INCONEL alloy 740 Precipitation-Hardenable Ni-Cr-Co Superalloy,INCONEL alloy 740，1

### **Product Introduction: INCONEL® Alloy 740 Precipitation-Hardenable Ni-Cr-Co Superalloy** **INCONEL® Alloy 740** is a advanced precipitation-hardenable nickel-chromium-cobalt superalloy specifically developed for high-temperature applications requiring exceptional creep strength, corrosion resistance, and microstructural stability. This alloy represents a significant advancement in superalloy technology, offering superior performance in ultra-supercritical power generation systems and advanced aerospace applications where conventional materials reach their operational limits. The alloy's optimized composition enables it to maintain excellent mechanical properties at temperatures up to 800°C (1472°F), while providing outstanding resistance to oxidation, carburization, and other forms of high-temperature degradation. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 23.0 - 26.0 | | **Cobalt (Co)** | 18.0 - 22.0 | | **Molybdenum (Mo)** | 0.3 - 1.0 | | **Titanium (Ti)** | 1.2 - 1.8 | | **Aluminum (Al)** | 0.8 - 1.5 | | **Niobium (Nb)** | 1.2 - 2.2 | | **Iron (Fe)** | 0.7 max | | **Manganese (Mn)** | 0.3 max | | **Silicon (Si)** | 0.5 max | | **Carbon (C)** | 0.03 - 0.08 | | **Boron (B)** | 0.0005 - 0.005 | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.31 g/cm³ | | **Melting Point** | 1350 - 1390 °C | | **Thermal Conductivity** | 13.2 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.22 μΩ·m | | **Modulus of Elasticity** | 225 GPa | | **Coefficient of Thermal Expansion** | 13.8 μm/m·°C (20-800°C) | | **Specific Heat Capacity** | 455 J/kg·K | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties** **Solution Annealed Condition:** - **Tensile Strength:** 860 - 1030 MPa - **Yield Strength (0.2% Offset):** 480 - 620 MPa - **Elongation:** 35 - 45% - **Hardness:** 25 - 35 HRC **Aged Condition:** - **Tensile Strength:** 1240 - 1380 MPa - **Yield Strength (0.2% Offset):** 830 - 970 MPa - **Elongation:** 18 - 25% - **Hardness:** 35 - 42 HRC --- ### **Heat Treatment** **Standard Heat Treatment:** - **Solution Treatment:** 1150 - 1180°C for 1-2 hours, rapid cool - **Aging Treatment:** 790 - 810°C for 4-8 hours, air cool **Alternative Treatments:** - Two-step aging for optimized properties - Stress relief treatments for welded components --- ### **Key Characteristics & Advantages** 1. **Exceptional High-Temperature Strength** - Superior creep resistance up to 800°C - Excellent stress rupture properties - Outstanding thermal fatigue resistance 2. **Advanced Precipitation Hardening** - Gamma prime (γ') strengthening phase - Controlled precipitation kinetics - Stable microstructure during long-term exposure 3. **Superior Environmental Resistance** - Excellent oxidation resistance up to 1000°C - Good resistance to carburization and sulfidation - Stable protective oxide layer formation 4. **Excellent Fabricability** - Good weldability using conventional methods - Suitable for hot and cold working operations - Can be machined using appropriate techniques --- ### **Product Applications** **Power Generation:** - Ultra-supercritical boiler tubes - Steam turbine components - Heat exchanger tubes - Advanced power plant systems **Aerospace Industry:** - Gas turbine engine components - Combustion chamber parts - Turbine blades and disks - Exhaust system components **Industrial Applications:** - Chemical processing equipment - Heat treatment fixtures - High-temperature fasteners - Nuclear reactor components --- ### **International Standards** | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **ASME** | Code Case 2702 | Boiler and Pressure Vessel Code | | **ASTM** | B906 | General Requirements for Flat Products | | **ASTM** | B829 | General Requirements for Nickel Alloys | | **ISO** | 4956 | Superalloy Specifications | --- ### **Summary** **INCONEL® Alloy 740** represents a state-of-the-art precipitation-hardenable nickel-chromium-cobalt superalloy that delivers exceptional performance in the most demanding high-temperature applications. Its advanced composition and optimized heat treatment provide superior creep strength, excellent corrosion resistance, and outstanding microstructural stability at temperatures up to 800°C. The alloy's capability to maintain mechanical integrity under extreme conditions makes it particularly valuable for advanced power generation systems, aerospace components, and high-temperature industrial applications. Certification to major international standards including ASME Code Case 2702 and ASTM specifications ensures consistent quality and reliability, providing engineers with a proven material solution for next-generation high-temperature applications where conventional materials cannot meet performance requirements. The alloy's combination of exceptional high-temperature properties and fabricability establishes it as a key material for advancing technology in energy efficiency and high-temperature engineering.

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 3347 gallon liquid totes Special package is available on request.