufacturing & Heat Treatment

• Closed die forging

• CNC machining

• Facing & drilling

• Serration machining

• Heat treatment (Normalizing / Q&T / Solution Annealing as required)

• Final inspection & marking

8️⃣ Pressure & Temperature Ratings

MaterialTemperature RangePressure ClassCarbon SteelUp to 425°CClass 150 – 2500Stainless SteelUp to 870°CPN6 – PN400Alloy SteelUp to 590°CClass 300 – 2500DuplexUp to 300°CHigh pressure service

(Refer ASME pressure-temperature chart for exact rating.)

9️⃣ Testing & Quality Control

✔ Hydrostatic Testing
✔ Ultrasonic Testing
✔ Radiography (On Request)
✔ PMI Testing
✔ Impact Testing (Low Temp Grades)
✔ Hardness & Tensile Testing
✔ Dimensional Inspection
✔ Third Party Inspection – TUV / BV / SGS / Lloyd’s
✔ 100% Heat Number Traceability

🔟 Applications & Industries

• Oil & Gas Pipelines

• Refineries

• Petrochemical Plants

• Power Plants

• Offshore & Marine

• High Pressure Steam Lines

• Chemical Processing

• LNG & Cryogenic Projects

Weld Neck Flanges are ideal for high-pressure, high-temperature, and critical service conditions.

1️⃣1️⃣ Surface Finish Options

• Anti-Rust Oil

• Black Coated

• Hot Dip Galvanized

• FBE Coating

• Epoxy Coating

• Zinc Coated

1️⃣2️⃣ Packing & Marking

• Wooden crates / fumigated pallets

• Face protectors

• Bubble wrapping

• Marking: Size, Grade, Class, Heat No., Standard

• Custom tagging as per project

• Seaworthy export packing

1️⃣3️⃣ Why Choose VikTech Fittings?

• Premium forged quality

• Accurate bore machining

• Strong project supply capability

• Fast dispatch for urgent shutdown jobs

• Competitive pricing

• Global export experience

• Complete documentation support

1️⃣4️⃣ SEO Keywords

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