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GH5188 (Haynes 188/UNS R30188) Rod
GH5188 is a cobalt-based solid-solution-strengthened superalloy with outstanding high-temperature strength (up to 1100°C), oxidation resistance, and corrosion resistance. Key features include:
- High-Temperature Stability: Retains mechanical strength in extreme heat (continuous use at 1000–1100°C) .
- Corrosion Resistance: Resists sulfuric acid, chlorides, and high-temperature sulfidation .
- Machinability: Suitable for hot/cold forming, welding (TIG, laser), and additive manufacturing (SLM) .
Chemical Composition
Element | Content Range | Function |
C | 0.05–0.15 | Strengthens; balances plasticity |
Cr | 20.0–24.0 | Forms protective Cr₂O₃ oxide layer |
Ni | 20.0–24.0 | Stabilizes austenite; enhances ductility |
Co | Balance | Base metal; supports high-temperature structure |
W | 13.0–16.0 | Solid-solution strengthening; improves creep resistance |
La | 0.03–0.12 | Refines grain; enhances oxide film toughness |
Parameter | Value/Range |
Size Range | Φ5–300mm (customizable) |
Hardness (HRC) | 35–45 (after cold working) |
Density | 8.22 g/cm³ |
Yield Strength | ≥550 MPa (RT) |
Tensile Strength | ≥800 MPa (RT) |
Melting Point | 1300–1360°C |
I. Core Performance Advantages
1. High-Temperature Stability: Excellent oxidation resistance below 1100°C. The Cr₂O₃ and Al₂O₃ composite oxide film formed on the surface effectively blocks oxygen diffusion.
2. Mechanical Properties: After 8000 hours of long-term exposure at 650°C, it maintains an ultimate strength of 1045 MPa and a yield strength of 550 MPa, with an elongation of 29.1%.
3. Processability: Excellent hot working and cold forming properties allow for bar production through forging, rolling, and other processes. Excellent weldability (argon arc welded joints offer high strength).
4. Creep and Fatigue Resistance: High creep resistance below 980°C and outstanding fatigue resistance under cyclic loading make it suitable for dynamic stress environments.
II. Typical Applications
1. Aerospace: Manufacturing high-temperature components such as aircraft engine combustion ducts, guide vanes, and space shuttle tail nozzles.
2. Energy Industry: Used in gas turbine blades and nuclear heat exchangers, resistant to high-temperature corrosive gases.
3. Precision Components: Spherical powders produced through powder metallurgy processes (such as SS-PREP® technology) can be molded into complex structural parts.
Surface Treatment
- Hot-Rolled/Raw: Pickled and straightened.
- Cold-Drawn/Polished: Ground to Ra ≤0.8 μm.
- Special Coatings: Optional thermal barrier coatings (e.g., MCrAlY) for aerospace applications .
Why Choose Us ?
- Certified Standards: Compliant with GB/T 14992, GJB 3317A, and AMS 5608 .
- Advanced Processing: Vacuum induction melting + ESR/VAR for purity .
- Global Supply: Stock in USA/EU/Asia with 48-hour lead time.
Applications & Industries
Aerospace:
Used in manufacturing components of jet engines, such as combustors, turbine blades, and afterburners.
Gas Turbine & Missile Parts:
Applied in gas turbine components (e.g., combustion chambers, exhaust nozzles) and missile high-temperature structures.
Nuclear & Energy Equipment:
Suitable for heat exchangers in nuclear power plants and high-temperature reaction devices in energy systems.
Frequently Asked Questions
Q1: Can GH5188 be welded?
A: Yes, using TIG or laser welding with pre/post-heat to prevent cracking .
Q2: What’s the max service temperature?
A: 1100°C continuous; 1200°C short-term .
Q3: What are the primary applications of GH5188 rods?
A: Designed for extreme environments:
Aerospace: Combustion chamber components, turbine shafts
Energy: Gas turbine blades, nuclear reactor structural parts
Petrochemical: High-temperature reactor valves, furnace fixtures
Q4: How does La improve performance?
A: La enhances:
Oxidation resistance by promoting Cr₂O₃ formation
Grain boundary cohesion, reducing intergranular cracking
Q5: What is the technical standard for GH5188 alloy bars?
A: The production of GH5188 alloy bars complies with the following standards:
- GJB 3317-1998 (Specification for Hot-Rolled Sheets of High-Temperature Alloys for Aviation)
- Q/5B4022-1992 (Technical Conditions for GH188 Alloy Bars)
These standards regulate chemical composition, mechanical properties, and manufacturing requirements for aviation applications.
Q6: What standards apply to GH5188 bars?
A:
- GJB 3317-1998: Chinese military standard for hot-rolled sheets.
- Q/5B 4022: Technical specification for alloy bars.
- AMS 5608: U.S. aerospace material standard.
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