Inconel 625 UNS N06625 W.Nr.2.4856 Round Bar Bright Rod Inconel 625 Properties
Nickel Alloy 625
Nickel Alloy 625 is used both for its high strength and outstanding aqueous corrosion resistance. The strength of Nickel Alloy 625 is primarily a solid solution effect from molybdenum and columbium. Nickel Alloy 625 has excellent weldability. The matching filler metals are often used for dissimilar metal joining and to weld the aqueous corrosion alloy AL-6XN®.
Features of Nickel Alloy 625
The key features of Nickel Alloy 625 include:
• Outstanding resistance to chloride pitting and crevice corrosion cracking
• Immune to chloride ion stress corrosion cracking
• Resistant to caustics
• Resistant to seawater, in both flowing and stagnant • conditions, and under fouling
Applications of Nickel Alloy 625
Typical Applications for the Nickel Alloy 625 include:
• Chemical process equipment handling mixed acids both oxidizing and reducing
• Flue gas desulfurization scrubbers
• Evaporators for wet-process phosphoric acid containing H2SO4, HF and ferric salts
• Weld Overlay
Composition of Nickel Alloy 625
The composition range for Nickel Alloy 625 is provided in table 1.
Table 1. Composition of nickel alloy 625.
| Chemistry, % | AMS 4967 |
| | Min | Max |
| Chromium | 20.00 | 23.0 |
| Nickel | 58.00 | Balance |
| Molybdenum | 8.00 | 10.00 |
| Cobalt | - | 1.00 |
| Columbium + Tantalum | 3.15 | 4.15 |
| Aluminum | - | 0.40 |
| Titanium | - | 0.40 |
| Carbon | - | 0.10 |
| Iron | - | 5.00 |
| Manganese | - | 0.50 |
| Silicon | - | 0.50 |
| Phosphorus | - | 0.015 |
| Sulfur | - | 0.015 |
Specifications
The various forms of nickel alloy 625 are covered by the following standards:
• UNS/W. Nr N06625/2.4856
• Rod and bar ASTM B 446 and ASME SB-446 Gr 1
Physical Properties of Nickel Alloy 625
| Density: | 0.305 lb/inch3 |
| Melting Range: | 2350-2460°F |
Thermal Properties of Nickel Alloy 625
The thermal properties of Nickel Alloy 625 are summarised in table 2.
Table 2. Thermal properties of Nickel Alloy 625.
| Temp | Coefficient of Thermal Exp. | Thermal Conductivity | Modulus of Elasticity Dynamic |
| °F | in/in °F x 10-6 | Btu. ft/ft2.hr°F | psi x 106 |
| 70 | - | 5.7 | 29.8 |
| 400 | 7.3 | 7.2 | 28.4 |
| 600 | 7.4 | 8.2 | 27.5 |
| 800 | 7.6 | 9.1 | 26.6 |
| 1000 | 7.8 | 10.1 | 25.6 |
| 1200 | 8.2 | 11.0 | 24.4 |
| 1400 | 8.5 | 12.0 | 23.1 |
| 1600 | 8.8 | 13.2 | - |
Typical Mechanical Properties of Nickel Alloy 625
The thermal properties of Nickel Alloy 625 are summarised in table 2.
Table 2. Thermal properties of Nickel Alloy 625.
| Temp | Coefficient of Thermal Exp. | Thermal Conductivity | Modulus of Elasticity Dynamic |
| °F | in/in °F x 10-6 | Btu. ft/ft2.hr°F | psi x 106 |
| 70 | - | 5.7 | 29.8 |
| 400 | 7.3 | 7.2 | 28.4 |
| 600 | 7.4 | 8.2 | 27.5 |
| 800 | 7.6 | 9.1 | 26.6 |
| 1000 | 7.8 | 10.1 | 25.6 |
| 1200 | 8.2 | 11.0 | 24.4 |
| 1400 | 8.5 | 12.0 | 23.1 |
| 1600 | 8.8 | 13.2 | - |
Typical Mechanical Properties of Nickel Alloy 625
The minimum mechanical properties of nickel alloy 625 are provided in table 3.
Table 3. Minimum Specified Tensile Properties, Room Temperature ASTM B 446 Bar, Grade 1
| Property | Value |
| Ultimate Tensile Strength | 120 ksi |
| 0.2% Yield | 60 ksi |
| Elongation (2”) | 30% |
Corrosion Resistance of Nickel Alloy 625
Table 4. Corrosion by quiet & flowing seawater, Wrightsbille Beach, NC.
| Alloy | | Quiet | | Flowing, 2 ft/sec |
| | Weight Loss, g | Range of Pit Depth, mils | Weight Loss, g | Range of Pit Depth, mils |
| | | Panel | Crevice Area | | Panel | Crevice Area |
| 625 | Nil | Nil | Nil | 0.25 | Nil | Nil |
| C-276 | Nil | Nil | Nil | 0.10 | Nil | Nil |
| René 41 | 0.80 | Nil | Nil | 0.30 | Nil | Nil |
| X | 0.10 | Nil | Nil | 0.60 | Nil | Nil |
| 825 | 0.25 | 0-1 | 0-9 | 0.20 | 3-6 | 1-26 |
| 718 | 2.70 | Nil | 37-165P | 5.15 | Nil | 40-165P |
Test duration two years. P=perforated by local attack
Table 5. Crevice corrosion temperature (CCT).
| Alloy | UNS No. | Molybdenum Content | °C | °F | Pitting Resistance Equivalent, (PRE)N |
| 316L | S31603 | 2.1 | -3 | 27 | 23 |
| 825 | N08825 | 2.7 | -3 | 27 | 30 |
| 2205 | S31803 | 3.1 | 20 | 68 | 38 |
| 317L | S31703 | 3.2 | 2 | 35 | 29 |
| AL-6XN® | N08367 | 6.2 | 43 | 110 | 48 |
| 625 | N06625 | 9.0 | 45 | 113 | 51 |
| C-276 | N10276 | 15.4 | 55 | 130 | 66 |
10% FeCl3.6H2O, per ASTM G 48 Practice B
(PRE) N=Cr + 3.3Mo + 16N
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