The DIN 2635 standard specifies PN 25 Forged Steel Weld Neck Flanges, engineered for high-pressure durability. Characterized by a tapered hub, these flanges provide a smooth transition into the pipe wall, minimizing stress concentrations at the weld. Commonly forged from C22.8 or P250GH, they are essential for steam, gas, and oil transmission where vibration and thermal expansion occur. Though integrated into the EN 1092-1 system, the DIN 2635 designation remains a staple for heavy-duty industrial maintenance.
Technical Attributes: DIN 2635 PN 25
Standard,DIN 2635 (Vorschweißflansche)
Flange Type,Type 11 (Weld Neck)
Pressure Rating,PN 25 (25 bar / 2.5 MPa)
Common Carbon Steel,C22.8 / P250GH / St 52-3
Stainless Material,1.4571 / 1.4404 (316L)
Size Range,DN 10 to DN 1000
Manufacturing,Open or Die Forged
Facing Standard,DIN 2526 (Form C Raised Face)
RF Height,2mm (Standard for PN 25)
Connection Method,Butt-weld transition
Weld Preparation,DIN 2559 (Beveled edge)
Yield Strength,Min. 250 MPa (at room temp)
Heat Treatment,Normalizing (for carbon steel)
Impact Energy,Min. 27 J at -20°C (Material dependent)
Drilling Template,Metric bolt circle
Bolt Hole Qty (DN100),8 Holes
Certification,EN 10204 3.1
Primary Usage,Boiler & Pressure Vessel systems
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