ASTM A182 F55 BLIND FLANGE, UNS S32760 SUPER DUPLEX STAINLESS STEEL FLANGE
ASTM A182 F55 Super Duplex steel blind flange is a solid forged flange manufactured from UNS S32760 (also known as 1.4501), designed to seal pipe ends, pressure vessels, or valve openings. This tungsten-alloyed grade delivers over 550 MPa yield strength and exceptional resistance to chloride pitting and crevice corrosion. Each flange is solution annealed and water quenched to achieve a balanced ferrite-austenite structure. Fully compliant with NACE MR0175 for sour service, it is dimensioned per ASME B16.5 and rated for high-pressure classes. These flanges are critical in subsea systems, desalination plants, and chemical processing where maximum durability and corrosion protection are required.
Chemical Composition % of ASTM A182 F55 Super Duplex Steel WNFF Flange
| Chemical Composition Limits |
| Weight% |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
N |
W |
| Super Duplex F55 |
0.03 max |
1.00 max |
0.03 max |
0.01 max |
1 max |
24-26 |
4.5-6.5 |
3-4 |
0.25 |
0.08-0.20 |
Mechanical properties of ASTM A182 F55 Super Duplex Steel WNFF Flange
| Alloy |
Tensile Strength N/mm² |
Yield Strength 0.2% N/mm² |
Elongation |
Hardness HB |
| Super Duplex F55 |
860 |
720 min |
16 min |
270 max |
Key Advantages of ASTM A182 F55 (UNS S32760 / 1.4501) Super Duplex Steel
1. Exceptional Strength-to-Weight Ratio
F55 offers minimum yield strength of 550 MPa, approximately double that of 316/316L stainless steel. This allows for thinner wall sections and lighter flange weights, reducing material costs and structural support requirements.
2. Superior Corrosion Resistance
With a PREN exceeding 40, F55 provides outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich environments. The addition of tungsten and copper significantly enhances performance in seawater, brackish water, and aggressive chemical media.
3. Sour Service Compliance
Fully NACE MR0175/ISO 15156 certified, making it suitable for oil and gas environments containing hydrogen sulfide (H₂S). This eliminates the need for corrosion inhibitors or additional coatings in sour wells.
4. Fatigue and Erosion Resistance
High hardness and strength provide superior resistance to erosion, cavitation, and fatigue cracking in high-velocity flow conditions, pumping systems, and vibrating pipeline networks
Application
- Oil & Gas
- Chemical Processing
- Desalination Plants
- Power Generation
- Marine Engineering
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