What is Inconel 617? Chemical Composition & Full Properties

（Inconel 617 UNS N06617 is a premium nickel-chromium-cobalt alloy. Explore its chemical composition, mechanical properties, heat resistance and working temperature range.）

Inconel 617 (UNS N06617 / W.Nr. 2.4663) is a solid-solution strengthened nickel-chromium-cobalt-molybdenum superalloy. It is specifically engineered to deliver an exceptional combination of high-temperature strength, outstanding oxidation resistance (up to 1100°C~1200°C), and resistance to carburization and nitridation. Shanghai COCESS Special Alloys Co., Ltd​ supplies this critical alloy, ensuring your high-heat projects benefit from its proven metallurgical stability and full property data transparency.

Precise Chemical Composition (Mass Fraction %)

The performance of Inconel 617 is defined by its balanced chemistry, where Cobalt and Molybdenum provide solid-solution strengthening, while Chromium and Aluminum ensure extreme oxidation resistance.

• Nickel (Ni):​ Balance (≥ 44.5%)

• Chromium (Cr):​ 20.0 – 24.0

• Cobalt (Co):​ 10.0 – 15.0 (Key for high-temp strength)

• Molybdenum (Mo):​ 8.0 – 10.0 (Solid-solution strengthening)

• Aluminum (Al):​ 0.8 – 1.5 (Enhances oxide scale adhesion)

• Iron (Fe):​ ≤ 3.0

• Carbon (C):​ 0.05 – 0.15 (Forms carbides for grain boundary strength)

• Titanium (Ti):​ ≤ 0.6

• Manganese (Mn):​ ≤ 1.0

• Silicon (Si):​ ≤ 1.0 (Typically controlled lower, ~0.5 max for quality)

• Sulfur (S):​ ≤ 0.015

• Boron (B):​ ≤ 0.006 (Trace addition for grain boundary cohesion)

Physical & Mechanical Properties (Solution Annealed)

Inconel 617 retains significant mechanical integrity at temperatures where most alloys fail, making it ideal for load-bearing high-heat applications.

• Physical Properties:

  • Density: 8.36 g/cm³ (0.302 lb/in³)

  • Melting Range: 1330 – 1380°C (2426 – 2516°F)

  • Thermal Conductivity (100°C): ~13.4 W/(m·K)

  • Modulus of Elasticity (20°C): ~211 – 212 GPa

• Room Temperature Mechanical (Typical Min/Average):

  • Tensile Strength (Rm): ≥ 690 MPa (Typical 730~780+ MPa)

  • Yield Strength (Rp0.2): ≥ 240~280 MPa (Typical 310~350 MPa)

  • Elongation (A): ≥ 30~35% (Typical 40~45%)

  • Hardness: Typically ≤ 95~100 HRB (Annealed soft state)

• High-Temperature Retention:

  • At 600°C: Tensile Strength approx. 510~540 MPa.

  • At 800°C~1000°C: Retains 300~450 MPa tensile strength.

  • Creep Rupture: Exhibits strong performance (e.g., ~10-15 MPa stress rupture strength at 1090°C for 1000h), suitable for long-term high-heat stress environments.

Applicable Standards & Product Forms

To ensure global compatibility, Inconel 617 is supplied by Shanghai COCESS Special Alloys Co., Ltd​ in compliance with major international standards:

• Bar, Rod, Wire:​ ASTM B166 / ASME SB-166, AMS 5887

• Plate, Sheet, Strip:​ ASTM B168 / ASME SB-168, AMS 5888, AMS 5889

• Seamless Pipe & Tube:​ ASTM B167 / ASME SB-167, B829

• Welded Tube/Pipe:​ ASTM B546 / ASME SB-546, B619

• Forgings:​ ASTM B564 / ASME SB-564, AMS 5887

• European/Industrial:​ DIN 17742/17750/17752 (W.Nr. 2.4663), VdTÜV 485.

Core Characteristics & Application Logic

Unlike precipitation-hardened alloys, 617 is solid-solution strengthened, meaning it offers excellent thermal stability with less risk of over-aging or embrittlement during long exposures at 900°C~1100°C.

• Key Advantages:​ Superior resistance to cyclic oxidation (forms tenacious Cr₂O₃/Al₂O₃ scale), excellent carburization resistance, and high creep-rupture strength.

• Typical Uses:​ Gas turbine combustion cans, transition liners, ducting; Industrial furnace muffles, radiant tubes, heat treatment fixtures; Petrochemical pyrolysis furnace components; Advanced high-temperature gas-cooled nuclear reactor (HTGR) heat exchangers.

For detailed Mill Test Certificates (MTC) or to inquire about Inconel 617 plates, bars, and tubes with verified chemical and mechanical properties, contact Shanghai COCESS Special Alloys Co., Ltd.

Website: https://en.cocessalloys.com
Email: sales@cocessalloys.com