INCONEL MA758 Oxide-Dispersion-Strengthened Ni-Cr Superalloy，1

### **Product Introduction: INCONEL® MA758 Oxide-Dispersion-Strengthened Ni-Cr Superalloy** **INCONEL® MA758** is an advanced **oxide-dispersion-strengthened (ODS)** nickel-chromium superalloy produced through mechanical alloying (MA) technology. This unique manufacturing process creates a fine, uniform dispersion of yttrium oxide (Y₂O₃) particles throughout the nickel-chromium matrix, resulting in exceptional high-temperature strength, outstanding oxidation resistance, and superior creep resistance at temperatures up to 1300°C (2372°F). The alloy is specifically engineered for applications requiring long-term stability and mechanical integrity in extreme temperature environments where conventional superalloys would rapidly degrade. Its unique microstructure provides remarkable resistance to creep deformation and maintains excellent surface stability under oxidizing conditions. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 28.0 - 32.0 | | **Yttrium Oxide (Y₂O₃)** | 0.45 - 0.75 | | **Iron (Fe)** | 1.0 max | | **Aluminum (Al)** | 0.3 max | | **Titanium (Ti)** | 0.3 max | | **Carbon (C)** | 0.05 max | | **Silicon (Si)** | 0.5 max | | **Manganese (Mn)** | 0.5 max | | **Tungsten (W)** | 0.5 max | | **Molybdenum (Mo)** | 0.5 max | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.05 g/cm³ | | **Melting Point** | 1380 - 1420 °C | | **Thermal Conductivity** | 15.2 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.25 μΩ·m | | **Modulus of Elasticity** | 220 GPa | | **Coefficient of Thermal Expansion** | 14.5 μm/m·°C (20-1000°C) | | **Specific Heat Capacity** | 480 J/kg·K | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties** **Room Temperature Properties:** - **Tensile Strength:** 860 - 1000 MPa - **Yield Strength (0.2% Offset):** 620 - 750 MPa - **Elongation:** 15 - 25% - **Hardness:** 25 - 35 HRC **High-Temperature Performance:** - **Creep Rupture Strength (1100°C/100h):** 50 MPa - **Stress Rupture Life (1200°C/20 MPa):** >500 hours - **Excellent thermal fatigue resistance** - **Superior microstructural stability** --- ### **Key Characteristics & Advantages** 1. **Exceptional High-Temperature Strength** - Superior creep resistance up to 1300°C - Excellent stress rupture properties - Outstanding thermal fatigue resistance 2. **Oxide Dispersion Strengthening Technology** - Fine, stable yttrium oxide dispersoids - Inhibition of dislocation motion and grain boundary sliding - Enhanced microstructural stability 3. **Outstanding Oxidation Resistance** - Excellent resistance to scaling and oxidation - Stable protective chromium oxide layer formation - Good resistance to carburizing environments 4. **Controlled Microstructure** - Coarse, elongated grain structure - Optimized for high-temperature creep resistance - Resistant to recrystallization and grain growth --- ### **Product Applications** **Thermal Processing Industry:** - Radiant furnace tubes - Heat treatment fixtures and baskets - Sintering trays and boats - High-temperature furnace components **Aerospace Industry:** - Combustion chamber components - Afterburner parts - Turbine seal supports - Rocket engine components **Nuclear Industry:** - Core component supports - Fuel element cladding - Reactor internals - Nuclear process equipment **Industrial Applications:** - Glass manufacturing equipment - Ceramic processing components - Heat exchanger parts - High-temperature fasteners --- ### **International Standards** | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **AMS** | 5892 | Bar and Wire Specification | | **ASTM** | B849 | General Requirements | | **ASME** | Code Case N-201 | Nuclear Components | | **ISO** | 4956 | Superalloy Specifications | --- ### **Summary** **INCONEL® MA758** represents the pinnacle of oxide-dispersion-strengthened superalloy technology, offering unparalleled high-temperature performance and microstructural stability. The unique mechanical alloying manufacturing process creates a material capable of withstanding extreme temperatures and aggressive environments that would rapidly degrade conventional superalloys. Its exceptional creep resistance, outstanding oxidation resistance, and superior thermal stability make it an ideal choice for the most demanding applications in thermal processing, aerospace, nuclear, and industrial sectors. While the alloy presents manufacturing challenges, particularly in welding, its performance advantages in extreme temperature applications make it an indispensable material for advanced engineering applications where reliability and long-term performance at temperatures up to 1300°C are critical requirements.

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 3337 gallon liquid totes Special package is available on request.