Alloy 690
- ALLOY 690 • UNS N06690 • WNR 2.4642
Alloy 690 is a high-chromium nickel alloy having excellent resistance to many corrosive aqueous media and hightemperature atmospheres. The alloy’s high chromium content gives it excellent resistance to caturisation, metal dusting, oxidation and sulfidation at high temperature. In addition to its corrosion resistance, alloy 690 has high strength, good metallurgical stability, and favorable fabrication characteristics.
- Available Tube Product form
- Straight
- Seamless
- Typical Applications
- Heat exchangers
- Steam Generators
- High temperature applications exposed to caustic solutions
- Industries predominantly using this Grade
- Chemical processes
- Oil and gas
- Nuclear and Power
- Typical Manufacturing Specifications
- ASTM B167
- Also individual customer specifications.
- Technical Data
Mechanical Properties
| Temper | Annealed | |
| Tensile Rm | 86 | ksi (min) |
| Tensile Rm | 590 | MPa (min) |
| R.p. 0.2% Yield | 35 | ksi (min) |
| R.p. 0.2% Yield | 240 | MPa (min) |
| Elongation (2” or 4D gl) | ≥30 | % (min) |
Physical Properties (Room Temperature)
| Specific Heat (0-100°C) | 450 | J.kg-1.°K-1 |
| Thermal Conductivity | 13.5 | W.m -1.°K-1 |
| Thermal Expansion | 14 | μm/μm/°C |
| Modulus Elasticity | 211 | GPa |
| Electrical Resistivity | 1.26 | Ohm-cm |
| Density | 8.2 | g/cm3 |
Chemical Composition (% by weight)
| Element | Min | Max |
| C | - | 0.05 |
| Si | - | 0.5 |
| Mn | - | 0.5 |
| P | - | 0.02 |
| S | - | 0.015 |
| Ai | - | 0.5 |
| Cr | 27 | 31 |
| Cu | - | 0.5 |
| Fe | 7 | 11 |
| Ti | - | 0.5 |
| Ni | Balance | |
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