304 Stainless Steel WNRF Weld Neck Flange is a core forged pipe fitting widely used in industrial fluid piping systems. Manufactured in strict accordance with ASME B16.5 standards with Class150 low-pressure rating and raised face (RF) sealing structure, this flange adopts integral closed-die forging technology. Different from plate-cut flanges, it features dense and uniform internal metallographic structure without pores, sand holes or layered cracks. The unique tapered hub design effectively buffers pressure fluctuation, mechanical vibration and alternating temperature stress during pipeline operation, fundamentally avoiding flange deformation, cracking and leakage risks. Made of genuine ASTM A182 F304 austenitic stainless steel billet, the product undergoes CNC high-precision turning, end finishing, pickling and passivation treatment. The flatness, perpendicularity and bolt hole position of the sealing surface fully comply with international tolerance standards. The full penetration butt weld structure supports radiographic testing after welding, fully meeting global engineering acceptance specifications. With excellent atmospheric corrosion resistance and stable performance in mild acid and alkali environments, this cost-effective flange is ideal for long-term continuous operation of conventional industrial pipelines, widely applied in municipal engineering, light industry, general chemical and HVAC projects.
Core Selling Points:
1.Integral closed-die forging with dense metallurgy, higher structural strength than plate-cut flanges;
2. Tapered stress-relief hub resists vibration and fatigue for alternating pipeline working conditions
3. Standard RF face compatible with spiral wound, PTFE and rubber gaskets;
4. Genuine 304 austenitic steel with stable anti-corrosion performance;
5. Full penetration weld supports RT non-destructive testing for engineering approval;
6. Full size in stock from NPS1/2” to NPS24 for fast delivery;
7. Strict ASME tolerance for global interchangeability;
8. Factory passivation treatment for superior oxidation and corrosion resistance.
We are a professional stainless steel forging flange manufacturer with 15 years of experience in high-end pipe fitting production. All WN flanges are made of solid forged billets to eliminate layered risks of plate-cut products. Equipped with large CNC vertical lathes, precision machining centers, PMI detectors and NDT equipment, we conduct full material, dimension and sealing precision inspections for every batch. Certified by ISO9001, we provide EN10204 3.1 MTR certificates, factory inspection reports and NDT documents for global engineering acceptance. No middleman markup, we support small trial orders, bulk project orders and long-term foreign trade cooperation with stable quality and lead time.
Custom non-standard outer diameter, inner diameter and thickness; switchable RF/FF/MFM sealing faces; laser engraving of LOGO, heat number, standard and project code; thickened flange body for higher pressure resistance; customized polishing and enhanced passivation; third-party inspection support and custom export packaging; custom special pressure-grade non-standard flanges.
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:what is the core difference between weld neck flange and slip on flange?
—WN flange has a tapered stress-relief hub with higher pressure and temperature resistance and weld testability, suitable for critical pressure pipelines, while slip on flanges are only for low-pressure non-critical service.
