ASME B16.5 Stainless Steel Flanges (½"–24")
ASME B16.5 Stainless Steel Flanges – Complete Technical Guide
Standardized Flanges for Industrial Piping Systems (½" to 24")
1. Key Specifications
| Parameter | Details |
|---|---|
| Standard | ASME B16.5 (Latest Edition) |
| Size Range | ½" to 24" (DN15 to DN600) |
| Pressure Classes | 150#, 300#, 400#, 600#, 900#, 1500#, 2500# |
| Materials | ASTM A182 (304/304L, 316/316L, 321, 347) |
| Face Types | Raised Face (RF), Flat Face (FF), Ring Joint (RTJ) |
| Temperature Range | -20°F to 1500°F (-29°C to 816°C) |
2. Flange Types & Applications
Weld Neck (WN)
Use: High-pressure/temperature systems (refineries, power plants)
Advantage: Reinforced hub for stress distribution
Slip-On (SO)
Use: Low-pressure utility piping (water, air)
Advantage: Easy alignment during installation
Blind (BL)
Use: Pipe end closures or inspection openings
Advantage: No bore machining required
Threaded (TH)
Use: Instrument connections, maintenance points
Advantage: No welding needed
Lap Joint (LJ)
Use: Systems requiring frequent disassembly
Advantage: Rotatable flange for alignment
3. Material Selection Guide
| Grade | ASTM Spec | Key Properties | Max Temp |
|---|---|---|---|
| 304/304L | A182 F304/F304L | General corrosion resistance | 1500°F (816°C) |
| 316/316L | A182 F316/F316L | Superior chloride resistance | 1500°F (816°C) |
| 321 | A182 F321 | Titanium stabilized (high-temp) | 1500°F (816°C) |
| 347 | A182 F347 | Niobium stabilized (welding) | 1500°F (816°C) |
4. Pressure-Temperature Ratings
| Class | 150# | 300# | 600# | 900# |
|---|---|---|---|---|
| 100°F | 275 psi | 720 psi | 1440 psi | 2160 psi |
| 500°F | 180 psi | 550 psi | 1100 psi | 1650 psi |
5. Manufacturing & Quality Control
Production Process
Forging: Closed-die hammer forging for grain structure
Machining: CNC precision to ±0.05mm tolerance
Heat Treatment: Solution annealing (ASTM A961)
Surface Finish: Pickled/passivated or electropolished
Testing
Dimensional Checks: Per ASME B16.5 Table 5/6
NDE: Liquid penetrant (PT), ultrasonic (UT)
Material Certs: EN 10204 3.1 with PMI verification
6. Industry Applications
Oil & Gas: Wellheads, pipeline connections
Chemical: Reactor flanges, acid piping
Power: Steam turbine connections
Water: Treatment plant piping
Why Choose Our ASME B16.5 Flanges?
✔ Full Compliance: ASME B16.5 & ASTM A182
✔ Certifications: PED, NACE, ISO 9001
✔ Global Stock: Fast delivery of standard sizes
✔ Engineering Support: Material selection, CAD models
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