Inconel 690 Tube Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies Inconel 690 tube (N06690, Werkstoff 2.4642) to ASTM B163 and B167 from Mumbai, to customers across India and in more than 40 export markets.
Inconel 690 is best known as steam-generator tube: its 27–31% chromium was developed to resist the stress-corrosion cracking that alloy 600 suffered in reactor primary water, and it is now the standard tube alloy for that duty. Nuclear steam-generator tube itself is made under nuclear quality programmes by a small number of mills. Outside the nuclear island, the same chromium makes 690 tube a strong choice for nitric acid condensers and heat exchangers in oxidising service.
Sizes and Specifications
| Grade | Inconel 690 |
|---|---|
| UNS number | N06690 |
| Werkstoff (W.Nr.) | 2.4642 |
| Specifications | ASTM B163 (seamless condenser and heat-exchanger tube); ASTM B167 (seamless pipe and tube); ASTM B829 (general requirements) |
| 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
| 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 690 tube runs around 590–760 MPa tensile. The design reason for it is not strength but its very high resistance to stress-corrosion cracking in pure and caustic water, and its resistance to nitric and mixed acids.
Industry Applications
Why Inconel 690 tube
Choose 690 tube over 600 when the environment is oxidising or the water is hot enough that 600 would crack – the chromium difference, 27–31% against 14–17%, is the whole reason the grade exists. For heat-exchanger bundles ASTM B163 is the tube standard most often cited; B167 covers seamless pipe and tube generally, and B829 sets the general requirements both refer to.
| Industry | Typical use |
|---|---|
| Chemical processing | Condensers and heat exchangers in nitric acid and nitric-hydrofluoric service. |
| Nuclear | Tube for high-temperature water service; steam-generator tube is made under nuclear quality programmes. |
| Power generation | Heat-exchanger tube in coal gasification and high-sulphur combustion plant. |
| Waste treatment | Tube exposed to oxidising, sulphur-bearing 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, positive material identification and ASTM G28 intergranular corrosion testing are available on request, with third-party release under our ISO 9001:2015 system. Nuclear-grade tube carries its own qualification and is quoted separately where it can be sourced.
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.