DIN 2502, 2503, and 2504 are historical German standards for PN16, PN25, and PN40 plate flanges, now largely integrated into EN 1092-1. When manufactured in Duplex 2205 or Super Duplex 2507, these flanges offer extreme corrosion resistance and nearly double the yield strength of standard stainless steels. They are engineered for aggressive environments like desalination, chemical processing, and marine offshore piping, providing a high-strength, lightweight alternative to bulky carbon steel designs.
technical attributes
Standards: DIN 2502 / 2503 / 2504
Material Grade: Duplex 2205 / Super Duplex 2507
UNS Designation: S31803 / S32205 / S32750
Flange Type: Plate (Slip-On)
Pressure Rating: PN16 / PN25 / PN40
Size Range: DN10 to DN2000
Manufacturing: Forged or Machined Plate
Facing Type: Form C (Raised Face)
Yield Strength: Min 450 to 550 MPa
Tensile Strength: 620 to 800 MPa
PREN Value: Min 35 (2205) / Min 40 (2507)
Microstructure: 50 percent Ferrite / 50 percent Austenite
Corrosion Resistance: High SCC Resistance
Carbon Content: Max 0.030 percent
Manganese Content: Max 2.00 percent
Connection: Double Fillet Weld
Certification: EN 10204 3.1
Service Temp: -50℃ to 250℃
Contact: Jorge Yang
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