Yuhong Group Co.,Ltd
| Payment Terms | L/C, T/T |
| Delivery Time | 7DAYS |
| Packaging Details | PLYWOOD CASE,BUNDLE,PALLET |
| TYPE | SORF,SOFF,WNRF,WNFF,BLIND,LWNRF |
| MATERIAL | F321 |
| PACKAGE | PLYWOOD CASE,PALLET |
| SIZE | 1/2"--98" |
| CLASS | 150LBS, 300LBS, 600LBS, 900LBS, 1500LBS, 3000LBS, 5000LBS, 10000LBS, 15000LBS |
| NDT | UT,PT |
| Brand Name | YUHONG |
| Model Number | ASTM A105, ASTM A 182, GR F1, F11, F22, F5, F9, F91, A182 F 304, 304L, 304H, 316, 316L,321 |
| Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C, T/T | Delivery Time | 7DAYS |
| Packaging Details | PLYWOOD CASE,BUNDLE,PALLET | TYPE | SORF,SOFF,WNRF,WNFF,BLIND,LWNRF |
| MATERIAL | F321 | PACKAGE | PLYWOOD CASE,PALLET |
| SIZE | 1/2"--98" | CLASS | 150LBS, 300LBS, 600LBS, 900LBS, 1500LBS, 3000LBS, 5000LBS, 10000LBS, 15000LBS |
| NDT | UT,PT | Brand Name | YUHONG |
| Model Number | ASTM A105, ASTM A 182, GR F1, F11, F22, F5, F9, F91, A182 F 304, 304L, 304H, 316, 316L,321 | Certification | ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008 |
| Place of Origin | CHINA | ||
| High Light | B16.5 Steel Flanges ，F321 Steel Flanges ，A182 Steel Flanges | ||
STAINLESS STEEL LONG NECK WNRF FLANGE,A182 F321 B16.5 CLASS 300
A Long Neck Flange (also known as Long Weld Neck Flange or LWN Flange) is a specialized type of flange designed for high-pressure and high-temperature applications. It has a long, tapered neck that gradually transitions from the flange thickness to the pipe or vessel wall thickness.
Key Features:
| Feature | Description |
| Extended Neck | Long tapered hub provides reinforcement and reduces stress at the weld point. |
| Welded Connection | Typically butt-welded to the piping system or pressure vessel. |
| Integral Reinforcement | Neck acts like a nozzle, improving strength in pressure vessels. |
Smooth Stress Distribution:
The long tapered hub reduces stress concentration between flange and pipe/vessel.
Ideal for Pressure Vessels:
Commonly used where nozzles connect to tanks or pressure vessels.
High Strength:
Suitable for high-pressure and cyclical loading conditions.
Good Weldability:
Allows for full-penetration butt welds for structural integrity.
Common Standards:
ASME B16.5 (for standard sizes)
ASME B16.47 (for larger diameters)
Custom dimensions for vessel nozzles (often matched to vessel design)
| Industry | Use Case |
| Petrochemical / Oil & Gas | Nozzles on pressure vessels and heat exchangers. |
| Power Plants | High-pressure steam, feedwater, and process lines. |
| Chemical Industry | Corrosive and high-temperature fluid handling. |
| Offshore Platforms | High-stress piping systems. |
Titanium Stabilized:
Prevents sensitization (carbide precipitation at grain boundaries) during welding.
Makes it superior to 304 in welded structures exposed to temps between 425–870°C (800–1600°F).
High Temperature Resistance:
Good creep strength and oxidation resistance up to ~900°C (1650°F).
Good Mechanical Properties:
Similar strength to 304 and 316, with added stability for high-heat applications.
Corrosion Resistance:
Comparable to 304 in most environments, but better for high-temperature aqueous environments.
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer,Exporter,Trading Company,Seller,Other
Year Established:
2007
Total Annual:
50M-70M
Employee Number:
50~850
Ecer Certification：
Verified Supplier
YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9... YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9...
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