ASME B16.5 A182 F316 F316L F316H Flange
ASME B16.5 A182 F316 Flange is a type of flange made from 316 stainless steel that conforms to the ASME B16.5 standard. It offers excellent corrosion resistance, especially in environments with chloride ions and acidic media.
High Quality ASME B16.5 A182 F316 F316L F316H Flange
- Pressure Ratings Class 150/300/600/900/1500/2500
- Size Range NPS ½” to 24″ (ASME B16.5 standard)
ASME B16.5 ASME B16.5 A182 F316 F316L F316H Flange
The ASME B16.5 standard covers various flange designs, including:
- Weld Neck Flange: Preferred for high-pressure systems, connected via welding.
- Slip-On Flange: Easy installation, suitable for low-pressure applications.
- Blind Flange: Used to seal pipe ends.
- Threaded Flange: Connected via threads, eliminating the need for welding.
- Lap Joint Flange: Paired with stub ends for easy disassembly.
Dimensional Specifications (Per ASME B16.5 Standard)
| Parameter | Class 150 | Class 300 | Class 600 | Class 900+ |
| Flange OD | Refer to ASME B16.5 tables | Increases with pressure rating | Increases with pressure rating | Specific table lookup required |
| Bolt Hole Quantity | 4 (1/2″) to 48 (24″) | Increases with size | Same as left | Same as left |
| Bolt Hole Diameter | 0.62″ (1/2″) to 1.88″ | Increases with pressure rating | Same as left | Same as left |
| Flange Thickness | 0.56″ (1/2″) to 4.25″ | Increases with pressure rating | Same as left | Same as left |
Note: Exact dimensions vary by NPS and pressure class (refer to ASME B16.5 tables).
Material Properties (ASTM A182 F316）
Material Properties Comparison
| Parameter | F316 | F316L | F316H |
| Carbon Content (C) | ≤0.08% | ≤0.03% | 0.04–0.10% |
| Molybdenum (Mo) | 2.0–3.0% | 2.0–3.0% | 2.0–3.0% |
| Applicable Temp | -196°C to 450°C | -196°C to 450°C | -196°C to 800°C |
| Intergranular Corrosion Resistance | Moderate (requires post-weld solution treatment) | Excellent (no post-weld treatment required) | Moderate (requires post-weld solution treatment) |
| High-Temp Strength | Moderate | Low | Very High |
| Typical Applications | General corrosion-resistant piping | Welding-sensitive scenarios | High-temp steam/gas systems |
Mechanical Properties (Room Temperature)
| Property | F316 | F316L | F316H |
| Tensile Strength (MPa) | ≥515 | ≥485 | ≥515 |
| Yield Strength (MPa) | ≥205 | ≥170 | ≥205 |
| Elongation (%) | ≥40 | ≥40 | ≥40 |
Selection Suggestions
- Seawater/high-chloride environment (ambient temperature): F316L (for welding) or F316 (for non-welding).
- High-temp steam (above 500°C): F316H (with post-weld solution treatment).
- Extreme corrosive environments: Duplex steel (F51/F53) or nickel alloys (Inconel 625).
Usage Guidelines
Welding and Heat Treatment
- F316: Requires post-weld solution treatment (1050–1150°C rapid cooling) to avoid intergranular corrosion.
- F316L: Can be welded directly without post-weld treatment (low carbon prevents carbide precipitation).
- F316H: Requires post-weld solution treatment to restore high-temperature performance.
Corrosion Protection
Ideal Environments:
- Seawater, chloride-containing solutions (e.g., cooling water systems).
- Dilute sulfuric acid, phosphoric acid, and other mild acidic media.
Unsuitable Environments:
- Strong reducing acids (e.g., concentrated hydrochloric acid), high-temperature concentrated sulfuric acid.
- Alternatives: Duplex steel (F51/F53) or nickel alloys (Inconel 625).
Inspection Requirements
Mandatory Tests:
- Chemical composition (verify Mo content ≥2%).
- Pitting resistance test (ASTM G48, critical pitting temperature ≥25°C).
