Project Description
N07725 (Inconel 725) Nickel Alloy Steel – Premium CRA Material from SHUNFU METAL
UNS N07725 | API 6ACRA Standard | High-Performance Corrosion Resistant Alloy for Oil & Gas Industry
Introduction to N07725 Nickel Alloy
SHUNFU METAL, as a professional manufacturer of high-quality oilfield steel products, is proud to offer N07725 (also known as Inconel 725 or Alloy 725) nickel alloy steel. This premium-grade corrosion resistant alloy (CRA) represents the pinnacle of metallurgical engineering, specifically designed to meet the most demanding requirements in the oil and gas industry.
N07725 is a precipitation-hardenable nickel-chromium-molybdenum-niobium alloy that combines the exceptional corrosion resistance of Alloy 625 with significantly higher strength levels achieved through age hardening. The alloy designation “120K” refers to the minimum yield strength specification of 120 ksi (827 MPa), making this material particularly suitable for high-pressure, high-temperature (HPHT) applications where both mechanical strength and corrosion resistance are critical.
At SHUNFU METAL, we maintain strict quality control throughout our manufacturing process, ensuring every N07725 product meets or exceeds API 6ACRA specifications. As a direct manufacturer, we offer competitive pricing for bulk orders and welcome inquiries from procurement professionals worldwide.
Applications and Uses of N07725
The unique combination of high strength, excellent corrosion resistance, and good fabricability makes N07725 an ideal choice for numerous critical applications in harsh environments. SHUNFU METAL supplies N07725 products to customers across multiple industries worldwide.
Oil & Gas Exploration
Downhole equipment, subsea components, wellhead systems, and production tubing in sour gas and deep-water environments where H₂S and CO₂ corrosion is prevalent.
Marine Applications
Offshore platform components, riser systems, flowlines, and seawater handling equipment requiring exceptional resistance to chloride-induced stress corrosion cracking.
Chemical Processing
Reactor vessels, heat exchangers, valves, and piping systems handling aggressive acids, chlorides, and other corrosive media in high-temperature environments.
Power Generation
Gas turbine components, nuclear reactor parts, and geothermal energy systems where materials must withstand both high temperatures and corrosive conditions.
As a leading manufacturer, SHUNFU METAL has extensive experience supplying N07725 to the world’s top oilfield service companies. Our products are trusted in critical applications across North America, Europe, the Middle East, and Asia-Pacific regions.
Standards and Equivalent Grades
N07725 manufactured by SHUNFU METAL complies with multiple international standards, ensuring global acceptance and interchangeability. Our quality management system is ISO 9001 certified, guaranteeing consistent product quality for all bulk orders.
Primary Standards Compliance
| Standard Organization | Standard Number | Designation |
|---|---|---|
| API (American Petroleum Institute) | API 6ACRA | UNS N07725 / 120K |
| ASTM (American) | ASTM B637 | UNS N07725 |
| NACE (Corrosion Standards) | NACE MR0175 / ISO 15156 | Sour Service Approved |
| ISO (International) | ISO 15156-3 | Table A.29 Listed |
| DIN/EN (European) | DIN EN 10269 | 2.4856 (Similar) |
Related and Similar Alloy Grades
| Alloy Name | UNS Number | Key Difference |
|---|---|---|
| Alloy 625 | N06625 | Non-age hardenable, lower strength |
| Alloy 718 | N07718 | Lower Mo content, less corrosion resistance |
| Alloy 925 | N09925 | Lower Ni and Mo, different application range |
| Alloy C-276 | N10276 | Higher Mo, non-age hardenable |
Chemical Composition of N07725
The chemical composition of N07725 is carefully balanced to provide optimal corrosion resistance and mechanical properties after age hardening. SHUNFU METAL as a professional manufacturer ensures strict adherence to the specified composition ranges through advanced melting processes including VIM (Vacuum Induction Melting), VAR (Vacuum Arc Remelting), and AOD (Argon Oxygen Decarburization).
