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Haynes 188 Cobalt Alloy Rod – Trusted Manufacturer in China
The Haynes 188 Cobalt Alloy Rod is a premium heat-resistant alloy designed for demanding industrial applications. Known for its exceptional high-temperature strength and outstanding oxidation resistance, this alloy delivers reliable performance in challenging environments. It is ideally suited for industries like aerospace and chemical processing, where durability and efficiency are critical.
Price: Contact Us for a Custom Quote
For pricing on Haynes 188 Cobalt Alloy Rod, contact our sales team for a tailored quote. Costs vary based on specifications, quantity, and customization needs.
Specifications
- Diameter: 0.5–100 mm
- Length: Up to 6 meters (custom lengths available)
- Surface Finish: Polished, ground, or as-rolled
- Tolerance: ±0.05 mm (standard), tighter tolerances on request
- Standards: AMS 5772, UNS R30188
Key Features (Advantages)
- High-Temperature Strength: Maintains exceptional strength and stability up to 2000°F (1093°C), outperforming many cobalt alloys.
- Superior Oxidation Resistance: Resists oxidation and sulfidation in extreme environments, extending component lifespan.
- Enhanced Weldability: Easier to weld than Haynes 25, enabling complex fabrications with minimal defects.
- Excellent Creep Resistance: High creep and rupture strength ensure reliability under prolonged stress.
- Versatile Fabrication: Supports various machining and forming processes for diverse applications.
Applications
Haynes 188 Cobalt Alloy Rod is engineered for industries requiring durability in harsh conditions:
- Aerospace: Used in turbine blades, combustor cans, and afterburner parts for high-temperature performance.
- Gas Turbines: Ideal for hot-section components like transition ducts and flame holders.
- Chemical Processing: Employed in equipment exposed to corrosive gases and high temperatures.
- Power Generation: Suitable for furnace components and heat exchangers in extreme thermal environments.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Cobalt (Co) | Balance |
| Nickel (Ni) | 20.0–24.0 |
| Chromium (Cr) | 21.0–23.0 |
| Tungsten (W) | 13.0–15.0 |
| Iron (Fe) | 3.0 max |
| Manganese (Mn) | 1.25 max |
| Silicon (Si) | 0.2–0.5 |
| Carbon (C) | 0.05–0.15 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 960 (at 20°C) |
| Yield Strength (MPa) | 450 (at 20°C) |
| Elongation (%) | 55 |
| Hardness (HB) | 220–270 |
| Creep Strength (MPa, 1000h at 870°C) | 70 |
Chemical Properties
Haynes 188 Cobalt Alloy Rod offers robust resistance to various chemical environments:
- Acids: Effectively resists dilute sulfuric and nitric acids at moderate temperatures, suitable for mild acidic conditions.
- Alkalis: Exhibits strong resistance to alkaline solutions, maintaining integrity in caustic environments.
- Chlorides: Performs reliably in low-chloride settings, though pitting may occur with prolonged exposure to concentrated chloride solutions.
- Environmental Limits: Avoid prolonged exposure to highly acidic or reducing environments below 500°C (932°F) to prevent corrosion. Not recommended for molten salts or highly concentrated chloride conditions.
Things to Note (Limitations)
- High-Temperature Limits: Avoid prolonged exposure above 2200°F (1204°C) to prevent embrittlement and loss of mechanical properties.
- Corrosive Environments: Limited resistance in highly reducing conditions or molten salt environments, risking accelerated degradation.
- Post-Welding Care: Requires heat treatment after welding to restore ductility and avoid cracking in high-stress applications.
- Low-Temperature Corrosion: Susceptible to pitting in concentrated chloride solutions below 500°C; not ideal for such conditions.
Corrosion Data for Haynes 188 Cobalt Alloy Rod
| Corrosion Type | Conditions | Resistance Details | Maximum Temperature (°F) | Comments |
|---|---|---|---|---|
| Atmospheric Corrosion | Ambient atmospheric exposure | Excellent resistance, effective long-term use in industrial environments | N/A | Ideal for aviation and industrial applications |
| Oxidation Resistance | Continuous and prolonged in oxidizing gases | Exceptional up to 2000°F. Low degradation and metal loss | 2000 | Exceptional at high operating temperatures |
| Sulfuric Corrosion | Presence of sulfur deposits and gasses | Withstands low-velocity environments with sulfur-bearing fuels | 1650 | Periodic monitoring recommended in severe conditions |
| Hot Corrosion | Industrial heated chemical exposure (sulfates) | Excellent sulfate deposit hot corrosion resistance under burner rig test conditions | 1650 | Specifically tested for jet turbine environments |
Contact us for detailed corrosion resistance data specific to your application.
Best Welding and Manufacturing Practices
- Welding: Use TIG or plasma arc welding with Haynes 188 filler metals.
- Preheating: Preheat thick sections to 200–300°C to prevent cracking.
- Post-Weld Treatment: Anneal at 1175°C and cool rapidly to restore ductility.
- Machining: Use carbide tools, low speeds, and coolant to avoid work hardening.
- Forming: Cold form simple shapes; hot form at 1050–1200°C for complex ones.
- Surface Prep: Clean surfaces before welding to ensure strong welds.
Customer Reviews of Haynes 188 Cobalt Alloy Rod
Frequently Asked Questions
Q: What makes Haynes 188 Cobalt Alloy Rod different from Haynes 25?
A:
Haynes 188 offers better weldability and oxidation resistance at high temperatures compared to Haynes 25, though it has slightly lower strength. It’s ideal for applications requiring complex fabrication.
Q: Which industries benefit most from Haynes 188 Round Bar?
A: Aerospace, gas turbine, chemical processing, and power generation industries use Haynes 188 for components in high-temperature and corrosive environments.
Q: Can Haynes 188 Cobalt Alloy Rod be customized?
A: Yes, we provide custom diameters, lengths, and surface finishes to meet specific project needs. Contact our sales team for details.
Q: What are the temperature limitations of Haynes 188 Cobalt Alloy Bar?
A: It performs well up to 2000°F (1093°C) but should not be exposed to temperatures above 2200°F (1204°C) for extended periods to avoid embrittlement.
Q: How does Haynes 188 resist corrosion?
A: Haynes 188 excels in atmospheric and sulfur-containing environments but has limited resistance to concentrated chloride solutions or molten salts.
Q: What welding methods are best for Haynes 188 Round Bar?
A: TIG (GTAW) and plasma arc welding with matching Haynes 188 filler metals are recommended for strong, durable welds.