Alloy 625
- ALLOY 625 • UNS N06625 • WNR 2.4856
Alloy 625 is a nickel-chromium-molybdenum alloy used for its high strength, excellent fabricability and outstanding corrosion resistance. Service temperatures can range from cryogenic to 980°C (1800°F). Alloy 625 strength is derived from the solid solution strengthening effect of molybdenum and niobium on its nickel-chromium matrix.
Thus precipitation-hardening treatments are not required. This combination of elements also is responsible for superior resistance to a wide range of corrosive environments of unusual severity as well as to high-temperature effects such as oxidation and carburization.
- Available Tube Product form
- Straight
- Coiled
- Seamless
- Seam welded, cold redrawn and annealed
- Typical Applications
- Wellhead components
- Sheathing
- Downhole equipment for corrosive/ sour service
- Reactor core
- Control rod components
- Gas pipeline control lines
- Heat exchangers
- Oil refining
- Chemical processing
- Control and instrumentation tubes
- Industries predominantly using this Grade
- Chemical processes
- Oil and gas
- Nuclear and Power
- Typical Manufacturing Specifications
- ASTM B444
- AMS 5581
- BS 3074
- Also individual customer specifications.
- Technical Data
Mechanical Properties
| Temper | Annealed (Grade1) | Solution-annealed (Grade 2) | ||
| Tensile Rm | 120 | ksi (min) | 100 | ksi (min) |
| Tensile Rm | 827 | MPa (min) | 690 | MPa (min) |
| R.p. 0.2% Yield | 60 | ksi (min) | 40 | ksi (min) |
| R.p. 0.2% Yield | 414 | MPa (min) | 276 | MPa (min) |
| Elongation (2” or 4D gl) | 30 | % (min) | 30 | % (min) |
Physical Properties (Room Temperature)
| Specific Heat (0-100°C) | 460 | J.kg-1.°K-1 |
| Thermal Conductivity | 14.8 | W.m -1.°K-1 |
| Thermal Expansion | 12.4 | μm/μm/°C |
| Modulus Elasticity | 207 | GPa |
| Electrical Resistivity | 10.3 | Ohm-cm |
| Density | 8.42 | g/cm3 |
Chemical Composition (% by weight)
| Element | Min | Max |
| C | - | 0.1 |
| Si | - | 0.5 |
| Mn | - | 0.5 |
| P | - | 0.015 |
| S | - | 0.015 |
| Ai | - | 0.4 |
| Cr | 20 | 23 |
| Cu | 1 | 1.4 |
| Fe | - | 5 |
| Mo | 8 | 10 |
| Nb | 3.15 | 4.15 |
| Ni | Balance | |
| Ti | - | 0.4 |
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