PLSteel Pipe FlangesPlate Flange (PL)
Flat-type flange with simple structure, light weight and low cost — ideal for low-pressure pipeline systems.
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Welding Neck Flange (WN)
High-pressure flange with tapered neck and butt-weld connection — the standard for critical HPHT service.
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WNSteel Pipe Flanges
Overview
Weld Neck Flange (WN) is a high-pressure flange with a long neck and smooth transition between the flange and the pipe, widely used in high-pressure, high-temperature and high-vibration pipeline systems. It is connected to the pipe by butt welding, which effectively reduces stress concentration and ensures tight, stable pipeline connections in the most demanding industrial applications.
Size Range
½" – 80"
Pressure Class
Class 150 – 2500 / PN10 – PN100
Key Features
- Long tapered hub for stress distribution
- Butt-weld connection for maximum integrity
- Excellent fatigue and vibration resistance
- RF, RTJ, FF and MFM facing options
- Rated up to Class 2500 / PN100
Benefits
- Highest structural integrity of all flange types
- Lowest stress concentration at pipe joint
- Preferred for cyclic and high-vibration service
Specifications
| Standards | GB/T 9115, ASME B16.5, API 605, EN 1092-1 |
| Pressure Ratings | Class 150 – 2500 / PN10 – PN100 |
| Nominal Diameter | DN15 – DN2000 (NPS ½" – 80") |
| Working Temperature | -40°C – 600°C |
| Connection | Butt weld per ASME B16.25 |
Applications
Oil and gas transmissionPetrochemical and refiningPower generation and nuclearHigh-pressure steam and process lines
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Standards
- • ISO 7005
- • ASME B16.5
- • EN 1092-1
- • DIN 2501
- • JIS B2220
- • GB/T 9115–9119
- • HG/T 20592
- • API 605
Materials
- • Carbon Steel: A105, 20#, Q235B, A234 WPB
- • Stainless Steel: 304, 304L, 316, 316L, 321
- • Alloy Steel: 16Mn, F11, F22, 15CrMo
- • Duplex & Super Duplex: F51, F53, 2205
- • Special alloys: Monel, Hastelloy, Titanium (on request)
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