Project Description
N09925 (Incoloy 925 / UNS N09925) Nickel Alloy Steel – Premium Age-Hardening Corrosion Resistant Alloy
Material Designation: 110K | High-Performance Nickel-Iron-Chromium Superalloy for Critical Oil & Gas Applications
Introduction to N09925 Nickel Alloy
N09925, commonly known as Incoloy 925 or by its UNS designation N09925, is a premium age-hardening nickel-iron-chromium alloy that has been specifically engineered to deliver exceptional performance in the most demanding corrosive environments. As a leading manufacturer of high-quality oilfield steel products, SHUNFU METAL is proud to offer this advanced superalloy to customers worldwide who require materials capable of withstanding extreme conditions.
This nickel-based superalloy combines the outstanding corrosion resistance of Alloy 825 with significantly enhanced mechanical strength achieved through precipitation hardening. The addition of titanium and aluminum enables age hardening, resulting in a material that offers both superior corrosion resistance and high strength—a combination that is essential for critical applications in the oil and gas industry, chemical processing, and marine environments.
At SHUNFU METAL, we manufacture N09925 using stringent quality control processes and advanced metallurgical techniques to ensure that every product meets the highest industry standards. Our state-of-the-art facilities enable us to produce this sophisticated alloy in various forms and dimensions, making us your trusted partner for all corrosion-resistant alloy requirements.
Key Features & Advantages of N09925
Exceptional Corrosion Resistance
Outstanding resistance to general corrosion, pitting, crevice corrosion, and stress corrosion cracking in sour gas environments containing H₂S and CO₂.
High Strength Through Age Hardening
Precipitation hardening mechanism provides significantly higher strength than solution-annealed nickel alloys, with yield strength up to 758 MPa.
Excellent Sulfide Stress Cracking Resistance
Superior resistance to sulfide stress cracking (SSC) makes it ideal for sour service applications in oil and gas production.
Wide Temperature Range Performance
Maintains excellent mechanical properties and corrosion resistance from cryogenic temperatures up to elevated operating temperatures.
Applications of N09925 Nickel Alloy
The unique combination of high strength and exceptional corrosion resistance makes N09925 the material of choice for numerous critical applications across various industries. As a professional manufacturer, SHUNFU METAL supplies this premium alloy for the following applications:
Oil and Gas Industry Applications
N09925 is extensively used in the oil and gas sector, particularly in environments where sour gas (containing hydrogen sulfide) is present. The alloy’s resistance to sulfide stress cracking and hydrogen embrittlement makes it invaluable for:
- Downhole tubing and casing in sour gas wells
- Wellhead components and valves
- Production piping and flowlines
- Subsea equipment and components
- Completion equipment and accessories
- Gas lift mandrels and side pocket mandrels
Chemical Processing Industry
The chemical processing industry relies on N09925 for equipment handling corrosive media, including:
- Sulfuric acid handling equipment
- Phosphoric acid production components
- Heat exchangers and condensers
- Reactor vessels and pressure vessels
Marine and Offshore Applications
The alloy’s excellent resistance to seawater corrosion and chloride-induced stress corrosion cracking makes it suitable for offshore platforms, marine fasteners, propeller shafts, and other components exposed to seawater environments.
Applicable Standards & Equivalent Grades
SHUNFU METAL manufactures N09925 in full compliance with international standards. Our quality management system is ISO 9001 certified, ensuring consistent product quality for all our customers.
