Seamless Welded Integrity for Critical Applications
Product Description:
Our Weld Neck Flanges (EN 1092-1 Type 35 / DIN 2635 Type 35) are engineered for high-pressure, high-temperature, and high-vibration environments. Featuring a tapered hub and butt-weld end, they eliminate stress concentration at the pipe-to-flange junction, ensuring lifelong reliability in critical pipeline systems.
Key Features & Advantages:
✅ Zero Stress Concentration
– Smooth tapered hub transitions stress from flange to pipe, reducing localized stress by >90% and enhancing fatigue resistance.
✅ Military-Grade Sealing
– Full-penetration butt welds achieve metallurgical bonding, suitable for vacuum to ultra-high pressure (PN160/Class 2500).
✅ Corrosion Resistance
– Compatible with homogeneous welding (e.g., 316L-to-316L), eliminating galvanic corrosion risks.
✅ Dynamic Performance
– Superior vibration/thermal cycle resistance for compressors, boilers, and marine propulsion systems.
✅ Global Standard Compliance
– Conforms to EN 1092-1:2018, DIN 2635, and ASME B16.5 (Class ratings available).
Technical Specifications:
| Parameter | Specification |
| Standard | EN 1092-1 Type 35 / DIN 2635 Type 35 |
| Pressure Ratings | PN6 to PN160 (EN) / Class 150 to 2500 (ASME) |
| Materials | Carbon Steel (P265GH), Stainless Steel (316Ti/1.4571), Duplex Steel (1.4462), Nickel Alloys (Hastelloy® C276) |
| Quality Control | 100% PT/MT Testing (RT/UT certifications available) |
| Facing Types | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) |
| Temperature Range | -196°C to +800°C (material-dependent) |
Industry Applications:
► Energy: Gas turbine inlets, nuclear cooling systems
► Chemical Processing: High-pressure reactor lines, corrosive fluid transfer
► Marine: Main engine exhausts, LNG cryogenic pipelines
► Oil & Gas: Wellhead assemblies, SCADA trunk lines
Note: Premium alternative to Slip-On or Lap Joint flanges, reducing lifecycle costs by up to 40%.
Why Choose Type 35 Over Type 32?
| Feature | Type 35 (Weld Neck) | Type 32 (Collar Plate) |
| Max Pressure | PN160 | PN40 |
| Stress Distribution | Optimized via tapered hub | Moderate (direct collar weld) |
| Fatigue Resistance | ★★★★★ | ★★★☆☆ |
| Vibration/Variable Load Suitability | Yes | Limited |
Certification & Traceability:
‣ Material Certificates: EN 10204 3.1/3.2
‣ Compliant with PED 2014/68/EU & ASME B31.3
‣ Laser-etched markings (Standard, Material, Pressure Rating)
Download Resources:
✧ [DN-PN Dimensional Datasheet]
✧ [Material Selection Guide]
Request Quote: Specify DN, PN, Material, Facing, and Quantity.