EN10222-5 1.4401 WN Flange

QS Flange: Zhejiang EN10222-5 1.4401 WN Flange

Forged weld neck flange to EN 10222-5 in 1.4401 (F316), 4 inch Class 300LB raised face, rated 205 MPa yield and 515 MPa tensile.

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One-Minute Overview

Forged weld neck flange to EN 10222-5 in 1.4401 stainless steel, 4 inch, Class 300LB.
Tapered hub spreads stress gradually, so cyclic loading does not collect at the weld.
Yield strength of 205 MPa and tensile strength of 515 MPa in the forged body.
Raised face concentrates gasket pressure for a tight seal in Class 300 systems.

The EN10222-5 1.4401 weld neck flange is a forged pressure part for 4 inch lines in Class 300LB service. Material 1.4401 is the European designation for F316 austenitic stainless steel, with chromium at 16.0 to 18.0 percent and nickel at 10.0 to 14.0 percent. The raised face gives the gasket a defined seating band, and the hub transitions into the pipe without a step.

Name: EN10222-5 1.4401 WN Flange
Size: 4 Inch
Pressure: 300LB
Material: F316 (1.4401)
Type: WN
Flange Face: RF
Process Method: Forged
Feature: Strong Stiffness, Good Sealing, Corrosion Resistance
Usage: High Temperature, High Pressure and High Sealing Requirements
Standard: EN 10222-5

The weld neck profile carries a tapered hub, so wall thickness builds up gradually from pipe to flange and the weld sits in a calmer stress field. Under cyclic loading that geometry is what keeps fatigue damage away from the joint. Forging refines the grain, and the page data gives the body a minimum yield strength of 205 MPa and a tensile strength of 515 MPa. The molybdenum content of 2.00 to 3.00 percent is what lifts resistance to pitting and crevice corrosion in chloride-rich media, and 16.0 to 18.0 percent chromium with 10.0 to 14.0 percent nickel gives oxidation resistance up to 870°C.

For assembly, match the raised face to the mating flange and its gasket, then bring the joint up in stages with a star pattern so the gasket compresses evenly. The 4 inch Class 300LB combination suits process lines and equipment connections where pressures and temperatures both run high. Because the material is specified to EN 10222-5, the flange is bought against a European forging standard rather than a dimensional one, so quote the drawing and the pressure class together when you enquire.

FAQ

Q1. What is 1.4401, in plain terms?

It is the EN number for F316 austenitic stainless steel: 16.0 to 18.0 percent chromium, 10.0 to 14.0 percent nickel and 2.00 to 3.00 percent molybdenum. The molybdenum is what makes it stubborn about pitting and crevice corrosion in chloride-rich media, and the nickel level keeps the austenitic structure stable.

Q2. Why does the hub shape matter under cyclic loading?

A weld neck hub tapers from the pipe wall up to the flange body, so stiffness changes gradually instead of jumping at a corner. Stress has somewhere to spread. Under repeated pressure or thermal cycles that geometry keeps fatigue damage out of the weld, which is where a joint usually fails when the transition is abrupt.

Q3. 870°C oxidation resistance — is that a working temperature?

It is the oxidation limit for the material, not an invitation to run a Class 300LB flange at that temperature. Pressure ratings fall as temperature rises, so the working limit comes from the rating table for your class and your actual temperature. Treat 870°C as the material's ceiling and size the joint from the rating data.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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