International Standards
| Standard Organization | Specification | Product Form |
|---|---|---|
| UNS | N09925 | All Forms |
| API | API 6A CRA (110K) | Wellhead Components |
| ASTM | ASTM B805 | Bar & Forging Stock |
| NACE | MR0175 / ISO 15156 | Sour Service |
| ISO | ISO 15156-3 | CRA for Sour Service |
Equivalent & Similar Grades
N09925 is known by various trade names and designations worldwide:
- Trade Name: Incoloy 925, Alloy 925
- Material Designation: 110K (per API 6A)
- W.Nr: 2.4858 (similar base composition)
- Related Alloys: Alloy 825 (non-age-hardenable version), Alloy 718
Chemical Composition of N09925
The carefully balanced chemical composition of N09925 is engineered to provide optimal corrosion resistance and age-hardening capability. SHUNFU METAL strictly controls all chemical elements to ensure compliance with specifications. Below is the nominal chemical composition (weight %):
| Element | N09925 Composition (%) |
|---|---|
| Nickel (Ni) | 42.0 – 46.0 |
| Chromium (Cr) | 19.5 – 22.5 |
| Iron (Fe) | 22.0 min (Balance) |
| Molybdenum (Mo) | 2.50 – 3.50 |
| Titanium (Ti) | 1.90 – 2.40 |
| Copper (Cu) | 1.50 – 3.00 |
| Aluminum (Al) | 0.10 – 0.50 |
| Niobium (Nb) | 0.08 – 0.50 |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 0.35 max |
| Carbon (C) | 0.025 max |
| Phosphorus (P) | 0.020 max |
| Sulfur (S) | 0.003 max |
Note: The low carbon and sulfur contents are critical for maintaining corrosion resistance and weldability. The titanium and aluminum additions enable the age-hardening response.
Available Sizes & Dimensions
As a professional manufacturer with extensive production capabilities, SHUNFU METAL offers N09925 in a comprehensive range of sizes to meet diverse application requirements. We maintain regular stock of common sizes for quick delivery and welcome custom orders for specific dimensions.
Forged Round Bars
Diameter: 80mm – 1200mm
Condition: As-forged, rough machined, or finished
Length: According to customer requirements
Rolled Round Bars
Diameter: 10mm – 300mm
Condition: Hot rolled, peeled, or ground
Length: Standard or custom lengths
Additional Product Forms
SHUNFU METAL also provides N09925 in other forms including:
- Hollow bars (bored bars)
- Forgings (open die and closed die)
- Blocks and billets
- Custom shapes per drawing
✓ Regular sizes in stock for fast delivery | ✓ Custom sizes available | ✓ Bulk orders welcome
Melting Process & Manufacturing
The superior quality of N09925 depends heavily on the melting and refining processes used during production. SHUNFU METAL employs advanced melting techniques to ensure the highest material purity and consistency.
Primary Melting Route (Option A)
Step 1: Basic Electric Furnace (EF) melting
Step 2: AOD, VOD, or Vacuum Degassing
Step 3: ESR, EFR, or VAR refining
Optional Step 4: VAR (Vacuum Arc Remelting)
Alternative Melting Route (Option B)
Step 1: Vacuum Induction Melting (VIM)
Step 2: ESR, EFR, or VAR refining
Optional Step 3: VAR (Vacuum Arc Remelting)
These controlled melting sequences ensure low levels of inclusions, precise chemistry control, and optimal microstructure for demanding applications.
Heat Treatment Procedures for N09925
Proper heat treatment is essential to achieve the optimal combination of strength and corrosion resistance in N09925. The alloy undergoes a two-stage heat treatment process consisting of solution annealing followed by age hardening.
| Treatment Stage | Temperature | Time | Cooling |
|---|---|---|---|
| Solution Annealing | 1825°F – 1925°F (996°C – 1052°C) | 0.5 – 4 hours | Rapid cooling (water quench or air cool) |
| Age Hardening – Stage 1 | 1325°F – 1400°F (718°C – 760°C) | 4 – 9 hours | Furnace cool to Stage 2 temperature |
| Age Hardening – Stage 2 | 1125°F – 1220°F (607°C – 660°C) | 12 hours minimum (total aging time) | Air cool to room temperature |
Note: Heat treatment parameters may be adjusted based on section size and specific property requirements. SHUNFU METAL’s experienced metallurgists can recommend optimal heat treatment cycles for your application.
Mechanical Properties of N09925 (110K)
N09925 in the age-hardened condition exhibits excellent mechanical properties that make it suitable for high-stress applications. The following tables present the minimum mechanical property requirements.
