Pitting and Crevice Corrosion Resistant S32760 Threaded Flanges

Localized pitting and crevice corrosion represent common integrity threats to threaded pipe joints operating in chloride-rich environments. Dafugui's Pitting and Crevice Corrosion Resistant S32760 Threaded Flanges utilize a highly alloyed chemistry—containing Chromium, Molybdenum, Nitrogen, and Tungsten—to maintain passive film stability. These forged connectors deliver reliable mechanical sealing across varied pressure and temperature conditions.

Metallurgical Resistance to Localized Attack

• Engineered PREN > 42 Compliance: Pitting Resistance Equivalent Number calculated via PREN = %Cr + 3.3(%Mo + 0.5%W) + 16%N. The addition of Nitrogen and Tungsten provides higher resistance to pitting initiation than standard duplex alloys.

• Crevice Corrosion Mitigation: Thread roots and gasket contact faces can trap stagnant fluid. The passive oxide film of S32760 helps prevent crevice activation under stagnant deposits.

• Dense Forged Grain Structure: Forged production eliminates internal gas porosity and inclusions, Pitting and Crevice Corrosion Resistant S32760 Threaded Flanges provides a dense metal structure resistant to localized fluid penetration.

Standards & Technical Specifications

Zhejiang Dafugui S32760 Flanges Details

Zhejiang Dafugui S32760 Flanges PROCESS flow

Corrosion Quality Verification

• Critical Pitting Temperature (CPT) Testing: Tested in accordance with ASTM G48 Method C upon customer specification to verify pitting resistance thresholds.

• Alloy Balance Inspection: 100% PMI spectrographic audit to ensure proper balance of Cr, Mo, Ni, N, W, and Cu.

• Thread Tolerance Check: Gauged against ANSI B1.20.1 standards to maintain thread engagement accuracy.

Factory Quality Infrastructure

• Integrated Quality Systems: Certified to ISO 9001, ISO 14001, and OHSAS 18001 standards, backed by a technical workforce of 200 employees.

• Precision Machining Facilities: High-precision CNC lathes ensure accurate thread profiles and smooth sealing faces.

Commercial & Procurement Information

• MOQ: 1 Piece

• Lead Time: 15–30 Days for standard dimensions; 35–45 Days for custom forgings

• Warranty: 12 Months limited quality warranty from shipment date

• Export Packaging: Sealed with VCI anti-corrosion barrier film and packed in ISPM 15 compliant wooden cases

Frequently Asked Questions

• How does a Pitting and Crevice Corrosion Resistant S32760 Threaded Flanges greater than 42 affect joint service performance?
A higher PREN value indicates greater resistance to passive film breakdown in chloride environments, helping reduce localized pitting in stagnant or high-salinity media.

• Are thread sealants recommended during assembly?
Yes. Applying a high-grade PTFE tape or compatible thread compound is recommended to facilitate assembly, prevent thread galling, and ensure leak-tight seating.

• Can Dafugui supply MTC 3.2 certified flanges with third-party endorsement?
Yes. We can provide EN 10204 3.2 certification co-signed by independent inspection agencies such as SGS or TÜV.