Inconel 693 Tube Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies Inconel 693 tube (UNS N06693) to ASTM B167 from Mumbai, to customers across India and in more than 40 export markets.
Tube is the form 693 is most often bought in. Special Metals lists its typical products as reformer tubes, thermowells, thermocouple sheathing and tube ferrules – all parts that sit in hot synthesis gas for ammonia, methanol and hydrogen production, where carbon-rich gas breaks ordinary alloys down to powder by metal dusting. 693’s 27–31% chromium with 2.5–4.0% aluminium is formulated against exactly that.
Sizes and Specifications
| Grade | Inconel 693 |
|---|---|
| UNS number | N06693 |
| Werkstoff (W.Nr.) | — |
| Specifications | ASTM B167 (seamless pipe and tube) |
| Size range | Outside diameter 3.0 mm to 254 mm with wall thickness 0.5 mm to 15 mm, in seamless and welded construction, random or cut lengths up to 6 m and longer to order. |
| Condition and finish | Supplied annealed and pickled, bright annealed or polished, in straight lengths, U-bends and coiled tubing for instrumentation. |
| Certification | EN 10204 3.1 mill test certificate; 3.2 and third-party inspection on request |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | N06693 |
| Density | 7.77 g/cm3 |
| Melting range | 1317-1367 °C |
| Electrical resistivity | 1.168 µΩ·m |
| Pipe and tube specification | ASTM B167 |
Identifiers and physical constants for Inconel 693. A dash means no such designation is published for this grade.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | — | Balance (determined arithmetically by difference) |
| Chromium (Cr) | 27.0 | 31.0 |
| Iron (Fe) | 2.5 | 6.0 |
| Aluminium (Al) | 2.5 | 4.0 |
| Niobium (Nb) | 0.5 | 2.5 |
| Manganese (Mn) | — | 1.0 |
| Titanium (Ti) | — | 1.0 |
| Copper (Cu) | — | 0.5 |
| Silicon (Si) | — | 0.5 |
| Carbon (C) | — | 0.15 |
| Sulfur (S) | — | 0.01 |
Composition limits for Inconel 693. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical and Physical Properties
Special Metals reports excellent rupture strength for 693 at elevated temperature, but tube in this grade is chosen for its surface: the chromium and aluminium build a protective scale that resists metal dusting and carburisation where a stronger alloy would simply be eaten.
Industry Applications
Why Inconel 693 tube
Metal dusting does not thin a tube evenly; it pits and wastes it locally until it perforates, and it does so in alloys that are otherwise excellent at temperature. Special Metals describes 693 as having the best resistance to metal dusting in chemical and petrochemical environments of any conventional alloy in production. If your reformer, waste-heat boiler or thermowell is failing by that mechanism, 693 tube is the alloy the problem calls for; if it is not, a cheaper high-temperature alloy will do.
| Industry | Typical use |
|---|---|
| Petrochemical | Reformer tubes and tube ferrules in synthesis-gas plant for ammonia, methanol and hydrogen. |
| Instrumentation | Thermowells and thermocouple sheathing in carbon-rich, metal-dusting gas. |
| Energy | Tube for high-temperature fuel cell designs where synthesis gas is produced. |
| Chemical processing | Heat-exchanger tube in carburising process gas. |
Testing and Certification
Tube ships with an EN 10204 3.1 mill test certificate stating heat number, chemical analysis and mechanical properties. Hydrostatic and ultrasonic testing and positive material identification to confirm the aluminium-bearing grade are available on request, with third-party release under our ISO 9001:2015 system.
Frequently Asked Questions
Request a Quotation
Send your size, quantity and specification and we will come back with price and lead time, usually the same working day. Call +91 7977 88 6611 or email info@auricoalloys.com.