Weld Neck Flange – Industrial Flange Manufacturer & Supplier
Product Overview
Weld neck flanges feature a long tapered hub designed for high-pressure piping systems.
Key Applications
Oil & Gas pipelines
Petrochemical plants
Power generation systems
Water treatment facilities
Industrial pressure piping
Common Materials
Carbon Steel: ASTM A105, A350 LF2
Stainless Steel: ASTM A182 F304, F316
Alloy Steel: ASTM A182 F11, F22
Pressure Ratings
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500
Face Types
RF – Raised Face
FF – Flat Face
RTJ – Ring Type Joint
FAQ
Q: What is this flange used for?
A: It is widely used in industrial piping systems including oil & gas, chemical plants, and power plants.
Q: Which standards apply to this flange?
A: Common standards include ASME B16.5, ASME B16.47, EN 1092-1 and GB/T flange standards.
Q: Which materials are available?
A: Typical materials include carbon steel, stainless steel, and alloy steel grades.
Q: Where can I buy industrial flanges?
A: Industrial flanges can be supplied by forged flange manufacturers and flange suppliers worldwide.
Weld Neck Flange (WN) Full Specification
1. Basic Information
- Product Name: Weld Neck Flange
- Short Name: WN Flange
- Standard:
- ASME B16.5, ASME B16.47
- GB/T 9115, HG/T 20592, HG/T 20615
- EN 1092-1
- Application: Oil & gas, pipeline, pressure vessel, high temperature & high pressure piping system
2. Pressure Ratings
- Class Series (US Standard):
Class 150, 300, 600, 900, 1500, 2500
- PN Series (Metric / European):
PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160
3. Face Type (Sealing Surface)
- RF: Raised Face
- FF: Flat Face
- RTJ / RJ: Ring Type Joint
- M/F: Male / Female
- T/G: Tongue / Groove
4. Main Materials
- Carbon Steel:
A105, A234 WPB, Q235B, 20#, 16Mn
- Stainless Steel:
304/L, 316/L, 321, 904L
- Alloy Steel:
A182 F11, F22, F5, F9, F91
5. Nominal Size Range
- NPS: 1/2″ – 48″
- DN: DN10 – DN1200
6. Dimensions (Key Items)
ASME B16.5 WN RF – Class 150
| NPS | DN | OD (D) | K | L | n | C |
| 1/2 | 15 | 95 | 66.7 | 16 | 4 | 11.1 |
| 3/4 | 20 | 115 | 82.6 | 16 | 4 | 12.7 |
| 1 | 25 | 125 | 88.9 | 16 | 4 | 14.3 |
| 1.5 | 40 | 155 | 114.3 | 18 | 4 | 17.5 |
| 2 | 50 | 165 | 127.0 | 18 | 4 | 19.0 |
| 3 | 80 | 200 | 168.3 | 18 | 8 | 23.8 |
| 4 | 100 | 230 | 190.5 | 18 | 8 | 25.4 |
| 6 | 150 | 280 | 241.3 | 22 | 8 | 28.6 |
| 8 | 200 | 345 | 298.5 | 22 | 12 | 31.8 |
| 12 | 300 | 485 | 425.5 | 26 | 16 | 41.3 |
HG/T 20592 WN RF – PN16
| DN | OD (D) | K | L | n | C |
| 15 | 95 | 65 | 14 | 4 | 16 |
| 20 | 105 | 75 | 14 | 4 | 18 |
| 25 | 115 | 85 | 14 | 4 | 18 |
| 40 | 150 | 110 | 18 | 4 | 18 |
| 50 | 165 | 125 | 18 | 4 | 20 |
| 80 | 200 | 160 | 18 | 8 | 24 |
| 100 | 220 | 180 | 18 | 8 | 24 |
| 150 | 285 | 240 | 22 | 8 | 26 |
| 200 | 340 | 295 | 22 | 12 | 28 |
| 300 | 460 | 410 | 26 | 12 | 32 |
7. Marking (Standard Export Marking)
- Size
- Class / PN
- Material
- Standard
- Heat No.
- Manufacturer mark
8. Packaging & Delivery
- Packing: Wooden case / plywood pallet
- Marking: Shipping mark in English as required
- Application: Oil, gas, petrochemical, pipeline, power plant