Precision 3J21 Cobalt-based Elastic Alloy Coil, please note that the above table provides a range of standard thicknesses, widths, and lengths for Precision Alloy.
- Dimensions:
- Thickness: 0.5mm – 50mm
- Width: >600mm
- Certification: ISO, SGS, BV and so on.
- *Customized size needs to be confirmed with us
- Grades: 1J22 soft magnetic alloy, 1J50 soft magnetic alloy, 1J79 Permalloy, 1J85 Permalloy, 4J32(Super-Invar), 4J36, 4J29 Kovar alloy, 4J42Kovar alloy, Cobalt-based elastic alloy 3J21.
Precision 3J21 Cobalt-based Elastic Alloy Size And Specifications
Precision 3J21 is a high-performance cobalt-based elastic alloy designed for applications requiring exceptional elasticity, corrosion resistance, and thermal stability. It is a precipitation-hardened iron-nickel-cobalt (Fe-Ni-Co) alloy with controlled additions of titanium (Ti), aluminum (Al), and other elements to enhance mechanical properties.
This alloy is particularly suited for precision components in aerospace, automotive, medical, and nuclear industries where reliability under extreme conditions is critical. Huaxiao Metal Manufacturer is the professional and experienced in processing alloy in China.
Huaxiao Metal Supplier provides all sizes of Precision alloy coil for sale. Customized specifications are available upon request. Additionally, the exact chemical composition and mechanical properties may vary slightly within the ranges listed, depending on the specific alloy formulation and production process. Custom sizes are also available upon request. Welcome to inquire, and learn about more details about the alloy coil.
- Form Availability: Coil, wire, strip, and custom-rolled shapes.
- Standard Sizes: Thickness 0.05–2.0 mm (strip), diameter 0.1–5.0 mm (wire).
- Manufacturing Standards: Produced via vacuum induction melting (VIM) + electroslag remelting (ESR) for ultra-low oxygen/nitrogen content (<25 ppm O₂, <40 ppm N₂).
- Heat Treatments: Solution-treated at 1100°C, aged at 700–600°C for optimal strength.
Chemical Composition of 3J21 Cobalt-based Elastic Alloy Coil
| Element | Weight % | Role |
|---|---|---|
| Ni | 40–43 | Stabilizes austenite matrix, controls thermal expansion. |
| Co | 10–13 | Enhances high-temperature creep resistance and elastic modulus. |
| Ti | 2.2–2.9 | Forms Ni₃Ti precipitates for aging hardening. |
| Al | 0.6–1.0 | Optimizes precipitate distribution, inhibits grain coarsening. |
| Fe | Balance | Base element for structural integrity. |
| C, S, P | ≤0.03, ≤0.008, ≤0.008 | Controlled impurities to ensure toughness. |
Physical Properties of 3J21 Cobalt-based Elastic Alloy Coil
| Property | 3J21 Value | Units | Comparative Advantage |
|---|---|---|---|
| Density | 8.2–8.4 | g/cm³ | Lighter than Inconel X-750 (8.28 g/cm³). |
| Thermal Expansion (20–200°C) | 12×10⁻⁶ | /°C | Matches ceramic sealing materials. |
| Resistivity | 85–95 | μΩ·cm | Reduces eddy current losses in sensors. |
| Thermal Conductivity | 15–18 | W/(m·K) | Efficient heat dissipation in high-temperature applications. |
Analysis:
Moderate CTE ensures dimensional stability in thermal cycling.
Low thermal conductivity makes it suitable for precision instruments.
Mechanical Properties of 3J21 Cobalt-based Elastic Alloy Coil
| Condition | Elastic Modulus | Yield Strength | Tensile Strength | Elongation | Fatigue Limit (10⁷ cycles) |
|---|---|---|---|---|---|
| Annealed | 195–215 | 800–1000 | 1000–1200 | 25–35% | 450 MPa |
| Aged | >215 | ≥1300 | 1400–1600 | 8–12% | ≥550 MPa |
Stress-Strain Comparison at 300°C:
- 3J21: Retains >95% elastic modulus vs. room temperature.
