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Stellite31 Cobalt Alloy Pipe – Advanced Cobalt Alloy Steel from China
Stellite31 Cobalt Alloy Pipe, a high-performance chromium cobalt nickel alloy, is engineered for superior corrosion resistance, high-temperature stability, and durability. Produced by our trusted China factory, this cobalt alloy steel excels in demanding industrial applications, leveraging its optimized cobalt alloy composition for exceptional performance.
Price: Contact Us for a Custom Quote
For competitive pricing on Stellite31 Cobalt Alloy Pipe, contact our sales team via our website or customer service portal. Pricing is tailored based on specifications, order volume, and delivery terms. Reach out to our China-based manufacturer for a customized quote.
Specifications
- Outer Diameter: 8 mm to 200 mm
- Wall Thickness: 1 mm to 15 mm
- Length: Up to 6 meters (custom lengths available)
- Surface Treatment: Polished, annealed, or per customer requirements
- Standards: ASTM, ASME, or customized specifications
- Finish: Seamless or welded options
Key Features (Advantages)
- Superior Corrosion Resistance: Withstands harsh chemical and environmental conditions.
- High-Temperature Performance: Stable up to 1200°C, ideal for extreme heat.
- Excellent Wear Resistance: Durable in abrasive environments, extending service life.
- Customizable Specifications: Tailored dimensions and finishes from our China factory.
- Cost-Effective Longevity: Reduces maintenance costs due to robust cobalt alloy properties.
Applications of Stellite31 Cobalt Alloy Pipe
The Stellite31 Cobalt Alloy Pipe supports a wide range of cobalt alloy uses across industries, including:
- Aerospace: High-temperature components like turbine blades and exhaust systems.
- Power Generation: Boiler and heat exchanger piping for extreme conditions.
- Chemical Processing: Handling corrosive acids and alkalis.
- Oil and Gas: Piping for high-pressure, corrosive fluids.
- Marine Engineering: Resistant to seawater corrosion for offshore applications.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Cobalt (Co) | Balance (approx. 50-55%) |
| Chromium (Cr) | 24-26% |
| Nickel (Ni) | 10-12% |
| Tungsten (W) | 7-8% |
| Carbon (C) | 0.45-0.55% |
| Iron (Fe) | ≤2% |
| Others | ≤1% (Si, Mn, Mo) |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 850-1000 MPa |
| Yield Strength | 550-700 MPa |
| Elongation | 15-25% |
| Hardness (HRC) | 30-36 |
| Density | 8.5 g/cm³ |
Chemical Properties
The cobalt alloy properties of Stellite31 ensure excellent resistance to acids (e.g., sulfuric, hydrochloric) and alkalis, making it ideal for corrosive environments. It performs well in mildly oxidizing conditions but may require monitoring in highly oxidizing acids like nitric acid. Stellite31 Cobalt Alloy Pipe complies with environmental regulations, with recycling recommended due to cobalt’s scarcity.
Things to Note (Limitations)
- High-Temperature Oxidation: May oxidize above 1200°C, reducing lifespan.
- Moderate Brittleness: Higher nickel content improves ductility but may crack under extreme stress.
- Cost Factor: Higher cobalt alloy price compared to standard stainless steel.
- Machining Challenges: Hardness requires specialized tools for cutting and forming.
Corrosion Data for Stellite31 Cobalt Alloy Pipe
| Environment | Corrosion Rate (mm/year) |
|---|---|
| Atmospheric (Urban) | <0.01 |
| Seawater | 0.01-0.05 |
| 10% Sulfuric Acid | 0.05-0.1 |
| 10% Hydrochloric Acid | 0.07-0.12 |
Best Welding and Manufacturing Practices
Stellite31 Cobalt Alloy Pipe supports welding methods like TIG (Tungsten Inert Gas) and plasma arc welding for strong, reliable joints. Preheating to 150-250°C is advised to prevent cracking. Fabrication techniques include:
- Cutting: Use carbide or diamond tools due to high hardness.
- Forming: Hot forming at 950-1100°C for optimal results.
- Machining: Requires high-speed tools with coolant to manage heat.
What Customers Say About
Frequently Asked Questions
Q: How does Stellite31 differ from other Stellite alloys?
A: Stellite31 has higher nickel content than Stellite 4 or 8, improving ductility while maintaining corrosion resistance.
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Q: What industries benefit from Stellite31 Cobalt Alloy Pipe?
A: Aerospace, power generation, chemical processing, oil and gas, and marine industries rely on its robust properties.
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Q: Is it suitable for high-temperature applications?
A: Yes, it performs well up to 1200°C, but oxidation risks increase beyond this threshold.
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Q: Does Stellite31 meet environmental standards?
A: Yes, it complies with global regulations; recycling is recommended due to cobalt scarcity.
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Q: What welding methods are best for Stellite31?
A: TIG and plasma arc welding are recommended for strong, reliable welds.