| Element | Content (wt%) | Function |
|---|---|---|
| Nickel (Ni) | 55.0 – 59.0 | Base element, corrosion resistance |
| Chromium (Cr) | 19.0 – 22.5 | Oxidation resistance, passivation |
| Molybdenum (Mo) | 7.00 – 9.50 | Pitting and crevice corrosion resistance |
| Niobium (Nb) | 2.75 – 4.00 | Precipitation hardening, strength |
| Titanium (Ti) | 1.00 – 1.70 | Age hardening, gamma prime formation |
| Iron (Fe) | Balance | Balance element |
| Aluminum (Al) | 0.35 max | Deoxidizer, gamma prime former |
| Carbon (C) | 0.030 max | Controlled for corrosion resistance |
| Manganese (Mn) | 0.35 max | Deoxidizer, workability |
| Silicon (Si) | 0.20 max | Deoxidizer |
| Phosphorus (P) | 0.015 max | Impurity (strictly controlled) |
| Sulfur (S) | 0.010 max | Impurity (strictly controlled) |
Note: Chemical composition per API 6ACRA specification. SHUNFU METAL can provide mill test certificates (MTC) with full chemical analysis for all products.
Available Sizes and Dimensions
SHUNFU METAL maintains comprehensive inventory of N07725 in various sizes and forms. As a direct manufacturer, we offer competitive pricing on bulk orders and can accommodate custom dimensional requirements to meet your specific project needs.
Forged Round Bars
Ø 80 – 1200 mm
Custom lengths available
Rolled Round Bars
Ø 10 – 300 mm
Standard and custom lengths
Additional Product Forms
| Product Form | Available Dimensions | Stock Status |
|---|---|---|
| Hollow Bars (Pre-bored) | OD 100-500mm, various ID options | In Stock |
| Plates and Sheets | Thickness 6-150mm, custom sizes | Made to Order |
| Forgings | Rings, discs, blocks per drawing | Made to Order |
| Pipes and Tubes | Seamless, various schedules | Made to Order |
📞 Contact SHUNFU METAL for Custom Sizes: Standard dimensions are maintained in stock for quick delivery. For special dimensions or large volume orders, please contact our sales team for quotation. We welcome bulk orders and can provide competitive pricing for high-volume requirements.
Heat Treatment Procedures for N07725
Proper heat treatment is critical to achieving the optimal combination of strength and corrosion resistance in N07725. SHUNFU METAL operates advanced heat treatment facilities capable of processing large batches while maintaining precise temperature control required for this precipitation-hardening alloy.
Solution Annealing
Temperature Range
1875°F – 1950°F
(1024°C – 1066°C)
Holding Time
0.5 to 4 Hours
Depending on section thickness
Cooling Method
Water Quench or Rapid Air Cool
To prevent precipitation
Age Hardening (Precipitation Hardening)
The age hardening treatment for N07725 120K grade follows a specific two-step process per API 6ACRA:
Step 1: Initial Aging
Temperature: 1325°F – 1425°F (718°C – 774°C)
Duration: 4 to 8 hours
Cooling: Furnace cool to Step 2 temperature
Step 2: Final Aging
Temperature: 1125°F – 1275°F (607°C – 691°C)
Duration: 12 hours minimum total aging time
Cooling: Air cool to room temperature
As a professional manufacturer, SHUNFU METAL provides complete heat treatment services in our own facilities. We can supply N07725 in solution annealed condition, fully age hardened condition, or perform custom heat treatment cycles per customer specifications.
Mechanical Properties of N07725 (120K Grade)
N07725 in the 120K condition delivers exceptional mechanical properties suitable for the most demanding oilfield applications. All products from SHUNFU METAL are tested in accordance with API 6ACRA requirements and supplied with complete mill test reports.
