.png)
Alloy 625 Technical Overview
Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to stiffen the alloy's matrix and thereby provide high strength without a strengthening heat treatment. Alloy 625 resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. It is used in chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors. Its outstanding strength and toughness in the temperature range cryogenic to 2000°F (1093°C) are derived from the effects of columbium (niobium) and molybdenum on the nickel-chromium matrix. Steel Emporium provides Grade 625 pipes and tubes in all standard and custom schedules.
Key Advantages & Features
Marine Stability
Excellent resistance to sea water and brackish water, even in stagnant conditions.
High Fatigue Strength
Superb fatigue and corrosion-fatigue strength for demanding structural apps.
Pitting Resistance
High PREN value ensures immunity to crevice corrosion and chloride pitting.
| Grade | Ni | Cr | Mo | Nb+Ta | Fe | C | Mn | Si |
|---|---|---|---|---|---|---|---|---|
| Inconel 625 | 58.0 min | 20.0 - 23.0 | 8.0 - 10.0 | 3.15 - 4.15 | 5.0 max | 0.10 max | 0.50 max | 0.50 max |
| Form | Tensile Strength (MPa) | Yield Strength (0.2% offset) | Elongation (%) |
|---|---|---|---|
| Seamless Pipe/Tube | 827 MPa (120 ksi) | 414 MPa (60 ksi) | 30% |
| Welded Pipe/Tube | 827 MPa (120 ksi) | 414 MPa (60 ksi) | 30% |
| Sheet / Plate | 827 MPa (120 ksi) | 414 MPa (60 ksi) | 30% |
| Property | Value |
|---|---|
| Density | 8.44 g/cm³ (0.305 lb/in³) |
| Melting Range | 1290 - 1350 °C (2350 - 2460 °F) |
| Specific Heat | 410 J/kg·°C (0.098 Btu/lb·°F) |
| Magnetic Permeability (20°C) | 1.0006 |
| Standard | UNS Number | Werkstoff No. | AFNOR | Common Name |
|---|---|---|---|---|
| Alloy 625 | N06625 | 2.4856 | NC22DNb | Inconel 625 |
| Nominal Size (NB) | OD (mm) | SCH 10 | SCH 40 | SCH 80 |
|---|---|---|---|---|
| 1/2" | 21.34 | 1.34 | 1.71 | 2.24 |
| 1" | 33.40 | 2.21 | 3.42 | 4.48 |
| 2" | 60.33 | 4.16 | 5.75 | 7.91 |
| 3" | 88.90 | 7.09 | 11.95 | 16.16 |
| 4" | 114.30 | 11.68 | 17.03 | 23.65 |
Industrial Applications
Marine Engineering
Sheathing for undersea cables, submarine motors.
Aerospace
Ducting systems and engine exhaust systems.
Chemical Process
Equipment handling highly corrosive acids.
Nuclear Industry
Reactor core and control-rod components.
Pollution Control
Scrubber systems and chimney liners.
Oil & Gas
Sour gas production piping and flares.