- Intergranular corrosion test (ASTM A262).
Typical Applications
F316:
- General high-corrosion environments (seawater, chemical media, mild acidic solutions).
- Pharmaceutical and food processing equipment (moderate temperature requirements).
F316L:
- Piping that cannot undergo post-weld solution treatment (e.g., offshore platform pipe joints).
- High chloride environments (e.g., coastal area equipment).
F316H:
- High-temperature, high-pressure steam pipes (boilers, heat exchangers, temperatures above 500°C).
- Petrochemical high-temperature reactors, cracking furnace components.
One-Stop ASME B16.5 A182 F316 Flange Provider for All Your Needs
SSM has significant product advantages in manufacturing ASME B16.5 A182 F316 Flange. Whether it’s quality or price, we will meet your needs.
More Information about ASME B16.5 A182 F316 Flange
ASME B16.5: A standard developed by the American Society of Mechanical Engineers (ASME) that specifies dimensions, pressure classes (Class 150–2500), and tolerance requirements for pipe flanges.
ASTM A182 F316/F316L/F316H:
All are molybdenum-enhanced austenitic stainless steels (16-18% chromium, 10-14% nickel, 2-3% molybdenum) suitable for highly corrosive environments, especially those containing chloride ions or acidic media.
- F316: Standard 316 stainless steel (carbon content ≤0.08%).
- F316L: Low-carbon version (carbon content ≤0.03%), offering better resistance to intergranular corrosion.
- F316H: High-carbon version (carbon content 0.04–0.10%), providing superior high-temperature strength.
Advantages and Disadvantages Analysis
| Material | Advantages | Disadvantages |
| F316 | Excellent chloride corrosion resistance, versatile | Requires post-weld solution treatment, relatively high cost |
| F316L | Superior intergranular corrosion resistance, ideal for welding scenarios | Low high-temperature strength (not recommended above 450°C) |
| F316H | High high-temperature strength (stable at 800°C) | High cost, requires strict post-weld treatment |
Comparison with Other Stainless Steel Flanges
| Characteristic | F316 Series | F304/F304L | F317L (High Moly) |
| Chloride Corrosion Resistance | Excellent (Molybdenum for pitting resistance) | Low (Prone to pitting) | Higher (Contains 4% Mo) |
| High-Temp Performance | F316H Excellent (≤800°C) | F304H Excellent (≤800°C) | Moderate (≤450°C) |
| Cost | High | Low | Highest |
FAQ
- No! F316L has significantly lower high-temperature strength than F316H; for temperatures above 450°C, F316H should be used.
- F316H: Enhanced high-temperature and corrosion resistance through higher carbon and molybdenum content.
- F321: Stabilized with titanium (Ti) for better intergranular corrosion resistance, but weaker chloride resistance compared to F316H.
- For ambient temperature seawater: F316L (for welded scenarios) or F316 (for non-welded scenarios).
- For high-temperature seawater (above 60°C): Switch to Duplex Steel (F51/F53) or Super Austenitic Stainless Steel (254SMO).
- Cutting: Requires carbide tools, low-speed machining.
- Cold Forming: Must control deformation to avoid cracking.
For detailed dimension tables, supplier quotes, or technical documentation, please provide:
- Service parameters: Medium type (e.g., chloride concentration, temperature/pressure).
- Certification requirements: ASME/EN/PED certifications, third-party inspection reports (e.g., TUV).
📞 Technical Support: Material selection consultation and quick quotes available!
Related Products
Forged Flanges
Forged Flanges Manufacturer Forged flanges are manufactured through hot forging or cold forging processes, where metal billets (such as stainless
DIN 2566 Flange
DIN 2566 refers to a German standard for threaded (screwed) flanges, designed for pipe connections without welding. Threaded flanges are
DIN 2527 Flange
DIN 2527 flange is a blind flange conforming to the German industrial standard DIN 2527. Its primary function is to
EN 
DE 
RU 
FA 
ID 
ES 
FR 
NL