Forged ASME B16.5 1/2"-24" ASTM B381 Gr. F2 WN/SO/BL Flange
SSM is a trusted manufacturer and global supplier of forged ASME B16.5 flanges in ASTM B381 Grade F2, designed for high-performance industrial piping systems. Our flanges are suitable for welding neck (WN), slip-on (SO), and blind (BL) connections, ensuring reliable, leak-proof operation.
1. Product Overview
The ASTM B381 Gr. F2 forged flanges cover a wide range of pipe sizes from 1/2" to 24", suitable for chemical, petrochemical, power generation, and offshore applications.
They provide high strength, corrosion resistance, and long-term durability, essential for critical piping systems.
Standard: ASME B16.5 / ASTM B381
Size Range: 1/2" – 24" (DN15 – DN600)
Flange Types: Welding Neck (WN), Slip-On (SO), Blind (BL)
Material: ASTM B381 Gr. F2 (Nickel-Copper Alloy)
Pressure Rating: Class 150 – Class 2500
Applications: Chemical, petrochemical, marine, offshore, and industrial piping
2. Material Properties (ASTM B381 Gr. F2)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 62 min |
| Copper (Cu) | 33 min |
| Iron (Fe) | 3 max |
| Manganese (Mn) | 1 max |
| Carbon (C) | 0.10 max |
| Sulfur (S) | 0.03 max |
ASTM B381 F2 is a nickel-copper alloy offering:
Excellent resistance to seawater corrosion
Superior performance against oxidation and stress-corrosion cracking
Suitability for cryogenic and high-temperature environments
3. Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 690 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 200 HB |
| Service Temperature | -196°C to +200°C |
4. Key Features
✅ Wide Size Range: Covers 1/2" to 24" for multiple industrial applications
✅ Versatile Flange Types: WN, SO, and BL for flexible pipeline assembly
✅ High Corrosion Resistance: Ideal for marine, chemical, and offshore systems
✅ Durable and Reliable: Maintains integrity under high pressure and moderate temperature
✅ Standard Compliance: Meets ASME B16.5 and ASTM B381
5. Advantages and Limitations
Advantages:
Exceptional resistance to corrosion, oxidation, and seawater attack
Suitable for critical pipelines and pressure systems
Wide compatibility with nickel-copper piping and fittings
Limitations:
Higher material cost than carbon steel flanges
Requires proper handling and machining due to high strength alloy
6. Applications
Oil & Gas Offshore Pipelines
Chemical and Petrochemical Plants
Marine Equipment and Shipbuilding
Cryogenic Systems
Power Generation and Industrial Piping
7. Why Choose SSM
Over 30 years of experience in nickel-copper alloy flanges manufacturing
Certified ISO 9001 / EN 10204 3.1
Full compliance with ASME B16.5 and ASTM B381
Advanced forging, CNC machining, and NDT inspection
Global delivery and custom design services
8. Conclusion
The SSM Forged ASME B16.5 ASTM B381 Gr. F2 WN/SO/BL Flange combines durability, corrosion resistance, and precise engineering, making it ideal for offshore, chemical, and high-performance industrial pipelines.
It is the perfect solution for secure, reliable, and long-lasting pipeline connections.
📩 Contact SSM today for a quotation or custom specifications for your ASTM B381 Gr. F2 flange.
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