Stainless Steel Flanges Supplier & Stockist in India

SS 304, 304L, 316 and 316L flanges for food, pharma, chemical, water treatment and coastal plants. Forged to ASTM A182 and ASME B16.5, or cut from SS plate for low-pressure lines.

ASTM A182 F304 / F316LASME B16.5 Class 150–600Weld neck, slip-on, blindLap joint with stub ends½" to 24"MTC on request
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Stainless steel weld neck flange drawing with butt weld to SS pipe
A stainless weld neck flange is butt-welded to the pipe and bored to match the pipe schedule.

Stainless steel flanges that match your pipe and your service

Stainless steel flanges are used where carbon steel would rust or contaminate the product: drinking and RO water, food and dairy, pharma utilities, chemicals, and plants near the sea. Pressure-rated SS flanges are forged to ASTM A182 and marked with the grade, such as F304L or F316L. For low-pressure lines, flat SS flanges can also be cut from ASTM A240 plate.

We supply SS flanges together with SS seamless pipes, SS round pipes and fittings, so grade, schedule and bore can be matched in one order.

Stainless steel flanges that match your pipe and your service: specification summary
Forged gradesASTM A182 F304, F304L, F316, F316L; F321 and F310 on request; duplex grades on request
Plate gradesASTM A240 304 / 316 for flat, low-pressure flanges
TypesWeld neck, slip-on, blind, socket weld, threaded, lap joint with SS stub ends, plate
StandardsASME B16.5 Class 150, 300, 600 (higher on request); EN 1092-1 PN; BS 10 Table D / E
Sizes½" to 24" to ASME B16.5; larger to order
FacingRaised face (RF), flat face (FF); RTJ on request
Marking and documentsGrade, size, class and heat number; mill test certificate on request

304 or 316: choosing the grade

GradeWhat it addsTypical service
304 (F304)18% chromium, 8% nickel: good general corrosion resistanceWater, air, food contact, general process
304L (F304L)Low carbon, so welded joints resist corrosion at the weldWelded process lines, dairy, beverage
316 (F316)About 2% molybdenum for better resistance to chloridesChemicals, coastal plants, brine, cooling water
316L (F316L)Low-carbon 316 for welded chloride servicePharma, RO and desalination, chemical dosing
321 (F321)Titanium-stabilised for service at elevated temperatureHot gas, exhaust and heat-recovery lines

Weld an L-grade flange to an L-grade pipe. Many forged flanges are dual-certified (for example 316/316L), which covers both. Read our SS 304 vs SS 316 guide for more on grade choice.

Match the flange to the pipe

  • Weld neck: the bore must match the pipe's inside diameter, so state the schedule (Sch 10S, 40S or 80S).
  • Slip-on and socket weld: the bore or socket is sized to the pipe's outside diameter. Give the pipe OD, not only the NB size.
  • Grade: keep flange and pipe in the same grade family so the weld behaves the same way as the parent metal.

Pressure ratings in ASME B16.5 depend on the material group, and L grades are rated lower than standard grades in the same class. Check the rating for your grade and design temperature, or see our pressure class guide.

Cutting cost on stainless lines with lap joints

On large SS lines, a lap joint flange with an SS stub end lets the fluid touch only the stub end. The loose backing flange can then be carbon steel, which costs much less than a full SS flange and rotates to line up bolt holes. It also makes lines easier to dismantle for cleaning.

Handling and fabrication

Store and fabricate stainless flanges away from carbon steel. Carbon steel grinding dust and tools leave iron on the surface, which later rusts and stains. After welding, pickling and passivation restore the protective surface. Use gaskets and bolting suited to the fluid and temperature.

Where SS flanges are used

  • Pharma and biotech utilities: purified water, clean steam and CIP lines
  • Food, dairy, beverage and distillery plants
  • Chemical and fertilizer process lines
  • Water treatment, RO and desalination
  • Coastal and offshore-adjacent plants where MS corrodes quickly
  • Paper, sugar and textile process water

Pipes and fittings to go with SS flanges

Pipe or fittingUse it with these flanges when…
SS seamless pipes (304 / 316L)you need schedule pipe for pressure or process lines
SS round pipesthe line uses welded SS pipe or tube
SS stub ends with lap joint flangesyou want a cheaper backing flange or easy dismantling
SS elbows, tees and reducersyou need fittings in the same grade
Need SS flanges with matching pipe?Send grade, type, class, size and schedule for a quotation.
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Flange types we supply

Each page covers materials, standards, sizes and where that flange fits. All flanges can be quoted with matching pipes and fittings.

MS Flanges drawingMS FlangesIS 2062 mild steel, Table E / IS 6392 / ASA 150 Stainless Steel Flanges drawingStainless Steel FlangesSS 304, 304L, 316, 316L to ASME B16.5 Carbon Steel Flanges drawingCarbon Steel FlangesForged ASTM A105, A350 LF2, Class 150 to 1500 Slip-On Flanges (SORF) drawingSlip-On Flanges (SORF)Pipe slides in, two fillet welds Weld Neck Flanges (WNRF) drawingWeld Neck Flanges (WNRF)Butt-welded, bored to pipe schedule Blind Flanges drawingBlind FlangesClose pipe ends, nozzles and test points Socket Weld Flanges drawingSocket Weld FlangesSmall-bore, high-pressure lines Threaded Flanges drawingThreaded FlangesNPT / BSP, no welding, GI lines Lap Joint Flanges drawingLap Joint FlangesLoose flange with stub end Plate Flanges drawingPlate FlangesFlat flanges, Table D/E/F/H, custom Flange Size & Class Chart drawingFlange Size & Class ChartASME B16.5 OD, PCD, bolts and ratings
FAQ

Frequently Asked Questions

We supply forged flanges in ASTM A182 F304, F304L, F316 and F316L, plus flat flanges from ASTM A240 304 and 316 plate. F321, F310 and duplex grades are available on request.

SS 316 contains about 2% molybdenum, which gives better resistance to chlorides such as salt water, brine and many chemicals. SS 304 is suitable for most water, air and food service and costs less.

It is the ASTM A182 grade marking for forged 316L stainless steel. The “F” stands for forged, and “L” means low carbon, which helps welded joints resist corrosion.

Mill test certificates are available on request. Ask at enquiry stage, including the certificate type you need, so it is included in the quotation.

It can be done with a dissimilar-metal welding procedure, commonly using a 309-type filler, but the MS pipe will still corrode. It is normally done only where stainless is needed at the joint. Tell us the service and we will suggest the right combination.

For low-pressure water and air lines, flat SS flanges cut from plate work well and cost less. For pressure piping to ASME B16.5, use forged ASTM A182 flanges.

Buyer Guides & Tools

Flange Size Chart & Pressure ClassesASME B16.5 OD, PCD, bolts, Class 150 to 2500ERW vs Seamless PipeWhich pipe to use with your flangesPipe & Tube Weight CalculatorMS / SS / GI round, square & rectangularSteel Pipe Buying Guide for IndiaChecklist before you request a quoteSS 304 vs SS 316Choosing the stainless grade
Free Quotation

Get a Flange Quote

Tell us the flange type, size, class or table, material and quantity. We reply on call, WhatsApp or email.

  • MS, carbon steel and stainless steel flanges on one quotation
  • Matching pipes, elbows, tees and reducers from the same order
  • Dispatch from Thane / Panvel to sites across India
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