Tensile Requirements per API 6ACRA
| Cross-Section Thickness | 0.2% Yield Min. ksi (MPa) | 0.2% Yield Max. ksi (MPa) | Tensile Strength Min. ksi (MPa) | Elongation in 4D Min. % | Reduction of Area Min. % |
|---|---|---|---|---|---|
| ≤ 10 in. (254 mm) | 120 (827) | 150 (1034) | 150 (1034) | 20 | 35 |
| > 10 in. (254 mm) | 120 (827) | 150 (1034) | 150 (1034) | 20 | 25 |
Hardness Requirements
| Parameter | Minimum | Maximum |
|---|---|---|
| Hardness HRC (HBW) | 32 HRC | 43 HRC |
Charpy V-Notch Impact Toughness Requirements (10 mm × 10 mm)
| Cross-Section Thickness | Orientation | Min. Average ft-lbs (J) | Min. Single ft-lbs (J) | Min. Lateral Expansion in. (mm) |
|---|---|---|---|---|
| < 3 in. (76 mm) | Longitudinal | 40 (54) | 35 (47) | 0.015 (0.38) |
| ≥ 3 in. (76 mm) through 10 in. (254 mm) | Transverse | 37 (50) | 32 (43) | 0.015 (0.38) |
| > 10 in. (254 mm) | Transverse | 32 (43) | 27 (37) | 0.015 (0.38) |
Machining and Processing Capabilities
SHUNFU METAL provides comprehensive machining and processing services for N07725 products. Our state-of-the-art manufacturing facilities include advanced CNC equipment, BTA boring machines, and precision finishing capabilities to deliver ready-to-use components that meet your exact specifications.
Turning & OD Machining
Precision turning on CNC lathes, bright bar finishing, and tight tolerance OD grinding. Surface finish to Ra 1.6μm or better available upon request.
Boring & ID Machining
Deep hole BTA boring for hollow bars, honing for superior ID finish, and ID threading capabilities for specialized applications.
Threading Services
API connection threading, premium connections, and custom thread profiles. Both internal and external threading to API, ANSI, or proprietary specifications.
Surface Treatment
Shot peening for fatigue resistance, roller burnishing for surface hardening, and laser cladding services using our 6-axis machine center.
Melting Process Options
Per API 6ACRA requirements, SHUNFU METAL offers N07725 produced through two approved melting sequences:
Option A: EF + AOD/VOD + VAR
Step 1: Basic Electric Furnace (EF)
Step 2: AOD or VOD refining
Step 3: Vacuum Arc Remelting (VAR)
Optional Step 4: Double VAR
Option B: VIM + ESR/EFR + VAR
Step 1: Vacuum Induction Melting (VIM)
Optional Step 2: ESR or EFR
Step 3: Vacuum Arc Remelting (VAR)
Optional Step 4: Double VAR
Why Choose SHUNFU METAL for N07725?
Direct Manufacturer
As a direct manufacturer, we eliminate middlemen costs and provide competitive factory pricing. Our 8,000+ ton inventory and 20,000 m² warehouse ensure quick delivery for your projects.
Quality Assured
ISO 9001 certified quality management system. Every product undergoes rigorous testing in our fully-equipped metallurgical laboratory by experienced engineers.
Technical Expertise
Our team of 22 metallurgy and materials engineers provides professional technical support. We help customers select the right materials and specifications for their applications.
Global Experience
Trusted supplier to the world’s top 10 oilfield service companies. Exporting to 52+ countries across North America, Europe, Middle East, and Asia-Pacific.
Ready to Order N07725 from SHUNFU METAL?
Contact our sales team today for quotation on bulk orders. We welcome large volume requirements and offer competitive pricing for procurement professionals.
© 2024 Hunan ShunFu Metal Material Co., Ltd. | Professional Manufacturer of Oilfield Steel Products | ISO 9001 Certified | www.gaslinepipe.com
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.
