INCONEL 690 Nickel Superalloy,，1

### **Product Introduction: INCONEL® 690 Nickel Superalloy** **INCONEL® 690** is a nickel-chromium alloy specifically designed for exceptional resistance to high-temperature corrosion and oxidation. With its high chromium content (typically 28-31%), this alloy exhibits superior performance in oxidizing environments and demonstrates excellent resistance to stress-corrosion cracking in various corrosive media. The alloy's optimized composition makes it particularly suitable for nuclear applications, chemical processing, and other demanding industrial environments. The alloy maintains good mechanical properties at elevated temperatures and shows outstanding metallurgical stability during long-term exposure to high temperatures, making it a reliable choice for critical applications where component failure is not an option. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 28.0 - 31.0 | | **Iron (Fe)** | 7.0 - 11.0 | | **Carbon (C)** | 0.05 max | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.50 max | | **Copper (Cu)** | 0.50 max | | **Aluminum (Al)** | 0.50 max | | **Titanium (Ti)** | 0.50 max | | **Sulfur (S)** | 0.015 max | | **Phosphorus (P)** | 0.025 max | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.19 g/cm³ | | **Melting Point** | 1343-1377 °C | | **Thermal Conductivity** | 12.0 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.19 μΩ·m | | **Modulus of Elasticity** | 214 GPa | | **Coefficient of Thermal Expansion** | 13.9 μm/m·°C (20-300°C) | | **Specific Heat Capacity** | 450 J/kg·K | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties** **Room Temperature Properties (Annealed):** - **Tensile Strength:** 620-760 MPa - **Yield Strength (0.2% Offset):** 250-350 MPa - **Elongation:** 40-50% - **Hardness:** 85-95 HRB **Elevated Temperature Performance:** - **Maximum Service Temperature:** 1100°C - **Good creep strength up to 650°C** - **Excellent thermal stability** - **Maintains oxidation resistance at high temperatures** --- ### **Key Characteristics & Advantages** 1. **Exceptional Corrosion Resistance** - Outstanding resistance to oxidizing environments - Excellent performance in nitric acid and other oxidizing acids - Superior resistance to stress-corrosion cracking 2. **High-Temperature Capability** - Excellent oxidation resistance up to 1100°C - Good mechanical properties at elevated temperatures - Stable microstructure during long-term exposure 3. **Nuclear Applications Suitability** - Low corrosion rate in high-temperature water - Minimal susceptibility to stress-corrosion cracking - Excellent performance in nuclear reactor environments 4. **Good Fabricability** - Can be welded using conventional methods - Suitable for hot and cold working - Good machinability in annealed condition --- ### **Product Applications** **Nuclear Industry:** - Steam generator tubing in pressurized water reactors - Reactor vessel internals - Nuclear waste processing equipment - Fuel element components **Chemical Processing:** - Nitric acid production equipment - Chemical reactors and vessels - Heat exchangers in corrosive service - Piping systems for aggressive chemicals **Thermal Processing:** - Furnace components - Heat treatment equipment - Radiant tubes - High-temperature fixtures **Other Applications:** - Pollution control equipment - Acid production facilities - Pharmaceutical processing equipment - Aerospace components --- ### **International Standards** | Standard Type | Standard Number | Product Form | |---------------|-----------------|--------------| | **UNS** | N06690 | Unified Numbering System | | **ASTM** | B166 | Rod, Bar, and Wire | | **ASTM** | B168 | Plate, Sheet, and Strip | | **ASTM** | B167 | Seamless Pipe and Tube | | **ASME** | SB-166, SB-168 | Code Cases | | **DIN** | 2.4642 | Material Number | | **RCC-M** | M4101 | Nuclear Component Standard | --- ### **Summary** **INCONEL® 690** is a premium nickel-chromium superalloy that delivers exceptional performance in corrosive and high-temperature environments, particularly in nuclear applications. Its high chromium content provides superior resistance to oxidizing media and stress-corrosion cracking, while maintaining excellent mechanical properties and metallurgical stability. The alloy's proven reliability in nuclear steam generators and chemical processing equipment has established it as a material of choice for critical applications where safety and long-term performance are paramount. Compliance with major international standards including ASTM, ASME, and nuclear-specific specifications ensures consistent quality and reliability, providing engineers with a trusted material solution for the most demanding industrial and nuclear applications.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3333 gallon liquid totes Special package is available on request.