Stainless Steel Weld Neck Flange
High-Performance Weld Neck Flanges for Critical Piping Systems
SSM specializes in manufacturing stainless steel weld neck flanges designed for high-pressure, high-temperature, and corrosive applications. Our weld neck flanges provide superior structural integrity, excellent fatigue resistance, and leak-proof performance in demanding industrial environments.
Stainless Steel Weld Neck Flange Specifications
1. Standard Dimensions & Pressure Ratings
| Size Range | Pressure Classes | Standards | Hub Dimensions |
|---|---|---|---|
| 1/2" - 24" (DN15 - DN600) | 150# - 2500# (PN6 - PN100) | ASME B16.5 | Long & Short hubs available |
| 26" - 60" (DN650 - DN1500) | 150# - 900# (PN6 - PN40) | ASME B16.47 Series A/B | Custom hub configurations |
2. Material Grades & Properties
| Grade | ASTM Spec | Yield Strength (MPa) | Features | Temp. Range (°C) |
|---|---|---|---|---|
| 304 | A182 F304 | 205 | General purpose | -196 to 800 |
| 316 | A182 F316 | 205 | Enhanced corrosion | -196 to 800 |
| 316L | A182 F316L | 170 | Low carbon, welded | -196 to 800 |
| 321 | A182 F321 | 205 | Stabilized grade | -196 to 800 |
| 347 | A182 F347 | 205 | Niobium stabilized | -196 to 800 |
3. Weld Preparation Details
| Parameter | Specification |
|---|---|
| Bevel Angle | 37.5° ± 2.5° |
| Root Face | 1.6mm ± 0.8mm |
| Weld Groove | V-type or U-type |
| Weld Overlay | Optional 309L for dissimilar metals |
Key Features & Benefits
✔ Optimized Stress Distribution - Smooth transition from hub to pipe reduces stress concentration
✔ Radiographic Quality Welds - Prepared bevel ensures full penetration welds
✔ Precision Machined - CNC-controlled tolerances (±0.05mm)
✔ Full Traceability - Mill test certificates with heat number tracking
✔ Multiple Face Finishes - Stock, serrated, or smooth finishes available
Manufacturing Excellence
Production Process
Forging - Closed-die forging for grain structure
Heat Treatment - Solution annealing for corrosion resistance
Machining - CNC turning and boring
Surface Treatment - Pickling & passivation
Quality Control - 100% dimensional verification
Quality Assurance Tests
Ultrasonic Testing for internal defects
Dye Penetrant Inspection for surface cracks
Hardness Testing (Rockwell B scale)
PMI Verification for material composition
Hydrostatic Testing (1.5x rated pressure)
Industry Applications
Oil & Gas
High-pressure pipelines
Wellhead equipment
Compressor stations
Refinery process piping
Chemical Processing
Reactor connections
Acid transfer lines
High-purity systems
Thermal fluid circuits
Power Generation
Steam turbine connections
Boiler feedwater systems
Cooling water piping
Flue gas desulfurization
Special Configurations
Custom Options
Extended Hubs for special wall thickness
Integral Reinforcements for high-stress areas
Clad Construction with corrosion-resistant overlay
Insulating Kits for cathodic protection
Special Coatings (PTFE, nickel plating)
Bolt Hole Patterns
ASME standard drilling
Metric pattern drilling
Slot-hole configurations
Custom hole arrangements
Why Choose SSM Weld Neck Flanges?
• 30+ Years of metallurgical expertise
• Complete In-House Manufacturing from forging to finishing
• Global Certifications including PED, ASME, API, ISO 9001
• Just-in-Time Inventory for fast delivery
• Technical Support for welding procedure development
Request Your Quote Today
Our engineering team provides:
Material selection guidance
Weld procedure specifications
Stress analysis support
Application-specific recommendations
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