- Beryllium Copper: Modulus drops by 40% at 200°C.
Please note that the above specifications are typical and may vary slightly based on the manufacturer, production batch, and specific application requirements. For precise specifications and availability, it is recommended to consult with a supplier or manufacturer of Precision alloy coils. Huaxiao Metal Manufacturer also provides other shapes of Precision products, such as bar, sheet&plate, strip, tube&pipe, wire&mesh. The price is affordable and suitable.
What are the 3J21 Cobalt-based Elastic Alloy Coil Benefits?
Precision 3J21 Cobalt-based Elastic Alloy Coil, also known as Kovar alloy, is a specialized low-expansion iron-nickel-cobalt alloy designed for applications requiring extreme dimensional stability across a wide temperature range. Its unique combination of low thermal expansion, corrosion resistance, and good machinability makes it an ideal choice for various high-precision industries. These benefits make them a suitable choice for a wide range of demanding applications across different industries. Welcome to Huaxiao Metal Manufacturer to request the price, trust you can be satisfied in the alloy products and buy our products quickly, cooperate with us in trading Kovar Alloy coil 4J36 or other products.
Precision 3J21 Cobalt-based Elastic Alloy Coil Applications and Uses
Huaxiao Metal Supplier provides all kinds of precision alloy coil in the world. Welcome to inquiry and ask for the price.
- Aerospace & Defense
- Engine Components: Used in aircraft engine fuel regulator diaphragms and satellite solar panel deployment hinges due to its high elasticity and fatigue resistance under extreme temperatures (-150°C to +400°C).
- Thermal Control Systems: Manufactures bellows for spacecraft thermal regulation, ensuring stable performance in radiation-intensive environments.
- Precision Accelerometers: Employed in high-accuracy accelerometer springs for navigation systems, leveraging its low magnetic permeability to avoid interference.
- Nuclear Engineering
- Reactor Control Rods: Acts as the elastic drive band for nuclear reactor control rods, combining radiation resistance with high-temperature stability (up to 400°C short-term).
- Fuel Cell Seals: Used in bipolar plate sealing springs for fuel cells, where corrosion resistance in acidic electrolytes is critical.
- Automotive High-Stress Parts
- Engine/Transmission Systems: Enhances durability in valve springs and clutch plates, with fatigue strength >550 MPa at 10⁷ cycles.
- Exhaust Components: Manufactures flexible couplings for exhaust systems, resisting thermal cycling and vibration.
- Medical Devices
- Implantable Components: Used in stent delivery systems and catheter guidewires, benefiting from biocompatibility and non-magnetic properties.
- Micro-Pumps: Precision springs for miniature drug delivery devices, ensuring reliability in corrosive bodily fluids.
- Electronics & Sensors
- Semiconductor Packaging: Stress-buffer strips in lead frames, matching ceramic thermal expansion (CTE: 12×10⁻⁶/°C) to prevent delamination.
- Ultrasonic Transducers: Bonding ribbons for piezoelectric elements in high-frequency probes, maintaining elastic recovery after repeated compression.
| Industry | Application | Performance Metric |
|---|---|---|
| Aerospace | Engine fuel regulator diaphragms | 10⁸ cycle fatigue life at 300°C. |
| Medical | MRI scanner flexures | Non-magnetic (<0.5 Gauss deflection). |
| Automotive | Exhaust gas recirculation (EGR) valve springs | 50% weight reduction vs. Inconel. |
| Nuclear | Reactor control rod drive bands | Radiation-resistant to 10⁶ Rads. |
Precision 3J21 Cobalt-based Elastic Alloy Coil Advantages
- Superior Elasticity: Recovery rate >99% after deformation, ideal for springs and diaphragms.
- Corrosion Resistance: Stable in neutral/weak acid environments (pH 4–10).
- Thermal Stability: Operational range -150°C to +400°C (short-term).
