Inconel 693 Nickel Alloy Bar (UNS N06693)

Inconel 693 (UNS N06693; German Standard 2.4642) is a new-generation, high-chromium nickel-based alloy developed based on Inconel 690. Hailed as the "Corrosion Terminator" among nickel-based alloys, this material does not aim for extreme mechanical strength; rather, it pushes resistance to oxidation, sulfidation, metal dusting, and high-temperature carburization to the absolute limit.

Its typical applications include:

Petrochemical Industry: Reactor linings, thermocouple sheaths, and valve internals in synthesis gas (methanol, hydrogen, ammonia) production facilities.

Ethylene Cracking: Cracking furnace tubes and quench pipes, offering resistance to carburization corrosion.

Environmental/Energy Sector: Superheater tube banks in waste incinerators and internal components for biomass gasifiers.

Heat Treatment Industry: Furnace rollers, radiant tubes, trays, and baskets for carburizing furnaces.

Glass Manufacturing: Molten glass transfer piping and crucible components.

In summary: For any operating environment characterized by high temperatures combined with the presence of carbon, sulfur, or chlorine-where standard stainless steels or alloys 600 and 601 prove insufficient-Alloy 693 is a viable solution to consider.

(UNS N06693,Inconel 693)

(Inconel 693 Bar, ASTM B166, Annealed)

Inconel 693 is more difficult to machine than alloys 600 and 601, though it is somewhat more manageable than precipitation-hardened alloys such as 625 and 718. However, there are several key points that must be clarified in advance.

1. Melting Process - Purity is Essential
High-end applications typically require a dual-process combination of VIM (Vacuum Induction Melting) and ESR (Electroslag Remelting).

2. Hot Working - Narrow Temperature Window; Precise Control Required
During the hot working of Alloy 693, the temperature must be raised above 1050°C; working at lower temperatures significantly increases the risk of cracking. The 850–950°C range constitutes a "danger zone" that must be traversed as rapidly as possible.

3. Cold Working - Pronounced Work Hardening; Intermediate Annealing Required

4. Heat Treatment - Solution Treatment is a Critical Step
The performance of Alloy 693 is highly dependent on the solution treatment process. This is why our standard delivery condition is typically the solution-annealed state.

5. Welding - Mature Process; Filler Materials Must Be Matched

Alloy 693 exhibits good weldability; TIG (GTAW) or plasma arc welding is recommended. However, it is advisable to perform a solution treatment after welding. Failure to do so may compromise the metal dusting resistance of the weld zone.

6. Machining-Annealed State is Manageable; Aged State is Best Avoided
Based on our machining experience, the most reasonable processing route for Alloy 693 is as follows: Machine and shape the material in its annealed state → Perform final forming operations → Conduct solution treatment → Put directly into service. As a general rule, avoid performing any significant cutting operations after the solution treatment.

Providing you with an accurate and real-time quotation is contingent upon the truthful and effective exchange of the following technical parameters regarding Inconel 693 alloy bars-please take a look.

Dimensions: Typical diameters range from 20 to 500 mm; lengths are produced as required.

Condition: Solution Annealed (Standard Delivery Condition)

Surface Finish: Black (As-rolled), Turned, or Ground

Melting Process: Is a dual-melt process (VIM+ESR) required? This is typically mandated for high-end applications.

Special Testing: Is Ultrasonic Testing (UT) required? This is mandatory for critical pressure-bearing components.

Recommendations for Condition Selection:

For applications involving extensive machining or welding → Solution Annealed (Standard Condition)

For applications requiring high-temperature pressure resistance → Request the supplier to provide the material in the Solution Annealed state, and verify that the grain size meets or exceeds ASTM Grade 4.

Materials Supplied by Lork Group:

Material Test Certificate (MTC) [Including chemical composition, mechanical properties, and heat treatment records]

Melting Process Certification [Verification of VIM+ESR dual-melt process]

Non-Destructive Testing (NDT) Report [UT inspection, if applicable]

Third-Party Inspection Report [If required]

Email: susan@lorkgroup.com
Phone: +86 199 3707 5488

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