Inconel 693 Fittings Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies inconel 693 fittings (N06693) from ready stock in Mumbai, to customers across India and in more than 40 export markets.
Fittings carry the same corrosion duty as the pipe they join but see higher stress concentration at every change of direction, so grade traceability and wall thickness at the extrados matter more here than anywhere else in a piping system.
Inconel 693 is formulated against metal dusting, the failure mode that eats ordinary nickel alloys in carbon-rich syngas at 400-800°C.
Sizes and Specifications
| Grade | Inconel 693 |
|---|---|
| UNS number | N06693 |
| Werkstoff (W.Nr.) | — |
| Specifications | ASTM B166, B167 and B168 as applicable |
| Size range | Butt-weld fittings 1/2" to 48" NB in Sch 5S to Sch XXS; forged socket-weld and threaded fittings 1/8" to 4" NB in 3000#, 6000# and 9000# classes. |
| Condition and finish | Elbows (45° and 90°, long and short radius), tees (equal and reducing), reducers (concentric and eccentric), caps, stub ends, couplings, unions, plugs and bushings. |
| 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 |
| Fittings specification | ASTM B366 |
Identifiers and physical constants for Inconel 693. A dash means no such designation is published for this grade.
Chemical Composition
Nickel balance with roughly 27-31% chromium and 2.5-4.0% aluminium, plus niobium. The aluminium addition is what suppresses metal dusting.
| 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
Combines the oxidation resistance of a high-chromium alloy with specific resistance to metal dusting - the catastrophic carburisation that destroys conventional alloys in syngas.
Industry Applications
Why this grade
Inconel 693 runs about 29% chromium with 3.1% aluminium, and has the best resistance to metal dusting of any conventional alloy in production. Metal dusting attacks steel in high-carbon atmospheres between 450 and 800°C, breaking the surface down into powder; if that is the failure mode in your reformer or cracker, 693 is the grade the problem calls for.
| Industry | Typical use |
|---|---|
| Petrochemical | Syngas coolers, reformer outlets and methanol plant. |
| Chemical processing | Direct-reduction iron plant and carburising atmospheres. |
| Power generation | Coal and biomass gasification equipment. |
| Heat treatment | Carbon-rich furnace atmospheres. |
| Oil and gas | Gas-processing hardware exposed to carbon activity above unity. |
Testing and Certification
Every consignment ships with an EN 10204 3.1 mill test certificate stating heat number, chemical analysis and mechanical properties. Depending on the specification we can add positive material identification, ultrasonic and dye-penetrant testing, intergranular corrosion testing to ASTM G28 or A262, hydrostatic testing, and third-party inspection release from Lloyd's Register, Bureau Veritas, SGS or TUV.
Aurico Alloys LLP operates an ISO 9001:2015 quality management system, and can certify material to NACE MR0175 / ISO 15156 for sour service where the grade permits.
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.