316L Stainless Steel WN RTJ Weld Neck Flange Class600, High Pressure Metal Seal Flange for Petrochemical Industry

316L WN RTJ Class600 high-pressure metal seal weld neck flange is a high-end special forged flange customized for extreme working conditions of petrochemical, oil and gas, and high-pressure coal chemical industries. Manufactured strictly in accordance with the highest precision ASME B16.5 standards, it adopts Class600 ultra-high pressure grade and RTJ ring-joint metal sealing structure, completely subverting ordinary RF gasket sealing and adapting to core petrochemical pipelines with high pressure, high temperature, strong scouring and severe pressure fluctuation. Made of thickened ASTM A182 F316L ultra-low carbon stainless steel forged billet and integrally closed-die forged, the product features extremely dense metallographic structure without porosity, cracks or inclusions, with superior compression resistance, impact resistance and high-temperature creep resistance than conventional flanges. The RTJ metal ring groove is precisely milled by five-axis CNC equipment with groove precision, flatness and concentricity fully compliant with international petrochemical standards. Matched with metal sealing rings, it achieves rigid zero-leakage sealing resistant to high-pressure extrusion, high-temperature aging and medium penetration. The ultra-long tapered stress-relief hub disperses concentrated stress of high-pressure pipelines, avoiding fatigue fracture at the flange root and adapting to 24-hour uninterrupted high-risk operation of oil and gas exploitation, petrochemical refining and high-pressure oil transmission pipelines. The ultra-low carbon material resists welding corrosion of petrochemical media with stable weld anti-corrosion performance without post-weld heat treatment. The full penetration weld supports 100% RT radiographic testing, fully meeting strict acceptance specifications for grade-A petrochemical projects and long-distance oil and gas pipelines.

Core Selling Points

1. Class600 ultra-high pressure grade adapts to extreme high-pressure petrochemical working conditions;

   2. RTJ metal ring rigid sealing achieves zero leakage, far superior to ordinary gasket sealing;

   3. Thickened 316L forged billet resists high temperature, creep and high-pressure impact;

   4. Five-axis precision milled ring groove with standard precision and excellent sealing adaptability;

   5. Ultra-long tapered stress-relief hub eliminates high-pressure stress cracking;

   6. Ultra-low carbon material resists petrochemical medium weld corrosion;

   7. 100% testable weld meets grade-A petrochemical project acceptance; 8. Excellent high temperature and pressure resistance, medium scouring resistance with ultra-long service life.

   
   

Application Scenarios

High-pressure oil exploitation pipelines, core petrochemical refining process pipelines, high-pressure oil and gas transmission pipe networks, coal chemical high-pressure reaction pipelines, natural gas high-pressure transmission projects, high-temperature and high-pressure equipment connections for petrochemical devices, oil and gas energy storage high-pressure pipelines, fine petrochemical high-pressure anti-corrosion systems.

Why Choose Us

As a designated manufacturer of high-pressure petrochemical special flanges, we focus on forging and precision machining of RTJ metal-sealed high-pressure flanges, equipped with five-axis precision processing equipment, high-pressure performance testing equipment and complete NDT instruments. All Class600 RTJ flanges adopt solid thickened forged billets without cutting corners, with ring groove precision, sealing performance and pressure resistance inspected piece by piece. We provide petrochemical-specific 3.1 MTR certificates, complete NDT reports and dimensional precision test reports, stably supplying large domestic petrochemical and overseas oil and gas EPC projects with authoritative quality acceptance.

Customization Capability

Custom non-standard RTJ ring groove sizes; custom ultra-high pressure thickened flange body; enhanced treatment for high temperature and high pressure working conditions; high-precision sealing processing for petrochemical use; exclusive laser traceability marking for projects; third-party authoritative pressure and flaw detection; custom high-pressure flanges of special materials; special packaging for export petrochemical projects.

FAQ

1:How long is the custom lead time for stainless steel flanges in Wenzhou?

— 8 to 10 working days

2:What is the fastest delivery time?

— 3 working days

3:Do you support non-standard custom flanges?

— Yes, we do.

4:Can you process special sizes?

— Yes. Max processing size: 4000 mm, Min processing size: 30 mm.

5:Do you have stainless steel flanges of standard sizes in stock?

— Yes.

6:Can we customize flanges based on customer drawings or samples?

— Yes.

7:Will material test certificates and inspection reports be provided for the purchased flanges?

— Yes, they will.

8:Is there a quality warranty for the flange products?

— Yes.

9:How to handle quality defects if they occur?

— Product return and exchange available.

10.Why prefer RTJ sealed flanges for high-pressure petrochemical pipelines?

—RTJ metal rigid sealing withstands ultra-high pressure and high-temperature impact without gasket aging and leakage risks, with far higher safety and stability than RF sealed flanges for high-risk core petrochemical pipelines.