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19 grades Flanges

Stainless Steel Flanges

Flanges join pipes, valves, pumps and equipment with a bolted, gasketed joint that can be taken apart. Dimensions and pressure-temperature ratings follow ASME B16.5 (NPS ½"–24") and B16.47 Series A/B (NPS 26"–60"), in classes 150 to 2500.

Choose a grade below for specifications, composition, sizes and weight charts.

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Stainless Steel flanges NPS ½" – 24" (B16.5), 26"

Stainless Steel flanges by grade

Typical PREN (Cr + 3.3Mo + 16N)TYPICAL PREN (CR + 3.3MO + 16N)012.52537.550SS 254 SMO42–45Super Duplex 250741–43SS 904L32–36Duplex 220534–35SS 31728–30SS 317L28–30SS 31623–25SS 316L23–25SS 316Ti23–25SS 30418–20SS 304L18–20
Stainless Steel grades available as flanges, ranked on the property that separates them most.
Stainless Steel flanges: grade selector
GradeSpecificationKey characteristicTypical use
SS 304 FlangesASTM A182 F304Balanced corrosion resistance, formability and costFood, dairy and beverage processing equipment
SS 304L FlangesASTM A182 F304LCarbon limited to 0.030% for weld-zone corrosion resistanceWelded process piping and headers
SS 304H FlangesASTM A182 F304HCarbon 0.04–0.10% for elevated-temperature strengthSuperheater and reheater tubes
SS 309S FlangesASTM A182 F309H / to orderLow carbon for better weldabilityFurnace linings, doors and dampers
SS 310S FlangesASTM A182 F310Low carbon for weldabilityFurnace components, hearths and dampers
SS 316 FlangesASTM A182 F3162–3% molybdenum for chloride pitting resistanceChemical and petrochemical process equipment
SS 316L FlangesASTM A182 F316LCarbon 0.030% max for weld-zone corrosion resistanceChemical and fertiliser process piping
SS 316Ti FlangesASTM A182 F316TiTitanium-stabilised against sensitisationHeat exchangers and pressure vessels to EN / AD 2000
SS 317 FlangesASTM A182 F3173–4% molybdenum for higher pitting resistanceFlue-gas desulphurisation (FGD) systems
SS 317L FlangesASTM A182 F317LLow carbon for welded constructionFGD scrubbers and absorber towers
SS 321 FlangesASTM A182 F321Titanium-stabilised: Ti ≥ 5×(C+N)Exhaust systems and manifolds
SS 321H FlangesASTM A182 F321HCarbon 0.04–0.10% with Ti stabilisationRefinery hydrocracker and reformer piping
SS 347 FlangesASTM A182 F347Niobium-stabilised: Nb ≥ 10×CRefinery piping and heater tubes
SS 347H FlangesASTM A182 F347HHigh creep-rupture strengthSuperheater and reheater tubes (A213 TP347H / TP347HFG)
SS 410 FlangesASTM A182 F6aHardenable by quench and temperPump and valve shafts
SS 904L FlangesASTM A182 F904LHigh Ni-Mo-Cu for sulphuric and phosphoric acidsSulphuric acid plants and coolers
Duplex 2205 FlangesASTM A182 F51Yield strength about 450 MPa: roughly twice that of SS 316LOil and gas flowlines, manifolds and process piping
Super Duplex 2507 FlangesASTM A182 F53PREN ≥ 40: suitable for seawaterSeawater cooling and firewater piping
SS 254 SMO FlangesASTM A182 F446% molybdenum super-austeniticSeawater cooling and heat exchangers

How stainless steel flanges are made, sized and tested

Stainless Steel Flanges NPS ½" – 24" (B16.5), 26"

How it's madeFlanges are forged from billets (or cut from plate for some blind and plate flanges), heat treated to the material specification, and machined: bore, face, raised face or ring groove, bolt holes and hub bevel.

Size range
NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request
Finish
Raised face (RF), flat face (FF) or ring-type joint (RTJ); serrated spiral or concentric face finish (typically 3.2 – 6.3 µm Ra)
Ends
Weld-neck bevel matched to pipe schedule; socket bore; threaded

Testing & documents

  1. Chemical and mechanical tests of the forging
  2. Dimensional inspection to ASME B16.5 / B16.47
  3. Hardness, impact and IGC tests as specified
  4. Ultrasonic testing of forgings on request
  5. EN 10204 3.1 certificate; 3.2 with third-party inspection
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Frequently asked questions

What does flange class 150 or 300 mean?

It's the pressure-temperature rating class under ASME B16.5. The allowable working pressure depends on the material group and temperature, not simply "150 psi".

RF or RTJ?

Raised-face flanges with spiral-wound or sheet gaskets are standard. Ring-type joint (RTJ) flanges with metal ring gaskets are used for high pressure and temperature.

Which stainless steel grades are available as flanges?

SS 304, SS 304L, SS 304H, SS 309S, SS 310S, SS 316, SS 316L, SS 316Ti, SS 317, SS 317L, SS 321, SS 321H, SS 347, SS 347H, SS 410, SS 904L, Duplex 2205, Super Duplex 2507, SS 254 SMO.

Which specifications cover stainless steel flanges?

ASTM A182, depending on grade.

Need stainless steel flanges?

Send grade, size, quantity and destination.

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