Inconel 617 螺母 UNS N06617/NiCr22Co12Mo9 / NS3106/ 2.4663/ B166

Inconel 617 (UNS N06617 / W.Nr. 2.4663) nuts are high-performance fasteners manufactured from nickel-based solid-solution-strengthened alloys. With excellent high-temperature resistance, oxidation resistance, corrosion resistance, and high strength, they serve as critical connectors in extreme environments. Below is the core information:

Parameters:

• Category: Hexagon Nut
• Product Grade: Class A
• Strength Grade: Grade 8
• Across Flats Width: 8-120
• Height: 5.6-60 (mm)
• Thread Specification: M5-M100
• Surface Treatment: Untreated

1. Material Characteristics

• Chemical Composition (Typical Values):
  • Nickel (Ni) ≥ 44.5%, Chromium (Cr) 20-24%, Cobalt (Co) 10-15%, Molybdenum (Mo) 8-10%, Aluminum (Al) 0.8-1.5%, Iron (Fe) ≤ 3.0%, Carbon (C) 0.05-0.15%.
• Strengthening Mechanism: Solid-solution strengthening. The formation of a complex oxide film through high nickel, chromium, cobalt, and molybdenum content enhances high-temperature and corrosion resistance.
• High-Temperature Performance: Operating temperature can reach 1100°C, with short-term tolerance up to 1150°C. It maintains high strength and creep resistance at elevated temperatures.

2. Core Advantages

1. High-Temperature Resistance
   • Maintains high tensile strength (≥ 769 MPa) and fatigue resistance above 700°C, suitable for long-term high-temperature load-bearing.
2. Corrosion Resistance
   • Resistant to oxidizing acids (nitric acid, sulfuric acid), chlorides, seawater, and sulfur-containing environments. Particularly resistant to sulfide corrosion, making it suitable for coal-fired power plants and chemical equipment.
3. Machinability and Weldability
   • Can be formed via hot forging and hot rolling. TIG or MIG welding is recommended using ENiCrMo-3 filler wire, with no post-weld heat treatment required.

3. Application Areas

• Aerospace: Turbine engine combustion chamber bolts, combustion tank fasteners.
• Energy Industry: Gas turbine transition piece bolts, high-temperature heat exchanger bolts for nuclear high-temperature gas-cooled reactors.
• Chemical & Petrochemical: Nitric acid production catalyst support bolts, high-temperature reactor flange bolts.
• Heat Treatment: High-temperature furnace muffle tank and radiant tube connection bolts.
• Nuclear Industry: High-temperature components for nuclear reactors (e.g., helium/helium medium heat exchanger bolts).

4. Standards and Certifications

• International Standards:
  • ASTM B166 (Bar), ASTM F467 (Bolts), ISO 4014 (Hexagon Bolts), DIN 931 (DIN Standard Bolts).
• Certifications:
  • PED Certification (Pressure Equipment Directive), EN 10204 3.1/3.2 Material Certificates, complies with NACE MR0175 standard for sulfide stress cracking resistance.

5. Manufacturing Process

• Raw Materials: Produced via Vacuum Induction Melting (VIM) + Electroslag Remelting (ESR) to ensure high purity and uniformity.
• Forming Methods:
  • Hot Forging: Heated to 1050-1150°C to avoid grain coarsening.
  • Cold Working: Solution treatment (1150-1200°C) is required after cold drawing or rolling to restore plasticity.
• Surface Treatment: Options include nickel plating and PTFE coating to enhance corrosion resistance and anti-galling properties.

6. Typical Mechanical Properties (Room Temperature)

7. Global Grade Equivalents

8. Precautions

• Hot Working Control: Avoid dwelling in the sensitive temperature range of 900-1000°C to prevent grain coarsening.
• Environmental Adaptability: Avoid contact with molten metals (e.g., lead, zinc) to prevent hot brittleness.
• Installation Torque: Pre-tightening force must be precisely controlled to avoid stress concentration leading to cracking.

Summary