Project Description
N09945 (125K) Nickel Alloy Steel – Premium Corrosion Resistant Alloy from SHUNFU METAL
High-Performance Precipitation-Hardenable Nickel-Chromium-Molybdenum-Niobium Alloy for Demanding Oilfield Applications
Introduction to UNS N09945 (125K) Alloy
UNS N09945, commonly designated as 125K, is a premium precipitation-hardenable nickel-chromium-molybdenum-niobium alloy engineered specifically for the most demanding applications in the oil and gas industry. As a leading manufacturer of high-performance alloy materials, SHUNFU METAL is proud to offer this exceptional corrosion-resistant alloy (CRA) material that combines outstanding mechanical strength with superior resistance to aggressive corrosive environments.
This nickel-based superalloy contains approximately 46.5% to 48.0% nickel, combined with substantial chromium (19.5% to 23.0%), molybdenum (3.0% to 4.0%), and niobium (2.80% to 3.50%) additions. This carefully balanced chemical composition provides the N09945 alloy with its remarkable combination of high strength, excellent corrosion resistance, and reliable performance in sour gas environments containing hydrogen sulfide (H₂S) and carbon dioxide (CO₂).
The 125K designation refers to the minimum 0.2% offset yield strength of 125 ksi (862 MPa), which positions this alloy as one of the highest-strength CRA materials available for downhole and subsea applications. At SHUNFU METAL, we manufacture N09945 alloy products using state-of-the-art melting processes including Vacuum Induction Melting (VIM), Electroslag Remelting (ESR), and Vacuum Arc Remelting (VAR) to ensure the highest metallurgical quality and consistency.
Key Features and Advantages
Exceptional Strength
Minimum yield strength of 125 ksi (862 MPa) with tensile strength reaching 150 ksi (1034 MPa), providing reliable performance under extreme pressure conditions in deep well and high-pressure applications.
Superior Corrosion Resistance
Outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-containing environments, making it ideal for sour service and offshore applications.
Precipitation Hardening
Age-hardenable alloy that achieves high strength through controlled precipitation of gamma prime (γ’) and gamma double prime (γ”) phases during heat treatment.
Excellent Toughness
Maintains excellent impact toughness even at the high strength levels, with Charpy V-notch values meeting stringent industry requirements for critical applications.
Applications and Uses of N09945 Alloy
As a professional manufacturer of corrosion-resistant alloy materials, SHUNFU METAL supplies N09945 (125K) alloy for a wide range of critical applications across multiple industries. The unique combination of high strength and corrosion resistance makes this alloy particularly valuable in environments where conventional stainless steels and lower-grade nickel alloys cannot provide adequate performance.
Oil and Gas Industry Applications
Downhole Equipment
Production tubing, completion equipment, packers, and safety valves for HPHT (High Pressure High Temperature) wells and sour gas reservoirs.
Subsea Systems
Subsea wellhead components, tree equipment, manifolds, and flowline connectors for deepwater production systems.
Drilling Components
MWD/LWD tools, drilling jars, stabilizers, and other drilling accessories requiring high strength and corrosion resistance.
Production Equipment
Valve bodies, pump components, hangers, and other critical production equipment exposed to corrosive well fluids.
Other Industrial Applications
Beyond the oil and gas sector, N09945 alloy finds applications in chemical processing equipment, marine engineering components, power generation systems, and aerospace applications where high strength combined with corrosion resistance is essential. The alloy’s resistance to chloride-induced stress corrosion cracking makes it particularly valuable in marine and coastal environments.
Standards and Specifications
SHUNFU METAL manufactures N09945 alloy products in strict compliance with international standards and customer specifications. Our quality management system ensures full traceability and documentation for all materials supplied.
