Forged Flanges Manufacturer in India: Stainless, Duplex and Nickel Alloy in Bulk

October 9, 2026

Forged flanges are flanges made from forged or ring-rolled material rather than cut from plate or cast, giving them dense, defect-free structure and continuous grain flow around the bore. They are required by most piping codes for pressure service. Indian manufacturers supply standard ASME B16.5 and B16.47 flanges, API flanges and custom large-diameter flanges in carbon steel, low-alloy steel, stainless, duplex, super duplex and nickel alloys — for bulk distribution orders and project-specific requirements.

At a Glance: Forged Flange Materials and Specifications




Material		Common SpecificationTypical Service
Carbon steelASTM A105General piping, oil & gas
Low-temperature carbon steelASTM A350 LF2Cold climates, LNG, offshore
Alloy steelASTM A182 F11, F22High-temperature power and refinery
Stainless steelASTM A182 F304/F316LChemical, food, water
DuplexASTM A182 F51Offshore, desalination
Super duplexASTM A182 F53, F55Subsea, seawater, sour service
Nickel alloysInconel 625, 825, HastelloyCorrosive and high-temperature service

Flange Types

  • Weld neck, slip-on, blind, socket weld, threaded and lap joint
  • Large-diameter flanges to ASME B16.47
  • API 6A and API 17D flanges for wellhead and subsea service
  • Tower flanges for wind turbines
  • Custom flanges and nozzles to drawing

Forged vs Ring-Rolled Flanges

Ring Rolling manufacturer in India

For larger flanges, ring rolling produces seamless rings with circumferential grain flow, using material efficiently and reducing machining. Smaller flanges are typically closed die or open die forged.

Duplex and Super Duplex Flanges

Duplex and super duplex flanges need careful hot working, solution annealing and rapid quench to keep the right ferrite-austenite balance and avoid sigma phase. Ferrite content testing, corrosion testing (ASTM G48) and PREN verification are common requirements.

Nickel Alloy Flanges

Inconel and Hastelloy flanges are used in highly corrosive or high-temperature service. These alloys are harder to forge and need precise temperature control.

Bulk and Project Supply

Distributors and EPC contractors buying in volume need consistent quality across many heats, clear marking and full traceability. Key requirements:

  • Heat-number traceability on every flange
  • EN 10204 3.1 certificates, with 3.2 available for project orders
  • NACE MR0175 compliance for sour service where specified
  • Third-party inspection by agencies such as BV, Lloyd’s, TÜV or DNV
  • Export packing and marking

Why Buyers Choose Vinir Engineering for Forged Flanges

Supply to Indian EPCs and export markets in the US, Middle East and Europe

Ring rolling, open die and closed die forging in-house

Carbon, alloy, stainless, duplex, super duplex and nickel alloy experience

In-house solution annealing, machining, NDT and NABL-accredited testing

API and ABS approvals, plus AS9100D across all four units

Request A Flange Quote

Frequently Asked Questions

1.Why are forged flanges preferred over plate flanges?+–
Forged flanges have dense structure and grain flow around the bore, giving better strength and leak tightness. Most piping codes require forged material for pressure flanges.
2.What is the difference between F51, F53 and F55?+–
F51 is standard duplex (UNS S31803/S32205). F53 (S32750) and F55 (S32760) are super duplex grades with higher corrosion resistance.
3.Can you supply large-diameter flanges?+–
Yes. Ring rolling makes large seamless flanges economical. Share the size and specification for feasibility.
4.Do you supply flanges for sour service?+–
Yes, flanges can be supplied to NACE MR0175 / ISO 15156 requirements when specified.
5.What documentation is supplied with forged flanges?+–
EN 10204 3.1 certificates as standard, with 3.2 third-party certificates, NDT reports and PMI on request.