INCONEL alloy 693,UNS N06693; 1

### **Product Introduction: INCONEL® Alloy 693 (UNS N06693)** **INCONEL® Alloy 693** is a nickel-chromium-aluminum-iron alloy specifically engineered to provide exceptional resistance to high-temperature corrosion, including oxidation, carburization, sulfidation, and metal dusting. This advanced superalloy combines the excellent high-temperature strength characteristic of nickel-based alloys with superior environmental resistance, making it particularly suitable for demanding applications in thermal processing, chemical processing, and power generation industries. The alloy's optimized composition creates a highly stable, protective alumina (Al₂O₃) scale that provides outstanding protection in aggressive high-temperature environments where other materials might rapidly degrade. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 27.0 - 31.0 | | **Iron (Fe)** | 2.0 - 6.0 | | **Aluminum (Al)** | 2.5 - 4.0 | | **Niobium (Nb)** | 0.5 - 2.5 | | **Carbon (C)** | 0.15 max | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.50 max | | **Sulfur (S)** | 0.01 max | | **Copper (Cu)** | 0.50 max | | **Titanium (Ti)** | 0.50 max | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.05 g/cm³ | | **Melting Point** | 1345 - 1405 °C | | **Thermal Conductivity** | 12.5 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.18 μΩ·m | | **Modulus of Elasticity** | 215 GPa | | **Coefficient of Thermal Expansion** | 13.5 μm/m·°C (20-1000°C) | | **Specific Heat Capacity** | 460 J/kg·K | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties** **Annealed Condition:** - **Tensile Strength:** 690 - 860 MPa - **Yield Strength (0.2% Offset):** 310 - 480 MPa - **Elongation:** 35 - 45% - **Hardness:** 85 - 100 HRB **High-Temperature Performance:** - **Maximum Service Temperature:** 1200°C - **Excellent oxidation resistance up to 1200°C** - **Good creep strength at elevated temperatures** - **Superior thermal fatigue resistance** --- ### **Key Characteristics & Advantages** 1. **Exceptional High-Temperature Corrosion Resistance** - Outstanding resistance to oxidation and carburization - Excellent performance in sulfidizing environments - Superior resistance to metal dusting phenomena 2. **Enhanced Environmental Protection** - Stable alumina scale formation for long-term protection - Good resistance to chlorine-containing atmospheres - Excellent performance in waste incineration environments 3. **Good Mechanical Properties** - Adequate strength at elevated temperatures - Good thermal fatigue resistance - Excellent structural stability 4. **Excellent Fabricability** - Good weldability using conventional methods - Suitable for hot and cold working operations - Can be machined using standard techniques --- ### **Product Applications** **Thermal Processing Industry:** - Heat treatment furnace components - Radiant tubes and retorts - Annealing covers and baskets - Sintering trays and fixtures **Chemical Processing:** - Reformer tubes and components - Ethylene furnace parts - Catalyst support grids - High-temperature reactors **Power Generation:** - Boiler components - Heat recovery systems - Flue gas ducting - Waste incineration systems **Pollution Control:** - Scrubber components - Exhaust system parts - Environmental control equipment - Air pollution control devices --- ### **International Standards** | Standard Type | Standard Number | Product Form | |---------------|-----------------|--------------| | **UNS** | N06693 | Unified Numbering System | | **NACE** | RP0294 | Resistance to Metal Dusting | | **ASTM** | B166 | Rod, Bar, and Wire | | **ASTM** | B168 | Plate, Sheet, and Strip | | **ASTM** | B906 | General Requirements | | **ASTM** | B167 | Seamless Pipe and Tube | --- ### **Summary** **INCONEL® Alloy 693 (UNS N06693)** represents a significant advancement in high-temperature corrosion-resistant alloys, specifically designed to withstand the most severe industrial environments. Its unique composition, featuring optimized chromium and aluminum content, provides unparalleled protection against oxidation, carburization, sulfidation, and metal dusting at temperatures up to 1200°C. The alloy's ability to form a stable, self-healing alumina scale ensures long-term performance in aggressive atmospheres encountered in thermal processing, chemical production, and power generation applications. Comprehensive certification to major international standards including ASTM B166, B168, B167, and NACE RP0294 guarantees consistent quality and performance, providing engineers with a reliable material solution for applications where conventional materials fail due to severe high-temperature corrosion. The alloy's combination of excellent environmental resistance, good mechanical properties, and fabricability makes it an ideal choice for extending equipment service life and reducing maintenance costs in the most demanding high-temperature 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 3346 gallon liquid totes Special package is available on request.