Applicable Standards
| Standard Organization | Specification | Description |
|---|---|---|
| UNS | N09945 | Unified Numbering System designation |
| API | API 6ACRA | Age-Hardened Nickel-Based Alloys for Oil and Gas Drilling and Production Equipment |
| NACE | MR0175/ISO 15156 | Petroleum and natural gas industries — Materials for use in H₂S-containing environments |
| ASTM | B637 | Precipitation-Hardening and Cold Worked Nickel Alloy Bars, Forgings, and Forging Stock |
Related and Equivalent Grades
N09945 belongs to the family of precipitation-hardenable nickel alloys. While each alloy has its unique composition and properties, the following grades share similar characteristics or applications:
| UNS Number | Common Name | Similar Characteristics |
|---|---|---|
| N07718 | Alloy 718 | Precipitation-hardenable Ni-Cr-Fe alloy with Nb and Mo additions |
| N07725 | Alloy 725 | Higher Mo content for enhanced corrosion resistance |
| N09925 | Alloy 925 | Age-hardenable Ni-Fe-Cr alloy with Ti and Al additions |
| N06625 | Alloy 625 | Solid-solution strengthened Ni-Cr-Mo-Nb alloy |
Chemical Composition of N09945
The chemical composition of UNS N09945 is carefully controlled to achieve the optimal balance of strength, corrosion resistance, and fabricability. SHUNFU METAL ensures strict adherence to these composition requirements through advanced melting practices and rigorous quality control.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 46.5 – 48.0 |
| Chromium (Cr) | 19.5 – 23.0 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 3.00 – 4.00 |
| Niobium (Nb) | 2.80 – 3.50 |
| Titanium (Ti) | 0.50 – 2.50 |
| Copper (Cu) | 1.50 – 3.00 |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 0.50 max |
| Aluminum (Al) | 0.01 – 0.70 |
| Carbon (C) | 0.005 – 0.040 |
| Phosphorus (P) | 0.020 max |
| Sulfur (S) | 0.010 max |
Note: Iron content is calculated as the balance to achieve 100% composition. All values in weight percentage.
Available Sizes and Product Forms
As a dedicated manufacturer of premium alloy steel products, SHUNFU METAL offers N09945 (125K) alloy in a comprehensive range of sizes and product forms to meet diverse application requirements. Our extensive inventory ensures quick delivery for standard sizes, while our advanced manufacturing capabilities allow us to produce custom dimensions for specialized projects.
Forged Round Bars
Diameter Range: 80mm – 1200mm
Produced through open-die forging with controlled reduction ratios to ensure optimal grain structure and mechanical properties.
Rolled Round Bars
Diameter Range: 10mm – 300mm
Hot rolled bars with excellent surface finish and dimensional accuracy for machining applications.
Additional Product Forms
In addition to round bars, SHUNFU METAL can supply N09945 alloy in various other product forms including:
- Hollow bars and tubes (pre-drilled for machining efficiency)
- Square and rectangular bars
- Forged blocks and slabs
- Custom forgings and near-net-shape products
Stock Availability: Common sizes are available from stock for immediate delivery. We maintain over 8,000 tons of inventory across 250+ steel grades. For specific size requirements or large volume orders, please contact our sales team for availability and lead times. Custom dimensions are welcome!
Heat Treatment Procedures
N09945 (125K) is a precipitation-hardenable alloy that achieves its high strength through a carefully controlled heat treatment process consisting of solution annealing followed by age hardening. SHUNFU METAL operates advanced heat treatment facilities to ensure precise temperature control and uniform properties throughout the product.
Manufacturing Process Sequences
One of the following melting and remelting sequences shall be utilized to produce N09945 alloy:
Process Route A (EF + Refining + Remelting)
Step 1: Basic Electric Furnace (EF)
Step 2: AOD, VOD, or Vacuum Degassing
Step 3: ESR, EFR, or VAR
Optional Step 4: VAR (Vacuum Arc Remelting)
Process Route B (VIM + Remelting)
Step 1: Vacuum Induction Melting (VIM)
Step 2: ESR, EFR, or VAR
Optional Step 3: VAR (Vacuum Arc Remelting)
Heat Treatment Parameters
| Treatment Stage | Temperature | Time |
|---|---|---|
| Solution Annealing | 1800°F – 1950°F (982°C – 1066°C) | 0.5 to 4 hours |
| Age Hardening – Step 1 | 1250°F – 1350°F (677°C – 732°C) | 4 – 8 hours |
| Age Hardening – Step 2 | 1110°F – 1190°F (599°C – 643°C) | 12 hours minimum (total aging time) |
Note: After solution annealing, furnace cool to the age hardening temperature. The two-step aging process optimizes the precipitation of strengthening phases.
