Nickelvac 690 UNS N06690 Nickel Superalloy,ASTM B 163, B 166, B 167, B 168.,E FORU

### **Product Introduction: Nickelvac® 690 (UNS N06690) Nickel-Chromium-Iron Superalloy** **Nickelvac 690 (UNS N06690)** is a nickel-chromium-iron alloy specifically engineered for exceptional resistance to stress corrosion cracking and high-temperature corrosion. With its high chromium content (typically 28-31%), this solid-solution strengthened superalloy demonstrates outstanding performance in corrosive environments, particularly in caustic solutions, acidic media, and high-temperature water. The alloy's excellent thermal stability and mechanical properties make it particularly valuable for nuclear, chemical processing, and power generation applications. The alloy's superior performance stems from its optimized chemical composition, which provides exceptional resistance to intergranular attack and stress corrosion cracking while maintaining good mechanical properties from cryogenic temperatures up to 540°C (1000°F). --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of Nickelvac 690 per ASTM standards is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | ≥ 58.0 | **Aluminum (Al)** | 0.50 max | | **Chromium (Cr)** | 28.0 - 31.0 | **Titanium (Ti)** | 0.50 max | | **Iron (Fe)** | 7.0 - 11.0 | **Copper (Cu)** | 0.50 max | | **Carbon (C)** | 0.05 max | **Silicon (Si)** | 0.50 max | | **Manganese (Mn)** | 0.50 max | **Sulfur (S)** | 0.015 max | | **Cobalt (Co)** | 0.10 max | **Phosphorus (P)** | 0.025 max | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.19 g/cm³ | 0.296 lb/in³ | | **Melting Range** | 1343 - 1377 °C | 2450 - 2510 °F | | **Thermal Conductivity** | 14.0 W/m·K | 97.1 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 14.2 μm/m·°C | 7.9 μin/in·°F | | **Modulus of Elasticity** | 211 GPa | 30.6 x 10⁶ psi | | **Specific Heat** | 450 J/kg·K | 0.107 Btu/lb·°F | **Mechanical Properties (Typical Annealed Condition):** | Property | Value | |----------|-----------------| | **Tensile Strength** | 620-760 MPa | 90-110 ksi | | **Yield Strength (0.2% Offset)** | 250-350 MPa | 36-51 ksi | | **Elongation** | 45-50% | | **Hardness (Rockwell B)** | 85-95 HRB | **Elevated Temperature Properties (at 538°C/1000°F):** | **Tensile Strength** | 520 MPa | 75 ksi | | **Yield Strength** | 170 MPa | 25 ksi | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Exceptional Stress Corrosion Cracking Resistance**: Outstanding performance in chloride and caustic environments - **High Temperature Water Corrosion Resistance**: Excellent resistance in high-purity water up to 400°C - **Intergranular Corrosion Resistance**: Superior performance due to low carbon content and thermal stability - **Oxidation Resistance**: Excellent resistance to oxidizing atmospheres up to 1100°C - **Good Mechanical Properties**: Maintains strength and ductility across wide temperature range - **Excellent Fabricability**: Good weldability and formability using standard techniques **Product Applications:** Nickelvac 690 serves critical functions in demanding environments: - **Nuclear Power Industry**: - Steam generator tubing in pressurized water reactors - Reactor vessel internals and core support structures - Nuclear waste processing equipment - Control rod drive mechanisms - **Chemical Processing**: - Caustic evaporation and concentration systems - Sulfuric acid production equipment - Nitric acid coolers and condensers - Chemical reaction vessels - **Thermal Processing**: - Heat treatment furnace components - Radiant tubes and furnace muffles - Annealing covers and retorts - High-temperature thermowells - **Pollution Control**: - Flue gas desulfurization systems - Waste incineration equipment - Scrubber systems and ductwork - Environmental control systems - **Power Generation**: - Feedwater heater tubing - Steam condenser components - Boiler tubing and supports - Heat recovery steam generators --- #### **4. International Standards & Specifications** Nickelvac 690 is comprehensively covered by international standards: **ASTM Standards:** - **ASTM B163**: Seamless Condenser and Heat-Exchanger Tubes - **ASTM B166**: Rod, Bar, and Wire - **ASTM B167**: Seamless Pipe and Tube - **ASTM B168**: Plate, Sheet, and Strip **Other International Standards:** - **UNS**: N06690 - **ASME**: SB-163, SB-166, SB-167, SB-168 - **EN**: 2.4642 (NiCr29Fe) - **DIN**: 2.4642 - **ISO**: 6207 (NW 6690) - **JIS**: NW 6690 - **RCC-M**: Nuclear Code Compliance --- #### **Summary of Key Advantages** - **Superior Corrosion Resistance**: Exceptional performance in stress corrosion cracking and intergranular corrosion - **Nuclear Grade Quality**: Meets stringent nuclear industry requirements for steam generator applications - **High Temperature Capability**: Maintains properties in temperatures up to 540°C (1000°F) - **Proven Reliability**: Extensive successful service history in nuclear and chemical applications - **Excellent Fabricability**: Good weldability and formability for complex component manufacturing - **Comprehensive Standardization**: Covered by complete suite of international specifications **Technical Note**: Nickelvac 690 exhibits excellent weldability using GTAW, GMAW, and SMAW processes with matching filler metals. The low carbon content minimizes sensitization during welding, making it suitable for as-welded construction in most applications. The alloy demonstrates good hot workability in the temperature range of 870-1230°C (1600-2250°F). For optimum corrosion resistance, a final thermal treatment at 899-982°C (1650-1800°F) followed by rapid cooling is recommended. The material's exceptional corrosion resistance is attributed to the formation of a continuous, protective chromium oxide film that provides long-term protection in aggressive environments.

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 3155 gallon liquid totes Special package is available on request.