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ASTM A182 F44 / UNS S31254 Stainless Steel Weld Neck Flange 254SMO WNRF Flange

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ASTM A182 F44 / UNS S31254 Stainless Steel Weld Neck Flange 254SMO WNRF Flange

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Brand Name :	YUHONG
Model Number :	ASTM A182 F44 Stainless Steel WNRF Flange
Certification :	ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008
Payment Terms :	L/C,T/T
Delivery Time :	7 DAYS

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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

Exceptional Corrosion Resistance:

Outstanding resistance to pitting and crevice corrosion in seawater, brackish water, chlorinated water, and other high-chloride environments.

Excellent resistance to general corrosion in a wide range of acids (sulfuric, phosphoric, acetic, formic) and alkaline solutions.

Good resistance to stress corrosion cracking (SCC) compared to standard austenitics, though not immune.

Application

Offshore Oil & Gas / Marine Engineering
- Seawater Cooling Systems: Pumps, heat exchangers, pipe manifolds.
- Ballast Water Treatment: High-salinity, biofilm-prone environments.
- Subsea Equipment: Christmas trees, manifolds exposed to chlorides.
- Desalination Plants: RO membranes, brine heaters, evaporators (resists pitting from chlorides at high temps).
Chemical & Petrochemical Processing
- Acid Handling: Sulfuric, phosphoric, formic, and acetic acid pipelines/reactors.
- Chlorinated Solvents: Equipment in PVC/VCM production.
- Oxidizing Media: Bleach (hypochlorite), hydrogen peroxide transfer lines.
Flue Gas Desulfurization (FGD) Systems
- Scrubber Inlet/Outlet Ducts: Combats chlorides, SO₂, and fly ash abrasion.
- Absorber Tower Nozzles: Critical connections in aggressive wet-scrubbing environments.
Pulp & Paper Industry
- Bleach Plants: Chlorine dioxide (ClO₂) stages and storage.
- Digester Vents: Resists H₂S and acidic condensates.
Pharmaceutical & Food Processing
- Ultra-Pure Water (UPW) Systems: High-purity steam/water distribution.
- CIP (Clean-in-Place) Lines: Withstands chlorinated sanitizers (e.g., sodium hypochlorite).
Pollution Control & Wastewater
- Chloride-Rich Effluents: Chemical waste, landfill leachate processing.
- Seawater Sewage Outfalls: Marine discharge pipelines.

ASTM A182 F44 / UNS S31254 Stainless Steel Weld Neck Flange 254SMO WNRF Flange

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