ASTM A182 F44 / UNS S31254 Stainless Steel Weld Neck Flange 254SMO WNRF Flange
ASME B16.5 A182 F44 / Alloy 254 SMO / 1.4547 / UNS S31254 Stainless Steel WN RF Flange
ASTM A182 F44 Alloy 254 SMO / UNS S31254 Super Austenitic Stainless Steel is described as a 6% Mo Flanges super austenitic stainless
steel, which is designed for the maximum resistant to crevice corrosion and pitting. It is engineered for extreme corrosion resistance, especially in chloride-rich environments where standard stainless steels (304/316L) or duplex steels fail. It comes with high levels of molybdenum, chromium, nitrogen and is great for high chloride environments like bleach plants and chloride processing streams. There are different standards for sizing such as ASME, ANSI, DIN and other international standards.
The Equivalent Grade
| UNS Number | UNS S31254 |
|---|---|
| Werkstoff | 1.4529 |
| ASTM Specifications | A479, A473, A240, F44 |
| Other Common Names | SMO 254, 254SMO, Alloy 254, EN 1.4547 |
ASTM A182 F44 / Alloy 254 SMO Stainless Steel Flange Chemical Composition
| ELEMENT % | ||||||||||
| GRADE | C max |
Mn max |
Cr | Ni | Mo | N | Cu | P max |
S max |
Si max |
| 254 SMO | 0.02 | 1.00 | 19.50-20.50 | 17.50-18.50 | 6.00-6.50 | 0.18-0.22 | 0.50-1.00 | 0.03 | 0.01 | 0.8 |
A182 F44 / Alloy 254 SMO Stainless Steel Flange Mechanical Properties (Annealed)
| Hardness (HB) | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) (Long.) | Impact Value (J) (Long.) |
|---|---|---|---|---|
| 260 max | 650-850 | 300-340 | 35 min | 100 min |
| Carbon Steel DIN 2576 Flange | ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80) |
| Stainless Steel DIN 2576 Flange | ASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8, CF3, CF8M, CF3M, DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409 |
| Alloy Steel DIN 2576 Flange | ASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F44, F91 |
| Titanium DIN 2576 Flange | ASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7 ASTM R50250/GR.1 | R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 | R52400/GR.7 | R53400/GR.12 | R56320/GR.9 |R56400/GR.5 |
| Copper DIN 2576 Flange | T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc |
| Copper Nickel DIN 2576 Flange | ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640 |
| Brass DIN 2576 Flange | 3602 / 2604 / H59 / H62 / etc. |
| Inconel DIN 2576 Flange | ASTM B564 / ASME SB564, Inconel 600, 601, 625, 718, 783, 690, x750 DIN 2576 Flange |
| Hastelloy DIN 2576 Flange | ASTM B564 / ASME SB564, Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X Flanges |
| Monel DIN 2576 Flange | ASTM B564 / ASME SB564, Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500) |
| Alloy 20 DIN 2576 Flange | ASTM B462 / ASME SB462, Carpenter® 20 Alloy, Alloy 20Cb-3 |
| Aluminium DIN 2576 Flange | 5052 /6061/ 6063 / 2017 / 7075 / etc. |
| Nickel DIN 2576 Flange | ASTM B564 / ASME SB564, Nickel 200, Nickel 201, Nickel 205, Nickel 205LC |
| Duplex DIN 2576 Flange | S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 |
| Super Duplex DIN 2576 Flange | S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 |
| Incoloy DIN 2576 Flange | ASTM B564 / ASME SB564, Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925 Flanges |
Application
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Offshore Oil & Gas / Marine Engineering
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Seawater Cooling Systems: Pumps, heat exchangers, pipe manifolds.
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Ballast Water Treatment: High-salinity, biofilm-prone environments.
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Subsea Equipment: Christmas trees, manifolds exposed to chlorides.
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Desalination Plants: RO membranes, brine heaters, evaporators (resists pitting from chlorides at high temps).
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Chemical & Petrochemical Processing
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Acid Handling: Sulfuric, phosphoric, formic, and acetic acid pipelines/reactors.
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Chlorinated Solvents: Equipment in PVC/VCM production.
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Oxidizing Media: Bleach (hypochlorite), hydrogen peroxide transfer lines.
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Flue Gas Desulfurization (FGD) Systems
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Scrubber Inlet/Outlet Ducts: Combats chlorides, SO₂, and fly ash abrasion.
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Absorber Tower Nozzles: Critical connections in aggressive wet-scrubbing environments.
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Pulp & Paper Industry
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Bleach Plants: Chlorine dioxide (ClO₂) stages and storage.
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Digester Vents: Resists H₂S and acidic condensates.
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Pharmaceutical & Food Processing
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Ultra-Pure Water (UPW) Systems: High-purity steam/water distribution.
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CIP (Clean-in-Place) Lines: Withstands chlorinated sanitizers (e.g., sodium hypochlorite).
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Pollution Control & Wastewater
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Chloride-Rich Effluents: Chemical waste, landfill leachate processing.
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Seawater Sewage Outfalls: Marine discharge pipelines.
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