Mechanical Properties
The N09945 (125K) alloy exhibits exceptional mechanical properties after proper heat treatment. SHUNFU METAL guarantees all products meet or exceed the minimum requirements specified in applicable standards.
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) | 125 ksi (862 MPa) | 155 ksi (1069 MPa) | 150 ksi (1034 MPa) | 18% | 25% |
| >10 in. (254 mm) | 125 ksi (862 MPa) | 155 ksi (1069 MPa) | 150 ksi (1034 MPa) | 18% | 20% |
Charpy V-Notch Impact Toughness
| Cross-Section Thickness | Orientation | Average Min. ft-lbs (J) | Single Min. ft-lbs (J) | Lateral Expansion Min. (mm) |
|---|---|---|---|---|
| <3 in. (76 mm) | Longitudinal | 50 (68) | 45 (61) | 0.015 (0.38) |
| ≥3 in. through 10 in. (76-254 mm) | Transverse | 40 (54) | 35 (47) | 0.015 (0.38) |
| >10 in. (254 mm) | Transverse | 30 (41) | 27 (37) | 0.015 (0.38) |
Test specimen size: 10 mm x 10 mm full-size Charpy V-notch specimens
Hardness Requirements
| Material Designation | Minimum Hardness HRC (HBW) | Maximum Hardness HRC (HBW) |
|---|---|---|
| 125K (N09945) | 32 HRC | 42 HRC |
Machining and Processing Services
As a comprehensive manufacturer and processor of specialty alloy materials, SHUNFU METAL offers a complete range of machining and processing services for N09945 (125K) alloy products. Our advanced machining capabilities enable us to deliver semi-finished or finished components that reduce your production time and costs.
Turning and Machining
Precision CNC turning and machining services to achieve tight dimensional tolerances and superior surface finishes. We utilize advanced cutting tools designed specifically for nickel-based superalloys.
Boring and Drilling
Deep hole drilling and BTA boring capabilities for producing hollow bars and tubular components. Our long-distance gun drilling equipment can handle lengths up to several meters.
Threading
API and premium connection threading services for oilfield tubular products. We can machine internal and external threads to various specifications including custom thread profiles.
Surface Treatment
Roller burnishing and shot peening services to enhance surface finish and fatigue resistance. These processes are essential for critical applications requiring extended service life.
Machining Guidelines for N09945
N09945 is a precipitation-hardened nickel alloy that requires careful attention during machining operations. Key considerations include:
- Cutting Tools: Use positive rake angle tools with sharp cutting edges. Carbide or ceramic tools are recommended for optimal performance.
- Cutting Speeds: Moderate cutting speeds with adequate coolant flow to prevent work hardening and excessive tool wear.
- Feed Rates: Maintain consistent, positive feed rates to avoid dwelling which can cause work hardening of the machined surface.
- Coolant: High-pressure coolant delivery is recommended to remove chips efficiently and maintain cutting temperature control.
Why Choose SHUNFU METAL for N09945 Alloy?
Direct Manufacturer
As a direct manufacturer, SHUNFU METAL offers competitive factory pricing for bulk orders. We eliminate intermediaries to provide the best value for your procurement budget.
Quality Assurance
ISO 9001 certified quality management system with full material traceability. Our in-house laboratory provides comprehensive testing including mechanical, chemical, and NDT inspection.
Technical Expertise
Our team of 22 metallurgy and materials engineers provides expert technical support for material selection, heat treatment optimization, and application engineering.
Global Service
Serving customers in over 52 countries, we understand international standards and documentation requirements. We are a trusted supplier to the world’s top 10 oilfield service companies.
Request a Quote for N09945 (125K) Alloy
Whether you need standard stock sizes or custom dimensions, SHUNFU METAL is ready to support your N09945 alloy requirements. We welcome bulk orders and offer competitive pricing for large volume purchases.
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