Tensile Properties
| Cross-Section Thickness | 0.2% Yield Strength Min. | 0.2% Yield Strength Max. | Tensile Strength Min. | Elongation Min. | Reduction of Area Min. |
|---|---|---|---|---|---|
| ≤10 in. (≤254 mm) | 110 ksi (758 MPa) | 140 ksi (965 MPa) | 140 ksi (965 MPa) | 18% | 25% |
| >10 in. (>254 mm) | 110 ksi (758 MPa) | 140 ksi (965 MPa) | 140 ksi (965 MPa) | 18% | 20% |
Charpy V-Notch Impact Toughness (10mm x 10mm specimen)
| Cross-Section Thickness | Orientation | Average Min. | Single Min. | Lateral Expansion Min. |
|---|---|---|---|---|
| <3 in. (<76 mm) | Longitudinal | 35 ft-lbs (47 J) | 32 ft-lbs (43 J) | 0.015 in. (0.38 mm) |
| ≥3 in. through 10 in. (≥76 mm – 254 mm) | Transverse | 35 ft-lbs (47 J) | 32 ft-lbs (43 J) | 0.015 in. (0.38 mm) |
| >10 in. (>254 mm) | Transverse | 35 ft-lbs (47 J) | 32 ft-lbs (43 J) | 0.015 in. (0.38 mm) |
Hardness Requirements
| Material Designation | Minimum Hardness HRC (HBW) | Maximum Hardness HRC (HBW) |
|---|---|---|
| 110K | 26 HRC | 38 HRC |
Machining & Processing Services
As a comprehensive manufacturer and processor of specialty alloys, SHUNFU METAL offers extensive machining and processing capabilities to deliver N09925 products ready for your application. Our modern machining facilities are equipped with advanced CNC equipment to handle the challenges of machining this high-performance nickel alloy.
Turning & OD Machining
- Rough turning from forged/rolled stock
- Precision turning to tight tolerances
- Surface finishing and polishing
- Step turning for complex profiles
Boring & ID Machining
- BTA deep hole boring
- Gun drilling for small diameters
- ID honing and finishing
- Roller burnishing for surface quality
Threading Services
- API thread connections
- Premium thread profiles
- Custom thread specifications
- Thread inspection and gauging
Additional Processing
- Heat treatment in-house
- Non-destructive testing (NDT)
- Material certification
- Custom packaging for export
Quality Assurance & Testing
SHUNFU METAL is committed to delivering N09925 products of the highest quality. Our ISO 9001 certified quality management system ensures rigorous control at every stage of production. Each lot of material undergoes comprehensive testing including:
Chemical Analysis
- Optical emission spectrometry (OES)
- Combustion analysis for C and S
- ICP analysis for trace elements
Mechanical Testing
- Tensile testing per ASTM E8
- Charpy impact testing per ASTM E23
- Hardness testing (HRC/HBW)
Non-Destructive Testing
- Ultrasonic testing (UT)
- Magnetic particle inspection (MPI)
- Liquid penetrant testing (PT)
Documentation
- Mill test certificates (EN 10204 3.1/3.2)
- Full traceability records
- Third-party inspection available
Partner with SHUNFU METAL for Your N09925 Requirements
As a trusted manufacturer of high-quality oilfield steel and corrosion-resistant alloys, we are ready to support your projects with premium N09925 products. Whether you need standard stock items or custom-manufactured components, our team is here to help.
✓ Competitive Factory Pricing | ✓ Bulk Order Discounts | ✓ Fast Delivery from Stock | ✓ Custom Manufacturing
Contact Us Today: +86-731-89903933 | [email protected]
© 2025 Hunan ShunFu Metal Material Co., Ltd. – Professional Manufacturer of Oilfield Steel & Corrosion Resistant Alloys
ISO 9001 Certified | Trusted Supplier to Global Oil & Gas Industry
We are committed to integrate steel resources in china and serve the global steel market. Our company has more than 15 years of experience in steel researching, production, managing and sales. And our team mostly are based on and worked in national famous steel enterprise before. In the aspect of resources and information, we have established cooperative relationship with nearly hundred enterprises, either state-owned or private owned in China.
What’s more, we have built long, deep and close business relationship with dozens of steel company, Sharing and holding equities with several steel enterprises. Because of the close cooperation with steel companies and our pioneering spirit, which can ensure us stay at the top competition, and ensure our customers get what they really want. We provide preffesional one-stop service to the Contractors of follows project:
- Oil and Gas Pipeline Construction
- Onshore and Offshore
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- Fire Protection
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Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets we serve. Just give us a call +86-731-89903933.
