WITH NECK BUTTWELD ENDS FLANGES
Nominal Diameter:15~1600mm
NominalPressure:2.0~42.0MPa
Product material:304,304L,321,316,316L,(Needle type valve series)
WITH NECK BUTTWELD ENDS FLANGES (WN FLANGES)
High-Integrity Pipe Connection Solution for Critical Process Systems
Product Features & Applications
- Structural Strength:
- Integral neck design ensures superior stress distribution and torsional rigidity for high-pressure piping systems.
- Ideal for petroleum, chemical, energy, and heat exchanger applications requiring leak-tight connections under cyclic loading.
- Versatile Compatibility:
- ANSI B16.5 / ASME B16.47 / EN 1092-1 compliant, available in raised face (RF), ring-type joint (RTJ), or flat face (FF) configurations.
- Suitable for steam, gas, oil, and corrosive fluid services (temperatures up to 800°C/1472°F for high-alloy variants).
- Material Flexibility:
- Austenitic stainless steel: 304/304L, 321, 316/316L (resistant to pitting/crevice corrosion).
- Carbon steel: A105, A350 LF2 (for low-temperature or mild corrosion environments).
- High-temperature alloys: Inconel, Hastelloy, or specialized needle-type valve series steels (for severe thermal/chemical conditions).
Technical Specifications
| Parameter |
Details |
| Nominal Diameter |
DN15-DN1600 (1/2"-64") |
| Nominal Pressure |
PN20-PN420 (Class 150-2500) |
| Connection Type |
Butt-weld (BW) with neck |
| Face Finish |
125-250 AARH (RF), 32-63 μin Ra (RTJ grooves) |
| Dimensional Standards |
ASME B16.5, DIN 2632-2638, JIS B2220, GB/T 9112 |
Quality & Compliance
- Material Certifications:
- ASTM/ASME SA182, SA240, SA350 (steel grades).
- EN 10204 3.1B test reports (chemical composition, mechanical properties).
- PMI verification for alloy integrity.
- Manufacturing Standards:
- Forged construction (heavy-wall necks for high-fatigue applications).
- 100% NDT inspection (UT, PT, RT) + hydrostatic testing at 1.5x PN rating.
- Fire-safe design compliant with API 607/ISO 10497 (for RTJ variants).
- Approvals:
- ISO 9001:2015, PED 2014/68/EU, AD2000-Merkblatt W0.
Product Advantages
- Enhanced Durability:
- Forged neck geometry reduces weld-induced stress concentrations.
- Custom neck lengths available for thermal expansion compensation.
- Precision Engineering:
- CNC-machined surfaces ensure perfect gasket alignment and zero leakage.
- Optional coatings: PTFE, zinc, or electroless nickel plating for corrosion resistance.
- Global Adaptability:
- Dual-certified materials (e.g., 316L/S31603) for international project compliance.
- Laser-etched markings for permanent traceability.
Packaging & Support
- Packaging: Fumigated wooden crates with moisture barrier + steel edge protectors.
- Lead Time: 15-25 days (standard sizes); 30-40 days (custom alloys/dimensions).
- Documentation: Mill test certs, material traceability records, installation guides.
- After-Sales: Lifetime technical support + 2-year warranty against manufacturing defects.
Keywords: ASME B16.5 WN Flange, Stainless Steel Buttweld Flange, High-Pressure Forged Flange, RTJ Flanges, Heat Exchanger Flanges, A105 Carbon Steel Flange, Inconel Needle Valve Series Flange.
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