Technical features of the DIN 2635 standard
The DIN 2635 standard defines the parameters for welding neck flanges designed for butt welding at a working pressure of 40 kgf/cm² (PN 40). The products cover a range of nominal diameters from DN 10 to DN 500 and are used in critical piping systems, tanks, and pressure vessel equipment.
Structurally, the flange consists of a disc with holes for fasteners and a tapered neck that provides a smooth transition to the pipe being welded. This geometry minimizes stress concentration in the weld zone and increases the reliability of the joint under cyclic loads.
EV Group China supplies flanges that comply with strict production protocols regulating the geometry of sealing surfaces and weight tolerances. All products undergo verification for compliance with marking and quality standards (DIN 2519), and seals are selected according to the requirements of DIN 2526.
Materials and performance characteristics
- Stainless steels (austenitic, ferritic, duplex).
- Carbon steels for general industrial use.
- Alloy steels for pressure-bearing applications.
- Heat-resistant grades for high-temperature environments.
Flange connections made of C22 grade steel, manufactured according to this standard, fully retain their strength characteristics at operating temperatures up to 120°C. When the temperature increases in the range from 120°C to 300°C, EV Group China specialists recommend taking into account the metal yield strength reduction factor when calculating the maximum operating pressure.
Important note: The DIN 2635 standard is historical and has been archived. Modern engineering solutions and supplies from EV Group China are based on the current DIN EN 1092-1 standard (type 11B), which fully replaces the obsolete DIN 2635 specifications.