Inconel 617

Key Features:

  1. Inconel 617 is resistant to carburization and spalling
  2. Elevated temperature high mechanical strength
  3. Excellent oxidation resistance
  4. Vey high metallurgical stability
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About Inconel 617

Inconel 617 is a nickel-chromium-cobalt-molybdenum superalloy known for its exceptional high-temperature strength, oxidation resistance, and corrosion resistance. It is widely used in extreme environments, such as gas turbines, nuclear reactors, and aerospace applications. It is available in the forms of Wire, Bar, Rod, Strip/Tape.

Industrial Nomenclatures: Inconel 617, Nicrofer 617, In617, UNS N06617

Inconel 617 Specifications: ASME SB-168, AMS 5888, AMS 5889, ASME SB-166, AMS 5887, ASME SB-564, AMS 5887

 Key Properties of Inconel 617:

– Composition (Typical):

  – Nickel (Ni): ~44-60% (base)

  – Chromium (Cr): ~20-24% (provides oxidation resistance)

  – Cobalt (Co): ~10-15% (enhances high-temperature strength)

  – Molybdenum (Mo): ~8-10% (improves creep resistance)

  – Aluminum (Al): ~0.8-1.5% (strengthens via precipitation hardening)

  – Iron (Fe): ≤ 3% (minor impurity)

  – Carbon (C): ≤ 0.15% (affects weldability and strength)

Outstanding Features:

  – High-Temperature Strength: Retains mechanical properties up to 1000°C (1832°F).

  – Oxidation & Corrosion Resistance: Excellent resistance to sulfidation, carburization, and chloride attack.

  – Creep & Rupture Strength: Performs well under prolonged stress at high temperatures.

  – Good Fabricability: Can be welded, machined, and formed, though it requires specialized techniques.

 Applications of Inconel 617:

  1. Aerospace: Combustion chambers, turbine blades, and afterburner components.
  2. Power Generation: Gas turbine components, heat exchangers, and nuclear reactor systems.
  3. Industrial Furnaces: High-temperature heating elements and radiant tubes.
  4. Chemical Processing: Equipment exposed to aggressive environments (e.g., petrochemical plants).

 Comparison with Other Superalloys:

Property Inconel 617 Inconel 625 Hastelloy X
Main Strengths High-temp strength, creep resistance Corrosion resistance, weldability Oxidation resistance, fabricability
Max Temp ~1000°C ~980°C ~1200°C
Key Elements Ni-Cr-Co-Mo Ni-Cr-Mo-Nb Ni-Cr-Fe-Mo

 Challenges:

– Machining & Welding: Requires low cutting speeds, high-power tools, and post-weld heat treatment to avoid cracking.

– Cost: Expensive due to high nickel and cobalt content.

 Conclusion:

Inconel 617 is a premium high-temperature alloy ideal for extreme environments where oxidation resistance and mechanical stability are critical. Its use is common in advanced aerospace, energy, and chemical industries.

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