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Stockholder & manufacturer · ISO 9001:2015 · Part of the Petrochem Group

Stainless Steel Flanges

Flanges

Carbon steel flanges

SA105N, SA350 LF2 and S235JR flanges to ASME B16.5 and BS EN 1092-1, in stock for immediate delivery or made to your specification.

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Carbon steel flanges for pressure pipework

As a leading UK supplier of carbon steel flanges, Midsteel stocks forged SA105N flanges to ASME B16.5 from Class 150 to Class 2500 and to BS EN 1092-1 from PN10 to PN40, with S235JR plate flanges for lower-pressure service. For low-temperature duty we hold European origin SA350 LF2 blind and weld neck forgings.

Our flanges are available from stock for immediate delivery or customised to suit your needs, with a broad range of material grades, sizes and specifications. Every order is backed by the certification your inspection and test plan asks for.

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Carbon Steel Flanges uk

Specification

Carbon steel flange specification

ASME B16.5 ASTM/ASME SA105N, Class 150 to 2500
Slip on, weld neck, lap joint, screwed, socket weld, blind and long weld neck
BS EN 1092-1 (forged) ASTM/ASME SA105N, PN10, PN16, PN25 and PN40, Types 01, 05, 11, 12 and 13
Plate slip on, blind, weld neck, bossed slip on and screwed
BS EN 1092-1 (plate) EN 10025 S235JR, PN10 to PN40, Types 01, 05, 12 and 13
Plate slip on, blind, bossed slip on and screwed
Low temperature European origin SA105N and SA350 LF2, Class 300 to 2500
Blind and weld neck forgings
Finish Self colour, with galvanised options
Certification ISO 9001, PED and EN 10204 3.1

Other grades, pressure ratings and wall thicknesses are available on request. Material test certificates to EN 10204 3.1 are supplied as standard.

In stock

Carbon flange types in stock

  • Weld neck flanges
  • Slip on flanges
  • Blind flanges
  • Socket weld flanges
  • Screwed (threaded) flanges
  • Lap joint flanges
  • Long weld neck flanges
  • Plate slip on flanges
  • Bossed slip on flanges
  • LF2 low-temperature forgings

SA105N, LF2 or S235JR?

SA105N is the standard forged carbon steel for flanges in ambient and high-temperature pressure service. The N means the forging has been normalised to refine its grain structure. SA350 LF2 is a carbon steel forging that has been impact tested for low-temperature service. Specify it where lines may run cold, such as gas let-down, refrigeration or outdoor plant in winter.

S235JR is a structural steel plate used for EN 1092-1 plate flanges on water, air and other low-pressure systems, where a forged flange is not required. Carbon steel will corrode if left unprotected, so flanges are supplied self colour for painting or coating after fabrication, with galvanised flanges available for exposed service.

Why choose Midsteel

Our stock is sourced from the most competitive ISO 9001 and PED accredited mills, and our product knowledge goes back to the earliest North Sea oil discoveries.

  • Tight deadlines met from stock
  • Specials machined in-house, often same day
  • Galvanised carbon steel flanges available
  • ISO 9001:2015Lloyd’s (LRQA) approved quality system
  • EN 10204 3.1 certsFull material traceability as standard
  • Same-day serviceAvailable on urgent stock and machined specials
  • In-house machiningSpecials and hard-to-find sizes made to order

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FAQs

Carbon steel flange questions

Can't find the answer? Our sales team can advise on grades, standards and lead times.

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Both are forged carbon steel to the same chemical specification. SA105N has been normalised, a heat treatment that refines the grain and gives more consistent mechanical properties, and many clients now specify it as standard.
SA350 LF2 is impact tested for low-temperature service and is specified where the design temperature falls below the limit for SA105. We stock European origin LF2 blind and weld neck forgings from Class 300 to 2500.
Yes. We stock galvanised carbon steel flanges for exposed and fire protection service. Ask our sales team for sizes and ratings.
Not on their own. Carbon steel flanges are normally painted, coated or galvanised after fabrication. If your service needs inherent corrosion resistance, consider our stainless steel flanges.

Need a price or a delivery date?

Send us your enquiry, schedule or drawing and our sales team will come back to you with stock, price and lead time.

Request a quote 01384 400290