Inconel 625 (UNS N06625) is an oxidation and corrosion resistant alloy wilsonpipeline supplies in flanges, bar, pipe, tubes, gaskets, and pipe fittings. Inconel 625 is employed for its outstanding aqueous corrosion resistance as well as strength. The outstanding toughness and strength to the alloy is because of adding niobium which acts using the molybdenum to stiffen the alloy’s matrix.
Alloy 625 has stress-corrosion cracking resistance to chloride ions and fatigue strength. The nickel alloy has high weldability and is useful for welding AL-6XN. This alloy resists an array of severely corrosive environments which is especially resistant against pitting and crevice corrosion.
Chemical Composition, %
The chemical composition of Inconel 625 (UNS N06625) is provided in the table below:
| Cr | Ni | Mo | Co + Nb | Ta | Al | Ti | C | Fe | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 20.00-30.00 | Remainder | 8.0-10.0 | 1.0 max | 3.15-4.15 | .40 max | .40 max | .10 max | 5.0 max | .50 max | .50 max | .015 max | .015 max |
Forms of Inconel 625 (UNS N06625)
- Inconel 625 flanges
- Inconel 625 Bolts and Nuts Fasteners
- Bar
- Pipe & Tube (welded & seamless)
- Inconel 625 pipe fitting.
Properties of Inconel 625 (UNS N06625)
The key properties of Inconel 625 are:
- High creep-rupture strength
- Non-magnetic
- Oxidation resistant to 1800° F
- Seawater pitting and crevice corrosion resistant
- Immune to chloride ion stress corrosion cracking.
Mechanical Properties (Representative Tensile Properties, bar, 1800° F anneal)
The mechanical properties of Inconel 625 (UNS N06625) are:
| Temp° F | Tensile (psi) | .2% Yield (psi) | Elongation in 2 “ (%) |
|---|---|---|---|
| 70 | 144,000 | 84,000 | 44 |
| 400 | 134,000 | 66,000 | 45 |
| 600 | 132,000 | 63,000 | 42.5 |
| 800 | 131,500 | 61,000 | 45 |
| 1000 | 130,000 | 60,500 | 48 |
| 1200 | 119,000 | 60,000 | 34 |
| 1400 | 78,000 | 58,500 | 59 |
| 1600 | 40,000 | 39,000 | 117 |
Fabrication with Inconel 625 (UNS N06625)
Inconel 625 has excellent welding and forming characteristics. It could be hot worked or forged if your climate is maintained in the plethora of about 1800-2150° F. In order to control grain size, finish hot working operations should be performed in the lower end from the temperature range.
Due to the good ductility, alloy 625 can be readily formed by cold working. Because the alloy work-hardens rapidly, intermediate annealing treatments are usually necesary for complicated component forming operations.
For restoring a fantastic balance of properties, all cold or hot worked parts should be annealed and rapidly cooled. This nickel alloy may be welded by both manual and automatic welding methods, including gas tungsten arc, gas metal arc, electron beam and resistance welding. It shows good restraint welding characteristics.
ASTM Specifications
The ASTM specifications of Inconel 625 (UNS N06625) are:
| Pipe Smls | Pipe Welded | Tube Smls | Tube Welded | Sheet/Plate | Bar | Forging | Fitting | Wire |
|---|---|---|---|---|---|---|---|---|
| B444 | B705 | B444 | B704 | B443 | B446 | – | – | – |
Applications
The applications of Inconel 625 (UNS N06625) are:
- Aircraft ducting systems
- Aerospace
- Jet engine exhaust systems
- Engine thrust-reverser systems
- Specialized seawater equipment
- Chemical process equipment.
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