Technical specifications and application of DIN 2637 flanges
The DIN 2637 standard defines structural parameters and technical requirements for weld-neck flanges rated for a nominal pressure of 100 bar (PN 100). These fittings are designed for use in high-pressure piping systems with diameters ranging from DN 10 to DN 350.
The design consists of a disk with holes for fasteners (bolts or studs) and a conical neck (hub) that ensures a smooth cross-sectional transition and a reliable butt-weld connection to the pipe. This configuration minimizes stress concentration in the joint area, which is critical for operations under high loads.
EV Group China supplies flanges manufactured in strict accordance with DIN 2519 regulations regarding quality and marking. Sealing surface types are determined by the DIN 2526 standard.
Materials and operational properties
- Stainless corrosion-resistant steels;
- Carbon structural steels;
- High-strength alloy steels;
- Heat-resistant steel grades for high-temperature service.
When using flanges made of C22 steel, the nominal pressure is maintained at medium temperatures up to 120°C. In the temperature range from 120°C to 300°C, the design strength parameters are adjusted to account for the reduction in the material’s yield strength.
Important Note: The DIN 2637 standard is historical and is currently considered obsolete. Modern production standards adopted by EV Group China are aligned with the current DIN EN 1092-1 (type 11B) regulation, which fully replaces the requirements of DIN 2637.