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3J21 Cobalt Based Alloy Rod – High-Performance Alloy From China Top Manufacturers
The 3J21 Cobalt Based Alloy Rod is a precision-engineered cobalt base alloy known for its high strength, excellent elasticity, and corrosion resistance. Designed for demanding applications, this Round Rod is ideal for industries such as aerospace, medical, and precision instrumentation. Its unique cobalt alloy composition ensures superior performance in challenging environments.
Price: Contact Us for a Custom Quote
For competitive pricing on 3J21 Cobalt Based Alloy Rod, contact our sales team. We offer flexible pricing terms for cobalt based alloys, including bulk discounts. Reach out to discuss your needs and receive a tailored quote for cobalt alloy price.
Specifications
- Diameter: 1 mm to 50 mm
- Length: Up to 2000 mm or custom-cut
- Surface Treatment: Polished, ground, or bright finish
- Standards: GB/T 14989, ASTM equivalent where applicable
- Forms:Â Round Bar, rod, or wire
- Tolerance: ±0.02 mm for high-precision applications
Key Features (Advantages)
- High Elasticity: Maintains shape under cyclic stress.
- Corrosion Resistance: Resists degradation in harsh environments.
- High Strength: Exceptional tensile and yield strength for demanding applications.
- Fatigue Resistance: Ideal for cobalt alloy uses in dynamic systems.
- Precision Fabrication: Supports tight tolerances for intricate components.
Applications of 3J21 Cobalt Based Alloy Rod
The 3J21 Cobalt Based Alloy Rod is a versatile cobalt chrome material used in industries requiring high precision and durability. Key applications include:
- Aerospace: Springs, fasteners, and sensor components.
- Medical Devices: Surgical instruments and implantable components.
- Precision Instrumentation: Elastic elements in gauges and meters.
- Electronics: Connectors and high-reliability springs.
- Automotive: High-performance engine components.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Cobalt (Co) | Balance |
| Nickel (Ni) | 14.0 - 16.0 |
| Chromium (Cr) | 19.0 - 21.0 |
| Molybdenum (Mo) | 6.0 - 8.0 |
| Manganese (Mn) | 1.0 - 2.0 |
| Carbon (C) | 0.1 max |
| Silicon (Si) | 0.4 max |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 1300 - 1800 MPa |
| Yield Strength (0.2% Offset) | 900 - 1200 MPa |
| Elongation | 5 - 10% |
| Hardness (HRC) | 35 - 45 |
Chemical Properties
The 3J21 Cobalt Based Alloy Rod offers robust resistance to corrosive environments, including:
- Acids: Resists dilute sulfuric and hydrochloric acids.
- Alkalis: Stable in alkaline solutions like sodium hydroxide.
- Atmospheric Corrosion: Excellent resistance to humidity and industrial atmospheres.
Environmental Restrictions: Avoid prolonged exposure to concentrated oxidizing acids, such as nitric acid, which may cause surface degradation.
Things to Note (Limitations)
While highly effective, the 3J21 Cobalt Based Alloy Rod has some limitations:
- High Temperatures: Loses some elasticity above 600°C, limiting use in extreme heat.
- Cost: Higher cobalt alloy price compared to standard alloys like stainless steel.
- Brittleness: May exhibit reduced ductility in heavily cold-worked conditions.
Corrosion Data for 3J21 Cobalt Based Alloy Rod
| Environment | Corrosion Rate (mm/year) |
|---|---|
| Atmospheric (Urban) | <0.01 |
| Seawater (Static) | 0.01 - 0.03 |
| 5% Sulfuric Acid | 0.05 - 0.2 |
| 5% Hydrochloric Acid | 0.1 - 0.3 |
Best Welding and Manufacturing Practices
The 3J21 Cobalt Based Alloy Rod supports various fabrication methods, with the following recommendations:
- Welding: TIG (GTAW) or laser welding with compatible cobalt-based filler materials.
- Forming: Cold working is preferred for precision components; hot working possible at 1000°C – 1150°C.
- Machining: Use carbide tools with low speeds and high feed rates for best results.
Tip: Pre-clean surfaces thoroughly before welding to prevent contamination, and use post-weld heat treatment to relieve stresses.
What Customers Say About
Frequently Asked Questions
Q: How does 3J21 differ from other cobalt-based alloys?
A: 3J21 is optimized for high elasticity and fatigue resistance, unlike other cobalt based alloys like Stellite, which prioritize wear resistance.
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Q: What are the primary cobalt alloy uses for 3J21?
A: It’s used in aerospace, medical devices, precision instrumentation, electronics, and automotive for elastic and high-strength components.
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Q: Is 3J21 Cobalt Based Alloy Rod easy to weld?
A: Yes, it supports TIG and laser welding with proper filler materials and surface preparation.
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Q: How does 3J21 compare to stainless steel?
A: 3J21Â offers superior elasticity and corrosion resistance but is more expensive and requires specialized machining.
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Q: What sizes are available for 3J21 Cobalt Based Alloy Rod?
A: Diameters range from 1 mm to 50 mm, with lengths up to 2000 mm or custom-cut.
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Q: Is 3J21 environmentally friendly?
A: It’s recyclable and durable, reducing replacement needs, but cobalt machining dust requires careful handling to minimize environmental impact.