Alloy 625 - AMS 5599, AMS 5666, UNS N06625
Inconel® 625 (AMS 5599, UNS N06625) is a nickel-based superalloy with excellent resistance to oxidation and corrosion. The nickel-chromium matrix of this material is reinforced by the addition of molybdenum and niobium, which is alloyed through solid solution strengthening. This process allows alloy 625 to maintain high strength and toughness at temperatures ranging from cryogenic up to 1800°F (982°C). It is non-magnetic, austenitic, and displays high tensile strength, fabricability, and brazeability. Due to its high nickel content, this alloy is nearly immune to chloride ion stress-corrosion cracking and pitting, which is commonly found in thin-walled seawater applications like heat exchangers, fasteners, and cable sheathing. We sell alloy 625 materials in sheet, coil, plate and round bar.
625 Inventory Size Ranges
0.1875" - 2.000"
0.375" - 8.750"
Characteristics of Inconel 625
- High strength and mechanical properties at both cryogenic and high temperatures.
- High oxidation resistance at temperatures up to 1050°C.
- High tensile, creep, and rupture strength.
- Good resistance to oxidizing and reducing acids such as nitric, sulfuric, hydrochloric and phosphoric acid.
- Virtually immune to chloride ion stress-corrosion cracking and pitting, making it ideal for marine applications.
- Excellent weldabilty
Working with Inconel 625
Alloy 625 can be cold formed, hot worked, and machined through most standard methods. Hot forming should be done at temperature ranges of 1700 – 2150°F (927-1177°C), and care should be taken when cold working and machining, as it work hardens more quickly than more traditional austenitic stainless steels. Recommend using rigid, powerful machines with sharp tooling at positive rake angles, with tools changed frequently to maintain sharpness. Heavy constant feeds are advised to maintain a positive cutting action with proper lubrication. All 625 may be welded through typical gas shielded processes.
Heat treatment of Inconel 625
This alloy has three primary heat treatments – solution annealing at 2000-2200°F (1093 – 1204°C) with air or rapid quenching, annealing at 1600-1900°F (927-1038°C) with air or rapid quenching, and stress relieving at 1100-1600°F(593 – 900°C) with air quenching. Each process results in different characteristics, with the high temperature annealing used for applications above 1500°F where creep resistance is important. The medium temperature annealing provides optimal tensile and rupture properties up to 1900°F (1038°C), while the stress relieved state is recommended for applications under 1200°F (649°C), where maximum fatigue, hardness and yield strength are required.
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Standard Inventory Specifications
625 Sheet, Coil and Plate:
- UNS N06625
- UNS N06626-625LCF
- AMS 5599
- ASTM B 443 Gr 1
- ASME SB 443 Gr 1
- UNS N06625
- UNS N06626-625LCF
- AMS 5666
- ASTM B 446
Other industry standards we comply with:
- EN 2.4856
- EN 10204
- DFARS Compliant
- RR SABRe Edition 2
- GE Aircraft Engine (GT193)
- GE Aviation S-SPEC-35 AeDMS S-400
- PWA LCS
Common Trade Names
- Alloy 625
- Nickel 625
- Inconel 625 (® Special Metals)
- Haynes 625 (® Haynes International)
Common Applications of 625
- Aerospace components
- Chemical Processing
- Propeller blades
- Submarine propulsion motors
- Utility boat exhaust ducts
- Steam-line bellows
- Heat Exchangers
- Flue gas desulfurization scrubbers
- Chemical processing equipment for oxidizing and reducing acids
- Marine components exposed to seawater, such as fasteners and cable connectors
|Element||Percent by Weight|
|Cr||Chromium||20.00 - 23.00|
|Mo||Molybdenum||8.00 - 10.00|
|Nb||Columbium||3.15 - 4.15|
- Density: 0.303 lb/in3 (8.44 g/cm3
- Specific Gravity: 8.44
- Melting Range: 2350 - 2460°F (1280 - 1350°C)
- Specific Heat: 0.098 Btu/lb x °F (410 Joules/kg x °K)
- Magnetic Permeability (75°F, 200 oersted): 1.0006
|Temperature Range||Linear Coefficients of Thermal Expansion1 · 10-6||Thermal Conductivity2 3|
- Average coefficient from 70°F (21°C) to temperature shown
- Measurements made at Battelle Memorial Institute
- Material annealed 2100°F (1149°C)
Mechanical Properties and Yield Strength
|Temperature||0.2% Yield Strength||Ultimate Tensile Strength||Elongation Percent|
The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.
*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.