ANSI B16.5 SS WN Flange
High-Quality ANSI B16.5 Stainless Steel Weld Neck Flanges for Industrial Piping Systems
SSM manufactures precision-engineered stainless steel weld neck flanges that fully comply with ANSI B16.5 standards, ensuring perfect compatibility with industrial piping systems worldwide. Our SS WN flanges are available in 304, 304L, 316, 316L, 321, and 347 grades for various pressure and temperature requirements.
ANSI B16.5 SS WN Flange Specifications
1. Standard Dimensions & Pressure Classes
| Nominal Size | Pressure Ratings | Face Types | Hub Dimensions |
|---|---|---|---|
| 1/2" - 24" (DN15 - DN600) | Class 150, 300, 400, 600, 900, 1500, 2500 | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) | Short & Long Pattern |
| Key Dimensions | Tolerance | Measurement | Standard |
| Outside Diameter (OD) | ±1.5mm | ASME B16.5 Table 5 | ANSI/ASME B16.5 |
| Bolt Circle Diameter | ±0.8mm | ASME B16.5 Table 6 | ANSI/ASME B16.5 |
| Thickness | +3.2mm/-0.8mm | ASME B16.5 Table 7 |
2. Material Specifications
| Grade | ASTM Standard | UNS Number | Typical Composition |
|---|---|---|---|
| 304 | A182 F304 | S30400 | 18Cr-8Ni |
| 304L | A182 F304L | S30403 | 18Cr-8Ni (Low C) |
| 316 | A182 F316 | S31600 | 16Cr-10Ni-2Mo |
| 316L | A182 F316L | S31603 | 16Cr-10Ni-2Mo (Low C) |
| 321 | A182 F321 | S32100 | 18Cr-10Ni-Ti |
| 347 | A182 F347 | S34700 | 18Cr-10Ni-Nb |
3. Pressure-Temperature Ratings
| Class | 150# | 300# | 600# | 900# | 1500# | 2500# |
|---|---|---|---|---|---|---|
| Max PSI @ 100°F | 275 | 720 | 1440 | 2160 | 3600 | 6000 |
| Max PSI @ 500°F | 180 | 550 | 1100 | 1650 | 2750 | 4580 |
Manufacturing & Quality Assurance
Production Process
Material Selection - Certified mill test reports
Forging - Closed-die hammer forging
Heat Treatment - Solution annealing (1050-1100°C)
Machining - CNC precision machining
Surface Treatment - Pickling & passivation
Quality Control Tests
Dimensional Inspection - 100% verification
PMI Testing - Positive Material Identification
Hardness Testing - Rockwell B scale
Visual Inspection - Per ASME B16.5
Hydrostatic Testing - Optional per request
Technical Advantages
✔ Precision Machined Weld Bevel - 37.5° bevel angle with 1.6mm root face
✔ Optimized Hub Design - Smooth transition reduces stress concentration
✔ Multiple Face Finishes - Stock, serrated, or smooth finishes available
✔ Full Material Traceability - Heat number tracking from raw material to finished product
Industry Applications
Oil & Gas
High-pressure pipelines
Wellhead equipment
Refinery process connections
Chemical Processing
Acid transfer systems
Reactor vessel connections
High-purity piping
Power Generation
Steam turbine connections
Boiler feedwater systems
Cooling water circuits
Available Configurations
Standard Options
Raised Face (RF) - Standard for most applications
Ring Type Joint (RTJ) - High-pressure sealing
Flat Face (FF) - Full-face gasket applications
Special Features
Extended Hubs - For special wall thickness requirements
Integral Reinforcements - For high-stress applications
Special Coatings - PTFE, nickel plating available
Why Choose SSM ANSI B16.5 WN Flanges?
• 30+ Years of metallurgical expertise
• Complete In-House Manufacturing from forging to finishing
• Global Certifications including PED, ASME, API, ISO 9001
• Competitive Pricing with volume discounts
• Technical Support for welding procedure development
Request Your Quote Today
Our engineering team provides:
Material selection guidance
WPS development support
Application-specific recommendations
CAD models and drawings
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