Flanges

Forged Flanges in Every Face and Joint Type

Slip-on, weld neck, blind, socket-weld, threaded, lap joint and spectacle flanges in stainless, duplex, carbon and alloy steel and nickel alloys.

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Stainless steel flanges
ASME B16.5Class 150–2500
ASME B16.5 & EN 1092-1Pressure classes 150 to 2500
7 TypesSlip-on · Weld neck · Blind and more
Class 150–2500ASME B16.5
MTCEN 10204 3.1 / 3.2
Heat No.Marked and traceable
Overview

The Joint That Holds the Line Together

Flanges join pipe to pipe, valve or equipment. Pressure class, facing and bore must all agree with the mating part.

We supply forged flanges to ASME B16.5 and EN 1092-1 in a full range of types and pressure classes. Each flange is ordered by material, standard, size, pressure class, facing and type, and is marked with its heat number.

Send your piping class or the mating flange details and we will confirm the right flange for the job.

  • Raised, flat & ring-type-joint faces
  • Pressure classes 150 to 2500
  • Bore to match pipe schedule
  • Forged, not cast
Product Range

Seven Flange Types, Seven Jobs

The flange type controls how it is attached to the pipe — and how well it handles pressure and fatigue.

01

Weld Neck

Long tapered hub butt-welded to the pipe. The strongest joint, for high pressure and temperature.

Best for · Severe and high-pressure service
02

Slip-on

Slips over the pipe and is fillet welded inside and out. Lower cost and easy to align.

Best for · Low-pressure and utility lines
03

Blind

Solid disc used to close the end of a pipe, valve or vessel opening.

Best for · Isolation and pressure testing
04

Socket-Weld

Pipe is inserted into a socket and fillet welded. For small-bore, high-pressure lines.

Best for · Small-bore lines
05

Threaded

Screws onto a threaded pipe without welding.

Best for · Low-pressure, non-critical lines
06

Lap Joint

Loose flange used with a stub end, so it can rotate to align bolt holes.

Best for · Frequent dismantling
07

Spectacle Blind

Figure-8 plate with one solid and one open end, for line isolation.

Best for · Positive isolation
Specifications

Common Specifications We Supply Against

Governing standards for each material family. Tell us the one on your purchase order.

Material / ProductSpecificationTypical GradesNotes
Stainless & alloy forged flangesASTM A182 / ASME SA182F304 · F304L · F316 · F316L · F321 · F310Dimensions to ASME B16.5
Duplex & super duplex flangesASTM A182F51 · F53 · F55Higher strength, chloride resistant
Carbon steel flangesASTM A105A105 · A105NAmbient and elevated temperature
Low-temperature carbon steelASTM A350LF2 · LF3Impact tested for low temperature
Alloy steel flangesASTM A182F5 · F9 · F11 · F22 · F91Cr-Mo steels for high temperature
Nickel alloy flangesASTM B564Alloy 600 · 625 · 825 · 400Corrosive and high-temperature service
Titanium flangesASTM B381Grade 2 · Grade 5Light, corrosion resistant

Dimensions: ASME B16.5, ASME B16.47 Series A and B (large diameter), EN 1092-1 (PN-rated). Availability depends on grade and size.

  • Grades we supply:
  • SS 304 / 304L
  • SS 316 / 316L
  • SS 321
  • SS 310S
  • Duplex 2205
  • Super Duplex 2507
  • Carbon Steel A105
  • A350 LF2
  • Alloy Steel F11 / F22 / F91
  • Inconel 625
  • Incoloy 825
  • Monel 400
  • Titanium Gr 2
Facing

Flange Faces at a Glance

The facing must match the mating flange and gasket.

FacingCodeTypical use
Raised faceRFMost common. A raised ring concentrates gasket load for a tight seal.
Flat faceFFUsed with cast-iron or low-pressure equipment to avoid bending the flange.
Ring-type jointRTJMetal ring gasket in a machined groove, for high pressure and temperature.
Applications

Where Flanges Are Used

The industries that most often specify this product.

  • 01Oil & Gas
  • 02Chemical & Petrochemical
  • 03Power
  • 04Marine & Shipbuilding
  • 05Water & Desalination
  • 06Pharma & Food
  • 07Fire & Building Services
  • 08Skid & Equipment
Enquiry Checklist

Six Details Make a Complete Enquiry

Send these with your request and we can quote without going back and forth.

  1. 1

    Flange type

    Weld neck, slip-on, blind, socket-weld, threaded, lap joint or spectacle.

  2. 2

    Material & grade

    For example F316L, A105 or F51.

  3. 3

    Standard & class

    ASME B16.5 Class 150/300/600… or EN 1092-1 PN rating.

  4. 4

    Size & bore

    NPS or DN, and the pipe schedule for weld-neck bore.

  5. 5

    Facing

    Raised face, flat face or ring-type joint.

  6. 6

    Documents & testing

    MTC 3.1 or 3.2, PMI or third-party inspection.

Certificates & Testing With Every Order

Mill test certificates to EN 10204 3.1 / 3.2, PMI, hydro and NDT testing, and third-party inspection can be arranged. Read how every order is checked.

Quality Policy
FAQ

Flanges: Common Questions

Still have a question?

Our team can help you choose the right grade, size and specification.

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The class is a pressure-temperature rating under ASME B16.5. A higher class (300, 600, 900, 1500, 2500) can handle higher pressure at a given temperature. The permitted pressure also falls as the temperature rises, and depends on the material group.

A weld neck flange has a long tapered hub that is butt-welded to the pipe, giving a stronger joint with better fatigue life — preferred for high pressure and temperature. A slip-on flange slips over the pipe and is fillet welded, which costs less and is easier to align.

Generally no. ASME B16.5 and EN 1092-1 flanges have different bolt-circle diameters, bolt counts and ratings, so they do not normally mate. Always match the standard of the mating flange.

Flanges are supplied with a mill test certificate. Ask for EN 10204 3.1 or 3.2, and mention PMI or third-party inspection when you enquire. See our Quality Policy.