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ASTM A182 F53 Flanges (UNS S32750) – Super Duplex 2507 Supplier in Mumbai
Nicorex Alloys is an importer, stockist, supplier, and trader of F53 super duplex flanges based in Mumbai, India. We supply UNS S32750 flanges, also identified as Super Duplex 2507 flanges, SAF 2507 flanges, and Werkstoff 1.4410 flanges, in compliance with the ASTM A182 / ASME SA182 standard.
ASTM A182 F53 flanges have a carry a nominal composition of 25% Cr, 7% Ni, 4% Mo, and 0.28% N (the highest nitrogen content). They have a PREN of 41 or higher. This is the threshold where super duplex classification begins. Minimum yield strength is 550 MPa (80 ksi). Tensile strength is 800 MPa with a minimum elongation of 15% and a hardness ceiling of 310 HB. These forged flanges feature a 50/50 austenite-ferrite microstructure that pairs extreme chloride pitting resistance with mechanical strength for pressure-critical piping. The CPT exceeds 50°C per ASTM G48, making F53 the default forging grade for offshore platform piping, subsea manifold connections, and desalination systems handling hot brine.
We supply these ASTM A182 SDSS F53 flanges in types that include WNRF, SORF, BLRF, SWRF, Threaded, Lap Joint, Long Weld Neck, RTJ, Spectacle Blind, and Reducing configurations. Sizes range from NPS 1/2″ to 24″ per ASME B16.5 and NPS 26″ to 60″ per ASME B16.47, in pressure classes 150 through 2500. Key industries include offshore oil & gas, subsea & seawater systems, desalination plants, chemical processing, mining, and other industries, as explained below.
Super Duplex S32750 Flanges Specifications
| Specifications | ASTM A182 / ASME SA182 Grade F53 |
|---|---|
| Standards | ASME B16.5, ASME B16.47, MSS SP-44, EN 1092-1 |
| Flange Types | WNRF, SORF, BLRF, SWRF, Threaded, Lap Joint, LWNRF, RTJ, Spectacle Blind, Reducing |
| Size (ASME B16.5) | NPS 1/2” to NPS 24” |
| Size (ASME B16.47) | NPS 26” to NPS 60” |
| Pressure Classes | 150, 300, 400, 600, 900, 1500, 2500 |
| Face Types | RF, FF, RTJ, Tongue & Groove |
Chemical Composition of ASTM A182 F53 (UNS S32750)
| Element | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Manganese (Mn) | Silicon (Si) | Carbon (C) | Copper (Cu) | Iron (Fe) |
|---|---|---|---|---|---|---|---|---|
| Min (%) | 24.0 | 6.0 | 3.0 | – | – | – | – | Balance |
| Max (%) | 26.0 | 8.0 | 5.0 | 1.20 | 0.80 | 0.030 | 0.50 | – |
PREN = %Cr + 3.3(%Mo) + 16(%N). Typical mid-range: 25 + 13.2 + 4.48 = 42.7. NORSOK M-630 tightens S to ≤0.010% and P to ≤0.025% beyond ASTM A182 limits.
Mechanical Properties of ASTM A182 F53 Flanges
| Property | Tensile Strength | Yield 0.2% (min) | Elongation (min) | Hardness (max) | Charpy Impact |
|---|---|---|---|---|---|
| Value | 800 MPa | 550 MPa (80 ksi) | 15% | 310 HB (32 HRC) | ≥45 J at -46°C |
Super Duplex Steel UNS S32750 Equivalent Grades
| UNS | EN / Werkstoff | DIN | AFNOR | JIS |
|---|---|---|---|---|
| S32750 | 1.4410 | X2CrNiMoN25-7-4 | Z3 CN 25.06 Az | SUS 327J1 |
Get ASTM A182 F53 Flanges at Competitive Prices
Types of ASTM A182 Grade F53 Super Duplex Stainless Steel Flanges
F53 flanges are hot forged at 1050–1150°C and solution annealed at ≥1050°C with rapid water quench. The higher annealing temperature vs F60 (1020°C) reflects F53’s increased Cr and Mo, requiring complete dissolution of intermetallic precipitates. At Nicorex Alloys, we stock the following 2 types of ASTM A182 F53 SDSS flanges:
Super Duplex UNS S32750 Weld Neck Flange
SDSS ASTM A182 F53 Blind Flanges
Super Duplex Stainless Steel S32750 Slip-On Flanges
Super Duplex Steel UNS S32750 Socket Weld Flanges
Super Duplex F53 Threaded Flange
Super Duplex Steel S32750 Orifice Flange
ASTM A182 F53 Lap Joint Flange
UNS S32750 Spectacle Blind Flange
F53 Super Duplex Steel Ring Type Joint Flange (RTJ)
SDSS UNS S32750 Reducing Flange
Super Duplex S32750 Long Weld Neck Flange
Pressure-Temperature Ratings for Super Duplex UNS S32750 Flanges
S32760 flanges are covered under Group 2.8 of ASME B16.5 and are available in pressure classes 150 to 2500. They can be used up to 600°F (316°C), beyond which sigma phase forms and weakens the material.
