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Stellite 4 Cobalt Alloy Rod – Premium Quality from China
The Stellite 4 Cobalt Alloy Rod is a high-performance cobalt base alloy designed for exceptional wear and corrosion resistance. Known for its durability in extreme conditions, this Round Rod is ideal for industries requiring robust materials, such as aerospace, power generation, and oil and gas. Its unique cobalt alloy composition ensures long-lasting performance.
Price: Contact Us for a Custom Quote
For competitive pricing on Stellite 4 Cobalt Alloy Rod, contact our sales team. We offer tailored pricing terms for cobalt based alloys, including bulk discounts. Reach out to discuss your needs and receive a personalized quote for your project.
Specifications
- Diameter: 3 mm to 100 mm
- Length: Up to 3000 mm or custom-cut
- Surface Treatment: Polished, ground, or as-cast
- Standards: ASTM F1537, AMS 5759
- Forms:Â Round Bar, rod, or bar
- Tolerance: ±0.05 mm for precision applications
Key Features (Advantages)
- Outstanding Wear Resistance: Ideal for high-abrasion environments.
- Corrosion Resistance: Performs well in acidic and saline conditions.
- High-Temperature Stability: Retains strength up to 800°C.
- Versatility: Suitable for multiple industrial applications.
- Durability: Reduces maintenance costs due to long service life.
Applications of Stellite 4 Cobalt Alloy Rod
The Stellite 4 Cobalt Alloy Rod is widely used in demanding industries due to its robust cobalt alloy properties. Key applications include:
- Power Generation: Turbine blades and wear-resistant fittings.
- Oil and Gas: Drill bits, pump shafts, and downhole tools.
- Chemical Processing: Reactor components and corrosion-resistant fittings.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Cobalt (Co) | Balance |
| Chromium (Cr) | 28.0 - 32.0 |
| Tungsten (W) | 12.0 - 15.0 |
| Carbon (C) | 1.0 - 1.5 |
| Nickel (Ni) | 3.0 max |
| Iron (Fe) | 3.0 max |
| Silicon (Si) | 1.5 max |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 800 - 1000 MPa |
| Yield Strength (0.2% Offset) | 600 - 750 MPa |
| Elongation | 10 - 15% |
| Hardness (HRC) | 40 - 48 |
Chemical Properties
The Stellite 4 Cobalt Alloy Rod offers excellent resistance to corrosive environments, including:
- Acids: Resists sulfuric and phosphoric acids at moderate concentrations.
- Alkalis: Stable in sodium hydroxide and other alkaline solutions.
- Oxidation: Maintains integrity in high-temperature oxidizing atmospheres.
Environmental Restrictions: Avoid prolonged exposure to highly reducing environments or concentrated hydrochloric acid, which may cause pitting.
Things to Note (Limitations)
Despite its strengths, the Stellite 4 Cobalt Alloy Rod has some limitations:
- High Hardness: Difficult to machine, requiring specialized tools.
- Cost: Higher cobalt alloy price compared to stainless steel or other alloys.
- Brittleness: May crack under extreme mechanical shock or rapid cooling.
Corrosion Data for Stellite 4 Cobalt Alloy Rod
| Environment | Corrosion Rate (mm/year) |
|---|---|
| Atmospheric (Industrial) | <0.01 |
| Seawater (Flowing) | 0.02 - 0.05 |
| 10% Sulfuric Acid | 0.1 - 0.4 |
| 5% Phosphoric Acid | 0.05 - 0.2 |
Best Welding and Manufacturing Practices
The Stellite 4 Cobalt Alloy Rod supports various fabrication methods. Recommended techniques include:
- Welding: Plasma arc welding (PAW) or TIG (GTAW) with Stellite filler material.
- Forming: Hot forging at 950°C – 1150°C; cold working is limited due to high hardness.
- Machining: Use carbide tools with low speeds and high feed rates.
Tip: Pre-heat to 200°C before welding to minimize cracking, and ensure proper ventilation due to cobalt fumes.
What Customers Say About
Frequently Asked Questions
Q: How does Stellite 4 differ from other Stellite alloys?
A: Stellite 4 has a balanced cobalt alloy composition with higher tungsten content, offering superior wear resistance compared to Stellite 6, but less ductility.
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Q: What are the main cobalt alloy uses for Stellite 4?
A: It’s used in aerospace, oil and gas, power generation, and chemical processing for wear- and corrosion-resistant components.
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Q: Can Stellite 4 Cobalt Alloy Rod be machined easily?
A: Due to its high hardness, machining requires carbide tools and slow speeds, but it’s achievable with proper equipment.
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Q: How does Stellite 4 compare to stainless steel?
A: Stellite 4Â offers better wear and corrosion resistance in extreme conditions but is more expensive and harder to machine.
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Q: What sizes are available for Stellite 4 Cobalt Alloy Rod?
A: Diameters range from 3 mm to 100 mm, with lengths up to 3000 mm or custom-cut.
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Q: Is Stellite 4 environmentally friendly?
A: It’s recyclable and durable, minimizing waste, but cobalt dust from machining requires proper handling to avoid environmental impact.