GB/T9113 ASTM A182 F304 PN16 RF Welding Neck Flange is integral hot forged butt-weld pipe flange, the most mainstream stainless steel WN fitting for medium-pressure general corrosive industrial piping. Different from slip-on flange, it adopts tapered neck transition structure, uniform wall thickness seamless butt welding connection, effectively disperse pipeline vibration and pressure stress, avoid welding crack and pipeline leakage for long-term operating pipe network. Made of virgin 304 austenitic stainless steel, no scrap blending, passed full spectral inspection, stable anti-rust performance for water, weak acid, humid workshop working conditions.
Tapered neck gradual thickening design optimizes stress transmission, greatly improve pipeline connection stability compared with plate flange. Standard 2mm RF raised face, matched with common rubber gasket and PTFE gasket, reliable sealing for domestic water, industrial circulating water, weak corrosive solvent medium. CNC integrated machining for bolt holes, ±0.1mm tolerance, fully compatible with GB standard piping mating parts, no on-site hole modification needed. Whole body acid pickling passivation treatment forms dense anti-corrosion film, anti-oxidation, anti-rust for indoor workshop and outdoor mild exposed installation.
Full production process: die forging, stress relief annealing, precision turning, hole drilling, surface passivation, full finished inspection. Passed hydraulic tightness test, ultrasonic flaw detection, flatness inspection to eliminate forging defects. Stock size DN15-DN600, PN16 1.6MPa rated working pressure. Support custom logo marking, non-standard neck size, special bolt pitch processing. Widely used for factory circulating pipe, water treatment pipeline, food auxiliary piping, municipal corrosive water pipe connection. Offer MTC material certificate, neutral export packing, 15-month factory warranty, bulk wholesale factory price.
Core Spec: Standard: GB/T9113; Pressure: PN16; Face: RF; Material: ASTM A182 F304 Stainless Steel; Process: Die Forged + Pickling Passivation; Size: DN15-DN600; Connection: Butt Weld
FAQ: Q: Why choose WN flange instead of slip on flange? A: WN flange has tapered neck stress buffer, better pressure resistance and anti-vibration performance for permanent piping connection.
