Inconel 686 Fittings Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies inconel 686 fittings (N06686, Werkstoff 2.4606) 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 686 carries more molybdenum plus tungsten than C-276, which is what buys the extra margin in hot, contaminated chloride service.
Sizes and Specifications
| Grade | Inconel 686 |
|---|---|
| UNS number | N06686 |
| Werkstoff (W.Nr.) | 2.4606 |
| Specifications | ASTM B575 (sheet and plate), B622 (tube), B574 (rod, bar and wire) |
| 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 | N06686 |
| Werkstoff / EN number | 2.4606 |
| Density | 8.73 g/cm3 |
| Melting range | 1338-1380 °C |
| Electrical resistivity | 1.237 µΩ·m |
| Magnetic permeability (at 200 oersted / 15.9 kA/m) | 1.0001 |
| Fittings specification | ASTM B366 |
Identifiers and physical constants for Inconel 686. A dash means no such designation is published for this grade.
Chemical Composition
Nickel balance with 19-23% chromium, 15-17% molybdenum and 3.0-4.4% tungsten. The combined molybdenum and tungsten give one of the highest pitting resistance equivalent numbers available in a wrought nickel alloy.
| Element | Min (%) | Max (%) |
|---|---|---|
| Chromium (Cr) | 19.0 | 23.0 |
| Molybdenum (Mo) | 15.0 | 17.0 |
| Tungsten (W) | 3.0 | 4.4 |
| Titanium (Ti) | 0.02 | 0.25 |
| Iron (Fe) | — | 2.0 |
| Carbon (C) | — | 0.01 |
| Manganese (Mn) | — | 0.75 |
| Sulfur (S) | — | 0.02 |
| Silicon (Si) | — | 0.08 |
| Phosphorus (P) | — | 0.04 |
| Nickel (Ni) | — | Balance |
Composition limits for Inconel 686. 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
Annealed tensile strength around 720 MPa. Resists both oxidising and reducing acids, and holds up in hot contaminated chloride media that attack alloy 625 and C-276.
Industry Applications
Why this grade
Inconel 686 raises the tungsten over 625 and reaches a PREN of 65 or better, outperforming both 625 and Hastelloy C-276 in ASTM G48 pitting tests. It resists uniform corrosion in oxidising and reducing conditions alike. It costs more than 625, so it is the grade to reach for when the service has already defeated 625 rather than the default.
| Industry | Typical use |
|---|---|
| Pollution control | Flue-gas desulphurisation absorbers, ducting and stack liners. |
| Waste treatment | Incineration scrubbers and acid-condensate handling. |
| Chemical processing | Mixed-acid service, bleaching and halide-bearing streams. |
| Oil and gas | High-chloride sour-service equipment. |
| Pulp and paper | Chlorine dioxide bleaching plant. |
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.