Alloy 625
Alloy 625 is a nickel chromium alloy suitable for applications where strength and corrosion resistance are required. The alloy exhibits excellent strength and toughness at temperatures ranging from cryogenic up to 1100ºC.
The higher strength of this alloy is due to additions of molybdenum and niobium. These elements also contribute to the resistance to high temperature oxidation and superior corrosion resistance.
These features make alloy 625 suitable for a wide variety of applications. The excellent resistance to pitting and crevice corrosion is utilised in sea water applications. The high strength and oxidation resistance are beneficial in aerosopace applications. The strength and general corrosion resistance see the alloy also used in heat exchangers, valves, pumps, nuclear reactors and flue gas desulphurisation systems.
Maher stock alloy 625 in the annealed (grade 1) condition which offers the best combination of strength and corrosion resistance. The stock sizes available range between 12 and 250mm diameter.
National Specifications
| ASTM | UNS | SEA AMS | British Standard | Werkstoff |
|---|---|---|---|---|
| B564 B446 |
N06625 | 5666 | 3076 NA21 | 2.4856 |
Material may also be released to Customer Specifications, subject to enquiry.
Technical Data
Nominal Composition by Percent
| C | Mn | Si | P | S | Cr | Ni | CO | Ti | Al | Mo | Cb+Ta | Fe | - | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | 20.0 | 58.0 | - | - | - | 8.0 | 3.15 | - | % |
| Max | 0.10 | 0.50 | 0.50 | 0.15 | 0.15 | 23.0 | - | 1.0 | 0.40 | 0.40 | 10.0 | 4.15 | 5.0 | % |
Typical Mechanical Properties
| Annealed Grade 1 up to 100mm Section |
PSI | MPa | % |
|---|---|---|---|
| Tensile Strength, min | 120,000 | 827 | - |
| Yield Strength (0.2% offset), min |
60,000 | 413 | - |
| Elongation on 4D, min | - | - | 30 |
| Hardness max | - | 35Rc | - |