Inconel 693 Pipes Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies Inconel 693 pipe (UNS N06693) to ASTM B167 from Mumbai, to customers across India and in more than 40 export markets.
A 693 pipe line carries synthesis gas – the hydrogen and carbon monoxide stream that feeds ammonia, methanol and hydrogen production. In the temperature band where that gas cools, its carbon activity attacks the pipe wall by metal dusting, and 693 was developed by Special Metals to resist it; the alloy has been used successfully in a reactor for syngas production.
Sizes and Specifications
| Grade | Inconel 693 |
|---|---|
| UNS number | N06693 |
| Werkstoff (W.Nr.) | — |
| Specifications | ASTM B167 (seamless pipe and tube) |
| Size range | Nominal bore 1/8" to 30" in Sch 5S through Sch XXS, seamless and welded (ERW / EFW), single random, double random and cut lengths. |
| Condition and finish | Annealed and pickled, bright annealed or polished, with plain, bevelled or threaded ends. |
| 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. The schedule of a syngas line is set by pressure; what 693 adds is a chromium and aluminium scale that resists metal dusting and carburisation where the line would otherwise waste away locally.
Industry Applications
Why Inconel 693 pipe
The expensive thing about metal dusting is that it is local: a line looks sound until it pits through at the section that sat in the wrong temperature band. Replacing that section with more of the same alloy repeats the failure. 693 changes the material at the root of the problem. Where the syngas runs above or below the dusting range, a more conventional alloy is the better value.
| Industry | Typical use |
|---|---|
| Petrochemical | Synthesis-gas transfer lines in ammonia, methanol and hydrogen plant. |
| Chemical processing | Reactor connections in syngas production. |
| Energy | Gas lines in high-temperature fuel cell designs producing synthesis gas. |
| Industrial | Process piping in carburising, carbon-rich gas. |
Testing and Certification
Pipe is supplied with an EN 10204 3.1 mill test certificate stating heat number, chemical analysis and mechanical properties. Hydrostatic testing, ultrasonic examination and positive material identification are available on request, with third-party inspection 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.