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Inconel 925 UNS N09925

Inconel 925 UNS N09925 is a nickel-chromium alloy with good oxidation resistance at higher temperatures, with good resistance in carburizing and chloride containing environments.

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Product Description

Introduction to Inconel 925

Inconel 925 is a high-performance nickel-iron-chromium alloy that belongs to the INCOLOY family. It is designed to provide a combination of high strength and excellent corrosion resistance, making it suitable for a wide range of demanding applications.

Chemical Composition

Inconel 925 is composed of nickel, chromium, molybdenum, copper, titanium, and aluminum. The specific composition ranges are as follows:

Nickel (Ni): 42.0-46.0%
Chromium (Cr): 19.5-22.5%
Iron (Fe): ≥22%
Molybdenum (Mo): 2.5-3.5%
Copper (Cu): 1.5-3.0%
Titanium (Ti): 1.9-2.4%
Aluminum (Al): 0.1-0.5%
Carbon (C): ≤0.03%
Manganese (Mn): ≤1.0%
Silicon (Si): ≤0.5%
Sulfur (S): ≤0.03%

Mechanical Properties

Inconel 925 exhibits excellent mechanical properties, both at room temperature and in high-temperature environments:

Tensile Strength: ≥1154 MPa (after solution annealing and aging)
Yield Strength: ≥832 MPa (after solution annealing and aging)
Elongation: ≥27% (after solution annealing and aging)
Density: 8.08-8.14 g/cm³
Melting Point: 1311-1366°C

Corrosion Resistance

Inconel 925 is highly resistant to various forms of corrosion, including:

General Corrosion: It resists corrosion in both reducing and oxidizing environments.
Pitting and Crevice Corrosion: The molybdenum and copper content enhance resistance to localized corrosion.
Stress-Corrosion Cracking: The alloy is resistant to chloride-ion stress-corrosion cracking and sulfide stress cracking, making it suitable for use in sour (H₂S-containing) environments.

Applications

Due to its superior properties, Inconel 925 is widely used in the following industries:

Aerospace: For components in jet engines and rocket engines.
Oil and Gas: For down-hole and surface components, such as tubular products, valves, and hangers.
Marine: For marine shafting and other components exposed to seawater.
Chemical Processing: For equipment that handles corrosive chemicals like sulfuric acid and phosphoric acid.
Nuclear Industry: For components in nuclear reactors.

Processing and Fabrication

Inconel 925 can be processed using various methods, including hot and cold working, welding, and heat treatment. The alloy is typically supplied in solution-annealed and aged condition to achieve its high strength. It is available in various forms, such as bars, plates, pipes, and forgings.

Conclusion

Inconel 925 is a versatile and reliable material, ideal for applications where high strength and corrosion resistance are critical. Its unique combination of properties makes it a preferred choice in many high-performance industries

Tensile Data

Mechanical Property Requirements
	Ultimate Tensile	Yield Strength (0.2% OS)	Elong. in 2 in. or 50mm or 4D, min., %	R/A	Hardness
Cold Worked/As worked
Min	110 KSi	85 KSi	10
Max
Min	760 MPa	585 KSi
Max
Hot Worked/As worked
Min	90 KSi	40 KSi	25
Max
Min	620 MPa	275 MPa
Max

D- Forging quality is furnished to chemical requirements and surface inspection only. No mechanical properties required.

Specifications

Form	Standard
Metal Type	UNS N09925
Bar	ASTM B637 AMS 5662
Wire	ASTM B805
Sheet	ASTM B906 AMS 5664
Plate	ASTM B906 AMS 5664
Tube	ASTM B829
Pipe	ASTM B829
Fitting	ASTM B829
Forging	ASTM B670
Weld Wire
Weld Electrode
Din

Machining

Machinability Ratings

MACHINING DATA
Carbide tools are suggested for rates better than 50% of Type 304.
Machining Type	Suggested starting rates are:
Single Point turning :	Roughing - 0.15" depth, 0.015"/rev feed -175 SFM Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM
Drilling :	1/4" Dia hole - 0.004"/rev feed - 60 SFM 1/2" Dia hole - 0.007"/rev feed - 60 SFM 3/4" Dia hole - 0.010"/rev feed - 60 SFM
Reaming :	Feed - same as drilling - 100 SFM
Side and Slot Milling :	Roughing - 0.25" depth - 0.007"/tooth feed - 125SFM Finishing - 0.050" depth - 0.009"/tooth feed - 140SFM
These rates are for carbide tools, Type C-2 for roughing, drilling and reaming. Type C-3 for finishing.

Inconel 925 UNS N09925

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Inconel 925 UNS N09925

Chemical Composition

Mechanical Properties

Corrosion Resistance

Applications

Processing and Fabrication

Conclusion

Chemical Composition

Mechanical Properties

Corrosion Resistance

Applications

Processing and Fabrication

Conclusion

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