EN1092-1 F316L Stainless Steel Flate Face Plate Flange PN2.5-PN100, DN10-DN600

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EN1092-1 F316L Stainless Steel Flate Face Plate Flange PN2.5-PN100, DN10-DN600

The EN1092-1 F316L Stainless Steel Flat Face Plate Flange is a European-standard circular steel flange manufactured in accordance with EN 1092-1, the European standard for steel flanges and their connections. Designated as Type 01 (plate flange for welding), this flange is a flat, circular steel disc with bolt holes around the perimeter, featuring no hub and no raised face. 

This product covers 24 nominal size specifications from DN10 to DN600, with pressure ratings spanning 8 classes from PN2.5 to PN100 (PN2.5/6/10/16/25/40/63/100). Compared with raised‑face (RF) flanges, this flat‑face flange requires the use of a full‑face gasket, which distributes the bolt preload evenly across the entire contact surface of the gasket. It is particularly suitable for connections to brittle or low‑strength equipment nozzles made of cast iron, plastic, or FRP, as well as for general industrial piping under medium‑to‑low pressure and non‑severe thermal cycling. Its “slip‑on” configuration greatly simplifies pipe alignment during installation and offers a cost advantage over weld‑neck (WN) flanges. This product is widely used for flange connections in medium‑to‑low pressure industrial piping systems across chemical and petrochemical, marine and offshore, water treatment, food and pharmaceutical, power generation, HVAC, and fire protection applications.

Chemical & Mechanical Properties

Mechanical Properties

Key Adventages

• Superior corrosion resistance – the 2.0-3.0% molybdenum content provides exceptional resistance to pitting, crevice corrosion, and chloride attack, making it ideal for marine, chemical, and aggressive fluid environments.
• Excellent weldability and sensitization resistance – the low carbon content (≤0.030%) prevents chromium carbide precipitation during welding, eliminating the need for post-weld heat treatment and ensuring long-term joint integrity.
• Uniform load distribution – the flat face design with full-face gasket ensures even bolt preload across the entire sealing surface, preventing overloading and damage to brittle equipment nozzles made of cast iron, plastic, or FRP.

Key Applications

• Chemical and petrochemical piping systems
• Marine and offshore environments
• Pharmaceutical and food processing industries
• Water treatment and desalination plants
• Fire protection piping systems
• HVAC and general industrial services HVAC
• Low to medium pressure, non-critical service piping