316L Stainless Steel WN RF Class150 Weld Neck Flange ASME B16.5, Low Carbon Corrosion Resistant General Chemical Flange

This 316L WN RF Class150 weld neck flange is manufactured strictly in accordance with ASME B16.5 standards and adopts ASTM A182 F316L ultra-low carbon stainless steel with carbon content controlled below 0.03%, completely eliminating welding sensitization and intergranular corrosion risks. Adopting integral closed-die forging technology, the product features dense and uniform metallographic structure without pores, delamination or cracks, delivering far better mechanical strength and structural stability than plate-cut flanges. The RF raised face is the most versatile sealing type, compatible with PTFE, spiral wound and rubber gaskets for easy installation and wide interchangeability. The tapered weld neck effectively relieves alternating stress, mechanical vibration and thermal stress during pipeline operation, preventing root cracking and medium leakage for long-term stable service. With molybdenum alloy composition, 316L steel provides superior resistance to chloride, weak acid, weak alkali and salt fog corrosion compared with 304 stainless steel, ideal for chemical, water treatment, light industry and HVAC systems. All products are processed by CNC precision turning, surface finishing and acid passivation, meeting international tolerance standards for seamless global interchangeability. The full penetration butt weld supports RT and UT non-destructive testing, requiring no post-weld solution heat treatment to maintain stable anti-corrosion performance, greatly saving construction time and cost. As a mainstream low-pressure industrial pipe fitting, this flange features high cost performance, stable quality and wide adaptability, widely used in foreign trade engineering, complete equipment and municipal fluid pipe networks. As a direct forging manufacturer, we provide full PMI inspection, dimensional verification and NDT testing for every batch to ensure reliable quality.

General chemical low-pressure process pipelines, municipal sewage treatment networks, industrial circulating water systems, food and light industry fluid pipelines, industrial HVAC systems, salt fog environment equipment connections, environmental auxiliary pipelines, complete set of export equipment pipe fittings.

We are a professional 316L stainless steel forging flange factory with 15 years of experience in ASME standard WN flange production. All products are forged from solid billets to avoid plate-cut delamination defects. Equipped with CNC lathes, precision machining centers, PMI detectors and NDT equipment, we control the whole production process. We provide EN10204 3.1 MTR certificates, factory test reports and NDT records, supporting global third-party inspection and project acceptance. We undertake bulk export orders and engineering customized orders with stable lead time and factory direct price.

Custom non-standard OD, ID and thickness; customized reinforced thickened body and extended hub; switchable RF/FF/MFM sealing faces; laser engraving of logo, heat number, standard and project code; food-grade mirror polishing and enhanced passivation; custom weld bevel and special length; fumigated wooden case and vacuum anti-rust export packaging; support third-party inspection certification.

10： What is the difference between 316L and 304L WN flange?

 —316L contains molybdenum for superior resistance to chloride, seawater and chemical corrosion, suitable for humid and corrosive working conditions, while 304L is only for general atmospheric environments.