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Forged Steel Weld Neck Flanges Manufacturer, Supplier & Exporter | DIPTI

Forged Steel Weld Neck Flanges Manufacturer, Exporter & Supplier

Introduction

DIPTI Metal Industries, founded in 2009 by Mr. Kumpsingh Rajput, is a globally recognized manufacturer, exporter, stockist, dealer, and supplier of Forged Steel Weld Neck Flanges. With state-of-the-art manufacturing facilities in Mumbai, India, and internationally recognized certifications, we provide high-quality flanges engineered to international standards.

Our Weld Neck Flanges are widely used in industries such as oil & gas, petrochemical, chemical, power generation, marine, water treatment, and offshore engineering. Designed to ensure a smooth bore and stress distribution, these flanges are ideal for high-pressure and high-temperature applications.

What are Weld Neck Flanges?

A Weld Neck Flange (WNRF) features a long tapered hub that provides reinforcement at the connection point, making it one of the most reliable flanges for severe service conditions. These flanges are welded to the pipe, ensuring leak-proof joints, superior fatigue resistance, and long service life.

  • Key Features:

    • Smooth transition from flange to pipe bore

    • Excellent resistance to dishing and stress concentration

    • Suitable for repeated bending due to long hub

    • Preferred in high-pressure, cryogenic, and elevated temperature service

International Standards for Weld Neck Flanges

We manufacture Weld Neck Flanges in compliance with all global standards, including:

  • ASME B16.5 (NPS 1/2” to 24”, Classes 150–2500)

  • ASME B16.47 Series A & B (NPS 26” to 60”)

  • MSS SP-44

  • API 605

  • BS 4504

  • DIN EN 1092-1

  • GOST 12820 / 12821

  • JIS B2220

  • ISO 7005

  • NORSOK L-005

  • Customized standards as per project specifications

Dimensions & Pressure Ratings

  • Size Range: ½” (15NB) to 60” (1500NB)

  • Pressure Ratings: Class 150, 300, 400, 600, 900, 1500, 2500 | PN6 to PN400

  • Facing Types: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)

Materials, Grades & International Equivalents

Our Weld Neck Flanges are available in all international grades and standards:

Stainless Steel Grades (ASTM A182 / A240)

  • 304 / 304L / 304H → UNS S30400 / S30403 / S30409 → EN 1.4301 / 1.4307 / 1.4948 → JIS SUS304

  • 316 / 316L / 316H / 316Ti → UNS S31600 / S31603 / S31609 / S31635 → EN 1.4401 / 1.4404 / 1.4571 → JIS SUS316

  • 309S / 310S → UNS S30908 / S31008 → EN 1.4833 / 1.4845

  • 317 / 317L → UNS S31700 / S31703 → EN 1.4449 / 1.4438

  • 321 / 321H → UNS S32100 / S32109 → EN 1.4541

  • 347 / 347H → UNS S34700 / S34709 → EN 1.4550

  • 904L → UNS N08904 → EN 1.4539

  • SMO 254 (6Mo) → UNS S31254 → EN 1.4547

Duplex & Super Duplex Steels (ASTM A182 / A240)

  • Duplex 2205 (F51 / F60) → UNS S31803 / S32205 → EN 1.4462

  • Super Duplex 2507 (F53 / F55) → UNS S32750 / S32760 → EN 1.4410

Carbon Steel (ASTM A105 / A350 / A694)

  • ASTM A105 / A105N → EN C22.8 / 1.0460

  • A350 LF2 / LF3 → EN 1.0566 / 1.0576

  • A694 F42–F70 → API 5L X42 to X70

Alloy Steel (ASTM A182 / A335 / A387)

  • F1, F5, F9, F11, F12, F22, F91 → Chromium Molybdenum Steels for high-temp service

Nickel Alloys (ASTM B564 / B160)

  • Nickel 200 / 201 → UNS N02200 / N02201

  • Monel 400 / K500 → UNS N04400 / N05500

  • Inconel 600 / 601 / 625 / 718 → UNS N06600 / N06601 / N06625 / N07718

  • Incoloy 800 / 800H / 800HT / 825 → UNS N08800 / N08810 / N08811 / N08825

  • Hastelloy C22 / C276 / B2 / B3 → UNS N06022 / N10276 / N10665 / N10675

  • Alloy 20 → UNS N08020

Copper Alloys

  • Cu-Ni 90/10 → UNS C70600 → EN CW352H

  • Cu-Ni 70/30 → UNS C71500 → EN CW354H

Titanium & Special Alloys

  • Titanium Grades 1, 2, 5, 7, 9, 12 → UNS R50250 / R50400 / R56400

  • Zirconium, Tantalum, Niobium → Available on request

Applications of Weld Neck Flanges

  • Oil & Gas Pipelines

  • Refineries & Petrochemical Plants

  • Marine & Offshore Equipment

  • Power Generation (Thermal, Nuclear, Hydro)

  • Chemical Processing

  • Water Desalination & Treatment Plants

  • Pulp & Paper Industry

Export Destinations

We export Forged Steel Weld Neck Flanges worldwide, including:
USA, Canada, Mexico, Brazil, UK, Germany, France, Italy, Spain, Norway, Russia, Saudi Arabia, UAE, Oman, Qatar, Kuwait, South Africa, Nigeria, Egypt, Turkey, India, Singapore, Japan, South Korea, Malaysia, Indonesia, Australia, Argentina, Chile, Colombia, and many more.

Why Choose DIPTI Metal Industries?

  • Established in 2009 with a legacy of trust

  • ISO & International Certifications

  • Manufacturing as per ASME, ASTM, DIN, EN, JIS, GOST, BS, ISO

  • Exporting to 70+ countries worldwide

  • Competitive pricing with on-time delivery

  • Custom-engineered solutions for critical projects

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