- Non-Magnetic: Magnetic permeability <1.05, suitable for MRI-sensitive applications.
- Cost-Effective Lifespan: 10× longer fatigue life than phosphor bronze in aerospace actuators.
Tips for Procurement and Cost-Effectiveness
- Supplier Selection: Prioritize certifications (AMS 5844, ASTM A338) and traceability.
- Inventory Management: Bulk purchases reduce cost by 12–15% due to economies of scale.
- Lifecycle Costing: While initial cost is 30% higher than stainless steel, maintenance savings over 10 years offset this.
Cost Breakdown:
- Raw Materials: Cobalt (45% of cost), Nickel (30%).
- Processing: Heat treatment (20%), cold rolling (15%).
Alloy Procurement and Pricing Insights
- Market Trends: Cobalt prices (LME) influence pricing; hedging strategies advised.
- Lead Times: 8–12 weeks for custom sizes; stock items available within 2 weeks.
- Price Range: 120/kg (FOB USA), depending on volume and heat treatment.
Historical Pricing Analysis:
- Q4 2024: $95/kg (base price).
- Q1 2025: +5% due to cobalt mining supply chain disruptions.
3J21 Cobalt-based Elastic Alloy Coil Factory
Huaxiao Metal Supplier provides professional services and reasonable prices, offering customers the best quality products. The Precision Alloy Coil Alloy Factory is a specialized manufacturing facility dedicated to the production of high-quality precision alloy coils. This factory combines advanced technology, rigorous quality control, and experienced personnel to ensure the production of precision alloy coils that meet the highest standards.The factory is equipped with state-of-the-art production equipment and machinery, capable of producing precision alloy coils with precise dimensions and consistent quality. Welcome to require, and ask to the price.
The Precision 3J21 Cobalt-Based Elastic Alloy Coil is a high-performance spring and elastic component material known for its exceptional fatigue resistance, high elasticity, and corrosion resistance. This alloy is widely used in precision instruments, aerospace mechanisms, and medical devices where long-term mechanical stability is critical.
Key Features:
Ultra-high elastic limit (up to 1000 MPa)
Excellent fatigue resistance (>10⁷ cycles at high stress)
Outstanding corrosion resistance (superior to stainless steel)
Controlled thermal expansion for precision applications
Optimized for cold forming and coil manufacturing
Comparison with Competing Alloys:
| Alloy | Type | Key Strengths |
|---|---|---|
| 3J21 | Co-Ni-Cr-Mo | Best fatigue resistance, high elasticity |
| 17-7PH (SS) | Cr-Ni-Al | Good corrosion resistance, lower cost |
| Elgiloy (Co-Cr-Ni) | Co-based | High corrosion resistance, medical-grade |
Analysis:
3J21 outperforms 17-7PH stainless steel in fatigue life and elasticity.
More cost-effective than Elgiloy for industrial spring applications.
Recommendation:
For high-performance springs, 3J21 is more cost-effective than Elgiloy.
For budget-sensitive projects, 17-7PH may suffice but with shorter lifespan.
In Conclusion
The Precision 3J21 Cobalt-Based Elastic Coil Alloy is a high-performance, fatigue-resistant material that outperforms stainless steel and competes with premium alloys like Elgiloy at a lower cost. Its exceptional elasticity, corrosion resistance, and long fatigue life make it ideal for aerospace, medical, and precision engineering applications.
Final Recommendations:
For critical fatigue applications (e.g., aerospace springs), 3J21 is the best choice.
For medical-grade needs, Elgiloy may be preferred despite higher cost.
Always verify supplier certifications and request mechanical test data.
Precision 3J21 cobalt-based elastic alloy offers an unparalleled combination of elasticity, corrosion resistance, and thermal stability for mission-critical applications. While initial investment is higher than conventional materials, its long-term durability and performance in extreme environments make it a cost-effective solution. As advancements in nanocrystalline processing and composite technologies emerge, 3J21 is poised to dominate next-generation precision engineering applications.