Inconel 690 Tube Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies inconel 690 tube (N06690, Werkstoff 2.4642) from ready stock in Mumbai, to customers across India and in more than 40 export markets.
Tube is specified by outside diameter and wall thickness rather than nominal bore, which makes it the form of choice for heat exchangers, instrumentation and any assembly where the fit into a tubesheet or fitting is what governs.
Inconel 690 carries nearly twice the chromium of alloy 600, which is why it replaced it for nuclear steam-generator tubing.
Sizes and Specifications
| Grade | Inconel 690 |
|---|---|
| UNS number | N06690 |
| Werkstoff (W.Nr.) | 2.4642 |
| Specifications | ASTM B166 (rod, bar and wire), B167 (pipe and tube), B168 (sheet, plate and strip) |
| 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 | N06690 |
| Werkstoff / EN number | 2.4642 |
| Density | 8.19 g/cm3 |
| Melting range | 1343-1377 °C |
| Specific heat | 450 J/kg·°C |
| Electrical resistivity | 1.148 µΩ·m |
| Magnetic permeability (at 200 oersted / 15.9 kA/m) | 1.001 |
| Young's modulus | 211 GPa |
| Poisson's ratio | 0.289 |
| Pipe and tube specification | ASTM B163 / B167 / B829 |
Identifiers and physical constants for Inconel 690. A dash means no such designation is published for this grade.
Chemical Composition
Nickel 58% minimum with an unusually high 27-31% chromium and 7-11% iron. The chromium level is what drives its resistance to oxidising acids and high-temperature corrosion.
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 58.0 | — |
| Chromium (Cr) | 27.0 | 31.0 |
| Iron (Fe) | 7.0 | 11.0 |
| Carbon (C) | — | 0.05 |
| Silicon (Si) | — | 0.50 |
| Manganese (Mn) | — | 0.50 |
| Sulfur (S) | — | 0.015 |
| Copper (Cu) | — | 0.50 |
Composition limits for Inconel 690. 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 590-760 MPa. Very high resistance to stress-corrosion cracking in pure and caustic water, plus excellent nitric and mixed-acid resistance.
Industry Applications
Why this grade
Inconel 690 is the high-chromium modification of 600, at 27-31% chromium against 600's 14-17%, with nickel down to around 58%. It was developed specifically to resist the stress-corrosion cracking that affected 600 in nuclear steam generators, and is generally regarded as immune to it. That chromium also gives it strong resistance in highly oxidising environments.
| Industry | Typical use |
|---|---|
| Nuclear | Steam-generator tubing, reactor internals and reprocessing equipment. |
| Chemical processing | Nitric and mixed-acid service, and nitric-hydrofluoric pickling. |
| Glass manufacturing | Forehearths, stirrers and glass-contact hardware. |
| Power generation | Coal gasification and high-sulphur combustion equipment. |
| Waste treatment | Incineration hardware exposed to oxidising ash. |
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.