ASTM B654 Inconel 625 Monel 400 Hastelloy C276 Alloy Steel Flange
ASTM B654 Inconel 625, Monel 400, Hastelloy C276 & Alloy Steel Flanges | SSM
SSM is a trusted global manufacturer and supplier of high-performance alloy flanges, including Inconel 625, Monel 400, Hastelloy C276, and Alloy Steel, manufactured according to ASTM B654 standards. These flanges are designed for critical piping systems in chemical, petrochemical, marine, and offshore applications.
1. Product Overview
Our ASTM B654 flanges are engineered for high temperature, high pressure, and corrosive environments, ensuring long-lasting, leak-proof connections. Available in Weld Neck (WN), Slip-On (SO), Blind (BL), and custom forged configurations, they are ideal for industrial pipelines and process equipment.
Standard: ASTM B654 / ASME B16.5 / Custom
Materials: Inconel 625, Monel 400, Hastelloy C276, Alloy Steel
Flange Types: WN, SO, BL, RF, RTJ, FF
Pressure Rating: Class 150 – 2500
Applications: Oil & gas, petrochemical, chemical processing, marine, and offshore pipelines
2. Material Properties
Inconel 625 (UNS N06625)
Nickel (Ni): 58 min
Chromium (Cr): 20–23
Molybdenum (Mo): 8–10
Excellent corrosion and high-temperature resistance
Monel 400 (N04400)
Nickel (Ni): 63 min
Copper (Cu): 28–34
Resistant to seawater and chemical corrosion
Hastelloy C276 (UNS N10276)
Nickel (Ni): 57 min
Molybdenum (Mo): 15–17
Exceptional resistance to oxidizing and reducing chemicals
Alloy Steel
Carbon, Chromium, Molybdenum composition tailored for high strength and durability under pressure and temperature
3. Mechanical Properties (Typical)
| Material | Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|---|
| Inconel 625 | ≥ 827 MPa | ≥ 414 MPa | ≥ 30% | 200–250 HB |
| Monel 400 | 690–850 MPa | 240–380 MPa | 30–45% | ≤ 250 HB |
| Hastelloy C276 | 485–655 MPa | 205–275 MPa | 35–40% | ≤ 217 HB |
| Alloy Steel | 485–620 MPa | 205–290 MPa | 20–25% | 200–235 HB |
4. Key Features
✅ High Corrosion Resistance: Suitable for marine, chemical, and acidic environments
✅ Versatile Flange Types: WN, SO, BL, RF, RTJ, FF
✅ Durable & Reliable: Withstands high pressure, temperature, and mechanical stress
✅ Customizable: Available in standard and customer-specific dimensions
✅ Standard Compliance: ASTM B654, ASME B16.5, and international standards
5. Advantages and Limitations
Advantages:
Excellent performance in oxidizing and reducing environments
Resistant to stress-corrosion cracking and intergranular attack
Long service life in petrochemical, marine, and chemical plants
Limitations:
Higher material cost than standard carbon steel
Requires specialized machining and handling due to high-strength alloys
6. Applications
Petrochemical and Chemical Processing Pipelines
Offshore Oil & Gas Platforms
Marine Equipment and Shipbuilding
Heat Exchangers & Pressure Vessels
Power Generation and Industrial Piping Systems
7. Why Choose SSM
30+ years of experience in high-performance alloy flange manufacturing
ISO 9001 and EN 10204 3.1 certified
Compliance with ASTM B654, ASME B16.5, and customer requirements
Advanced forging, CNC machining, and NDT inspection
Fast global delivery and custom design services available
8. Conclusion
The SSM ASTM B654 flanges in Inconel 625, Monel 400, Hastelloy C276, and Alloy Steel deliver superior corrosion resistance, strength, and durability, making them ideal for critical pipelines and industrial process systems.
Ensure secure, reliable, and long-lasting connections with SSM premium alloy flanges.
📩 Contact SSM today for quotations or custom design requests for your alloy steel flanges.
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