EN Standard DN25-DN200 Marine Offshore Salt Fog Medium-High Pressure Anti-Corrosion SO Flange

EN1092-1 F316L PN25 RF Slip-on Flange is medium-high pressure heavy anti-corrosion forged fitting specially designed for shipbuilding & offshore platform harsh salt fog high-humidity working conditions. Combine advantages of low carbon 304L & molybdenum F316: carbon ≤0.03% eliminates weld intergranular cracking under coastal salt corrosion, molybdenum alloy resists seawater chloride erosion, pass 5000-hour neutral salt spray test standard for marine equipment浦项(张家.... PN25 (2.5MPa) medium-high pressure rating meets marine ballast water, fire piping & offshore process heavy load demand.

Ultra-thick integral forged hub double-side welding construction improves overall rigidity, resist ship pipeline vibration & wave impact load. Super enhanced marine anti-rust passivation treatment avoids surface rust & seizure in long-term high-salt humid environment. Strict European standard dimension control, compatible with global ship piping standard. Size DN25~DN200, dedicated marine flange production line ensures stable batch quality, complete ship inspection certification documents supplied with each order.

Core Selling Points

1. Dual advantage: low carbon anti-weld crack + molybdenum anti-seawater chloride corrosion

2. Pass 5000h marine neutral salt spray test, professional marine grade anti-corrosion performance

3. PN25 medium-high pressure bearing, adapt to marine heavy-load ballast & fire protection pipeline

4. Extra thick forged hub structure, outstanding anti-vibration & anti-loosening for ship piping

5. Ultra-enhanced passivation layer, no rust or sticking under long-term coastal high humidity

6. Double internal-external weld uniform stress, low deformation under vessel sway vibration

7. Compact slip-on hub design, fit narrow cabin limited installation space

Applicable Industries

Shipbuilding industry, offshore oil & gas platform engineering, coastal port water supply & drainage, marine fire protection piping, seawater desalination equipment, coastal chemical plant high-humidity process pipelines, yacht marine fluid system

Why Choose Us

We have independent marine-grade flange production & inspection standards, equipped with dedicated salt spray testing machine for full batch inspection. All marine F316L slip-on flanges strictly control carbon & molybdenum content to meet marine engineering specification. Complete ship inspection certificate & EU PED certification provided, exclusive 18-month heavy marine working condition warranty. Long-term stable supply to global shipyards & offshore EPC projects, provide one-stop marine pipeline fitting solution.

Customization Capabilities (8 Items)

1. Marine dedicated salt fog anti-corrosion enhanced surface customization

2. Anti-vibration thickened hub & anti-loosening structural reinforcement machining

3. Full set ship inspection certification & supporting document customization

4. High humidity environment anti-oxidation anti-rust coating surface treatment

5. Space-saving lightweight optimized dimension for narrow ship cabin

6. Marine anti-corrosion identification laser engraving & marking customization

7. Waterproof moisture-proof seaworthy special export packaging for ocean shipment

8. Custom third-party marine grade salt spray performance inspection report

FAQ

1:Who Are We?

We are a comprehensive industrial and trading supplier integrating R&D, production, sales and import & export services, specializing in stainless steel valves and flanges.

2:How Do We Guarantee Quality?

All products are manufactured in compliance with international and domestic standards including ASME, DIN and GB, and undergo rigorous material composition testing, dimensional inspection, as well as hydrostatic and air pressure testing.

3:Are You a Trading Company or Manufacturer?

We are a professional manufacturer.

4:What Services Can We Offer?

We provide flexible OEM & ODM customization services. We can fabricate products of various specifications, pressure classes and connection types in accordance with customers’ drawings, project requirements or special working conditions.

5:Why Choose Us Over Other Suppliers?

We have built a mature global supply chain system featuring consistent stable quality, competitive direct factory prices, fast lead times and full-spectrum import and export services.

6: Why select F316L slip-on flange instead of F316 for offshore pipelines?

 Offshore environment has long-term salt fog & repeated pipeline welding. F316L low carbon prevents weld intergranular corrosion after multiple welding, avoiding pipeline cracking leakage during long sea service.