316L WN RF Class300 medium-pressure weld neck flange is an upgraded forged fitting designed for continuous medium-pressure chemical working conditions. With higher pressure rating than Class150, it delivers stronger bearing capacity for long-term stable operation of chemical production lines, water treatment equipment and medium-pressure fluid transmission systems. Made of ASTM A182 F316L ultra-low carbon molybdenum stainless steel billet and integrally closed-die forged, the product features dense and stable metallographic structure with improved compression resistance, scouring resistance and alternating load resistance, eliminating common problems such as warping, deformation and leakage under medium pressure. The ultra-low carbon property avoids welding sensitization, maintaining excellent intergranular corrosion resistance after repeated on-site welding without secondary heat treatment, greatly reducing construction difficulty. The thickened tapered hub disperses medium-pressure impact and thermal cycle stress to extend pipeline fatigue life, suitable for 24-hour continuous chemical operation. The high-precision RF raised face fits perfectly with various chemical gaskets for long-term anti-penetration and anti-corrosion performance. The full penetration weld supports 100% NDT inspection with stable welding performance, meeting high-end engineering standards for petrochemical, fine chemical, pharmaceutical and environmental water treatment projects. With thicker body and higher structural strength than low-pressure flanges, Class300 flanges resist medium scouring and pressure fluctuation better, serving as the most cost-effective and stable choice for medium-pressure corrosive conditions. We strictly control forging ratio and heat treatment process, conducting mechanical performance sampling and PMI inspection for every batch.
Core Selling Points
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Class300 medium-pressure grade with higher bearing capacity than Class150;
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316L ultra-low carbon molybdenum steel resists chemical corrosion and weld sensitization;
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Thickened integral forging improves scouring, deformation and fatigue resistance;
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No corrosion after repeated welding, ideal for pipeline renovation;
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High-precision RF face ensures zero leakage under medium pressure;
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100% NDT available for high-end chemical project approval;
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No post-weld heat treatment saves construction cost and time;
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Stable performance for 24-hour continuous chemical operation.
Application Scenarios
Fine chemical medium-pressure production lines, pharmaceutical medium-pressure process pipelines, chemical wastewater treatment high-pressure networks, daily chemical deep processing pipelines, desulfurization and denitrification medium-pressure systems, salt water circulation pipelines, chemical pipeline renovation projects, small and medium-sized petrochemical auxiliary pipelines.
Why Choose Us
With years of experience in 316L medium-pressure chemical flange production, we master core technologies of thickened forging, stress relief and precision machining to avoid common deformation and leakage defects of ordinary flanges. All Class300 products are made of thickened solid billets with standard mechanical properties. We provide complete chemical engineering acceptance documents including MTR certificates, NDT reports, dimension inspection reports and heat treatment records, stably supplying bulk orders for global chemical EPC projects.
Customization Capability
Custom thickened flanges for medium-pressure chemical service; non-standard large-diameter Class300 flange processing; enhanced passivation for strong chemical corrosion; high-precision sealing surface grinding; custom non-standard sizes for pipeline renovation; batch laser traceability marking; third-party mechanical performance testing; custom weld bevel adaptation.
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 choose Class300 flanges for chemical medium-pressure pipelines?
—Class300 flanges have thicker wall and higher structural strength to resist long-term medium scouring and pressure fluctuation, eliminating warping and leakage risks of low-pressure flanges.