| Temp (°F / °C) | Class 150 (psi / bar) | Class 300 (psi / bar) | Class 400 (psi / bar) | Class 600 (psi / bar) | Class 900 (psi / bar) | Class 1500 (psi / bar) | Class 2500 (psi / bar) |
|---|---|---|---|---|---|---|---|
| −20 / −29 | 290 / 20.0 | 750 / 51.7 | 1000 / 68.9 | 1500 / 103.4 | 2250 / 155.1 | 3750 / 258.6 | 6250 / 430.9 |
| 100 / 38 | 290 / 20.0 | 750 / 51.7 | 1000 / 68.9 | 1500 / 103.4 | 2250 / 155.1 | 3750 / 258.6 | 6250 / 430.9 |
| 200 / 93 | 260 / 17.9 | 750 / 51.7 | 1000 / 68.9 | 1500 / 103.4 | 2250 / 155.1 | 3750 / 258.6 | 6250 / 430.9 |
| 300 / 149 | 230 / 15.9 | 720 / 49.7 | 960 / 66.3 | 1440 / 99.4 | 2160 / 149.1 | 3600 / 248.5 | 6000 / 414.2 |
| 400 / 204 | 200 / 13.8 | 665 / 45.7 | 885 / 60.9 | 1330 / 91.4 | 1990 / 137.1 | 3325 / 228.5 | 5540 / 380.8 |
| 500 / 260 | 170 / 11.7 | 605 / 41.7 | 805 / 55.6 | 1210 / 83.4 | 1815 / 125.0 | 3025 / 208.4 | 5040 / 347.4 |
| 600 / 316 | 140 / 9.6 | 555 / 38.3 | 740 / 51.0 | 1110 / 76.6 | 1665 / 114.9 | 2775 / 191.5 | 4625 / 319.1 |
Industrial Applications of Super Duplex 2507 Flanges
- North Sea platform piping, subsea manifolds, FPSO topside systems, Christmas tree connections, and choke valve flanges.
- High-pressure pump flanges, RO membrane housing connections, and brine reject piping all use F53 in desalination plants. Major projects across the Middle East and Mediterranean routinely specify S32750.
- Reactor vessel nozzle flanges in chloride-bearing organic acid processes, dilute HCl recovery systems (below 2%), and dilute sulphuric acid handling (below 10%).
- ClO₂ bleaching stage piping flanges in kraft pulp mills, penstock connections in hydropower plants, and structural components on marine-atmosphere bridges all use F53.
- Acid leach circuit piping flanges, slurry pipeline connections, and autoclave fittings in pressure oxidation (POX) gold processing are common F53 applications.
How to Order Super Duplex S32750 Flanges from Nicorex Alloys
Provide the following details to place an order for SDSS S32750 flanges:
- Flange Type — WNRF / BLRF / SORF / SWRF / RTJ
- Size — NPS and Schedule (½" to 24"+)
- Pressure Class — 150 / 300 / 600 / 900 / 1500 / 2500
- Face Type — RF / FF / RTJ / T&G
- Material Grade — Super Duplex S32750 / UNS S32750 / W.Nr. 1.4410 / F53
- Quantity — Number of pieces or kg
- Standard — ASME B16.5 / B16.47 / ASTM A182 Grade F53
- Additional Requirements — PREN ≥ 42, NACE, PMI, ferrite content (40–55% FN)
- Documentation — MTC 3.1/3.2, PMI, FN Report, TPI Certificate
- Delivery — Domestic / International (specify destination)
Frequently Asked Questions
What is the PREN of ASTM A182 F53 and Why Does It Matter?
What is the Difference Between F53 (S32750) and F55 (S32760) Flanges?
Can ASTM A182 F53 Flanges Withstand Seawater at Elevated Temperatures?
What Welding Consumables are used for F53 Super Duplex Flanges?
Standard consumables are ER2594 (AWS A5.9) for GTAW/TIG and E2594 (AWS A5.4) for SMAW. These are over-alloyed with ~9.5% Ni for adequate austenite formation. Shielding gas is Ar + 2% N₂ for root passes. Interpass temperature must stay below 150°C to prevent sigma phase.
Is ASTM A182 F53 Approved for NORSOK Projects?
Yes. UNS S32750 is approved under NORSOK M-630 MDS D54 (bars) and MDS D57 (forgings). Qualification requires ASTM A923 Methods A, B, and C, ASTM G48 pitting tests, and Charpy impact testing at −46°C, from a mill certified per NORSOK M-650 or ISO 17782.
What is the Maximum Hardness for F53 Flanges in NACE Sour Service?
The maximum hardness is 32 HRC (approximately 310 HBW) as per NACE MR0175 / ISO 15156. Some operator specs (Shell DEP, Saudi Aramco SAES) reduce this to 28 HRC. The material must be solution-annealed and water-quenched with documented ferrite content of 40–60%.
How Does F53 Compare to Nickel Alloy Flanges for Offshore Service?
F53 flanges provide approximately 80% of Inconel 625 or Hastelloy C276 corrosion resistance properties at 40–50% of the cost. F53 is preferred when chloride pitting and SCC drive material selection. Nickel alloys are necessary for concentrated acid resistance, temperatures above 316°C, or high-pressure sour gas conditions beyond duplex capability.