Super Duplex 2507 Flange ASTM A182 F53 UNS S32750 Super Duplex Weld Neck Flange

ASTM A182 F53 / UNS 32750 / Super Duplex 2507 Weld Neck Flange WNRF Flange

Specialized Corrosion Resistance of ASTM A182 F53 Super Duplex Steel Flange Weld Neck Flange

• Erosion-Corrosion: Performs well in high-velocity seawater (e.g., subsea pipelines) due to combined resistance to mechanical wear and chloride attack.

• Stress Corrosion Cracking (SCC): Resists SCC in chloride-rich, high-temperature environments (e.g., geothermal brines), unlike austenitic steels like 316L.

• Hydrogen Embrittlement: Less prone than martensitic steels but requires caution in sour (H₂S) environments. Compliant with NACE TM0177 (tensile testing in H₂S).

Chemical Composition of ASTM A182 F53 Super Duplex Steel Flange Weld Neck Flange 

Mechanical properties of ASTM A182 F53 Super Duplex Steel Flange Weld Neck Flange

Comparative Advantages Over Alternatives

• vs. Duplex 2205 (F51/S32205): Higher Cr, Mo, and N content in 2507 provides superior pitting resistance (PREN 42 vs. 35) and strength (550 MPa vs. 450 MPa yield).

• vs. Titanium: Lower cost (~50% less) and better thermal conductivity, though less resistant to reducing acids like HCl.

• vs. Nickel Alloys (e.g., Hastelloy): More cost-effective for chloride environments but unsuitable for highly oxidizing conditions (e.g., hot nitric acid).

Application

• Oil and gas exploration: Subsea pipelines, Christmas trees, manifolds.
• Chemical processing plants:HCl, H₂S, and chloride-rich environments.
• Marine applications: onshore & offshore engineering.
• Power generation:Flue gas desulfurization (FGD) systems.
• Desalination Plants: Seawater reverse osmosis systems.

NO CRACK (PT TEST)