Inconel 693
Supplied by Huaxiao-Alloy – Your Trusted Global Alloy Partner
1. Introduction to Inconel 693
Inconel 693 is a nickel chromium based superalloy specifically designed to deliver exceptional oxidation and carburization resistance at elevated temperatures. It is one of the most advanced alloys in the Inconel family, engineered to perform in aggressive high temperature industrial environments such as petrochemical furnaces, heat treating equipment, and gas turbine systems.
Unlike traditional Inconel grades, Inconel 693 contains a higher chromium content and controlled amounts of aluminum. This unique chemistry allows it to form a protective alumina (Al₂O₃) scale, which provides enhanced resistance to metal dusting and carburization — a problem that commonly affects alloys exposed to high temperature hydrocarbon environments.
At Huaxiao-Alloy, we supply Inconel 693 in sheets, plates, bars, pipes, forgings, and custom components. All our products are manufactured to strict international standards, ensuring consistent quality and long-term reliability.
2. Chemical Composition of Inconel 693
| Element | Typical wt.% | Role |
|---|---|---|
| Nickel (Ni) | Balance (≥58) | Corrosion resistance, toughness |
| Chromium (Cr) | 27–31 | High oxidation and carburization resistance |
| Iron (Fe) | ≤3 | Solid solution strengthening |
| Aluminum (Al) | 3.0–4.5 | Forms protective alumina scale |
| Titanium (Ti) | ≤0.5 | Stabilization |
| Cobalt (Co) | ≤2.5 | Strengthening |
| Carbon (C) | ≤0.08 | Carbide strengthening |
| Manganese (Mn) | ≤1 | Deoxidizer |
| Silicon (Si) | ≤0.5 | Improves oxidation resistance |
| Copper (Cu) | ≤0.5 | Corrosion resistance |
| Sulfur (S) | ≤0.015 | Controlled impurity |
The key differentiator of Inconel 693 is its chromium and aluminum content, which gives it a self-healing oxide scale that protects the base alloy during long service at temperatures up to 1150 °C.
3. Mechanical Properties of Inconel 693
| Property | Value |
|---|---|
| Density | 8.19 g/cm³ |
| Melting Range | 1345–1380 °C |
| Tensile Strength at Room Temp | ~690 MPa |
| Yield Strength at Room Temp | ~310 MPa |
| Elongation | 40 percent |
| Hardness | 150 HB |
| Oxidation Resistance | Excellent up to 1150 °C |
| Carburization Resistance | Outstanding in hydrocarbon environments |
These mechanical and thermal properties ensure durability, toughness, and dimensional stability even under severe cyclic heating conditions.
4. Key Features of Inconel 693
Outstanding oxidation resistance up to 1150 °C.
Excellent carburization resistance in hydrocarbon atmospheres.
Superior resistance to metal dusting compared with older Inconel alloys.
Good mechanical strength at both room and elevated temperatures.
Formability and weldability similar to other nickel alloys.
Long service life in aggressive chemical and thermal environments.
5. Heat Treatment
Inconel 693 is typically supplied in the annealed condition. Heat treatment at 1080 °C followed by rapid air or water quenching optimizes its balance of mechanical strength and corrosion resistance.
The alloy is not precipitation hardened like Inconel 718 or X-750; its performance depends on solid solution strengthening and stable oxide layer formation.
6. Applications of Inconel 693
6.1 Petrochemical Industry
Furnace tubes and burners
Steam cracking coils
Catalyst support grids
Components exposed to carburizing gases
6.2 Power Generation
Gas turbine combustors
Transition ducts and liners
Burner nozzles
6.3 Heat Treating Equipment
Industrial furnace parts
Fixtures and jigs
Retorts and muffles
6.4 Chemical Processing
Reactor vessels
Heat exchangers
Piping for corrosive and carburizing environments
6.5 Aerospace Industry
High temperature fasteners
Engine afterburner components
Exhaust ducting
7. Advantages of Inconel 693
Forms a continuous alumina scale that protects against oxidation and carburization.
Much higher metal dusting resistance compared with Inconel 601 and Inconel 625.
Long-term stability under cyclic heating and cooling.
Versatile fabrication and welding characteristics.
Cost-effective solution for equipment operating in extreme high temperature environments.
8. Limitations of Inconel 693
Lower mechanical strength compared with precipitation hardened alloys (718, X-750).
Limited toughness at cryogenic temperatures.
Cost is higher than standard stainless steels and heat-resistant alloys.
9. Comparison with Other Inconel Alloys
| Alloy | Max Temp Resistance | Carburization Resistance | Typical Applications |
|---|---|---|---|
| Inconel 601 | 1150 °C | Moderate | Furnace components, petrochemical |
| Inconel 625 | 980 °C | Moderate | Marine, chemical plants |
| Inconel 693 | 1150 °C | Excellent | Petrochemical furnaces, turbines |
| Inconel 718 | 700 °C | Moderate | Aerospace engines, fasteners |
| Inconel X-750 | 815 °C | Moderate | Nuclear, aerospace springs |
This table shows how Inconel 693 stands out when resistance to metal dusting and carburization is critical.
10. Forms Supplied by Huaxiao-Alloy
We provide Inconel 693 in a variety of product forms, tailored to your project requirements:
Sheets and Plates
Bars and Rods
Pipes and Tubes
Strips and Foils
Forgings and Rings
Wires and Mesh
Custom Machined Components
Each product is supplied with mill certificates, international standard compliance, and third-party inspection reports if required.
11. Processing and Fabrication
Forming: Good hot workability at 980–1200 °C. Cold forming requires higher loads.
Welding: Can be welded using GTAW, GMAW, or SMAW with Inconel filler metals. Post-weld annealing is recommended.
Machining: Similar to Inconel 625, requires rigid tools, slow speeds, and coolant.
Heat Treatment: Annealed condition is typical; rapid cooling is recommended to prevent sensitization.
12. Standards and Specifications
UNS Number: N06693
W. Nr.: 2.4642
Standards: ASTM B168 (Plate, Sheet, Strip), ASTM B166 (Rod, Bar, Wire), ASTM B167 (Pipe, Tube)
Forms: Sheet, plate, strip, rod, bar, wire, tube, pipe, forging
13. Why Choose Huaxiao-Alloy as Your Inconel 693 Supplier?
At Huaxiao-Alloy, we go beyond supplying materials — we deliver reliability, technical expertise, and customer-focused solutions.
Global supply chain with fast delivery
Competitive pricing backed by stable sourcing
Full traceability and certified quality
Custom processing and fabrication services
Technical support from experienced engineers
📩 Email: [email protected]
📱 WhatsApp: +1 (579) 300-2733
Its alumina-forming capability provides superior resistance to carburization and metal dusting.
Mainly petrochemical, power generation, and heat treating industries.
Yes, it is weldable using common nickel alloy procedures, though post-weld heat treatment is recommended.
It offers oxidation resistance up to 1150 °C, making it ideal for furnace and turbine components.
Yes, we manufacture tailor-made components according to customer drawings.
15. Conclusion
Inconel 693 is a next-generation nickel chromium superalloy designed to withstand the most aggressive oxidizing, carburizing, and metal dusting environments. Its performance in petrochemical, heat treating, and power generation applications sets it apart from conventional alloys.
Choosing Huaxiao-Alloy as your supplier ensures not only access to premium quality materials, but also the expertise and reliability you need to keep your operations running efficiently.
📩 Email: [email protected]
📱 WhatsApp: +1 (579) 300-2733
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