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GH5188 Cobalt Alloy
Complete Technical Data Sheet for GH5188 Cobalt Alloy Chemical Composition Mechanical Properties Physical Properties International Standards & Grade Equivalents Key Applications of GH5188 Cobalt Alloy Aerospace & Jet Engines Widely used for combustor cans, transition ducts, afterburner components, and flame holders that endure extreme heat cycles. Industrial Gas Turbines Ideal for blades, vanes, and other […]
Description
Grade GH5188 Cobalt Alloy Specifications
GH5-188 Cobalt Alloy Plates
Our GH5-188 Cobalt Alloy plates are the premier material for fabricating components that demand superior strength and oxidation resistance at extreme temperatures. This superalloy offers excellent formability in the annealed state, making it ideal for creating robust combustion chambers, transition ducts, and other critical “hot section” parts for the aerospace and industrial gas turbine industries.
GH5-188 Cobalt Alloy Bars
Available in round, square, and flat profiles, our GH5188 Cobalt Alloy bars are a superior machining stock for creating parts that operate under extreme heat and stress. The material’s ability to maintain high strength at temperatures up to 1095°C (2000°F) makes it the perfect choice for manufacturing durable fasteners, fittings, and structural hardware for afterburners and industrial furnaces.
GH5-188 Cobalt Alloy Wire
Engineered for reliability in high-heat applications, our GH5-188 Cobalt Alloy wire is offered both as a high-strength welding consumable and for component manufacturing. Its excellent ductility and resistance to high-temperature oxidation make it a superior choice for creating weld overlays, specialized springs, and woven mesh for use in the most demanding thermal environments.
GH5-188 Cobalt Alloy Forgings
For mission-critical components that require the ultimate in high-temperature integrity, our GH5-188 Cobalt Alloy forgings deliver unmatched performance. The forging process refines the grain structure to maximize the alloy’s inherent strength and fatigue resistance at extreme temperatures, making it the definitive choice for creating turbine rings, flanges, and valve bodies.
Complete Technical Data Sheet for GH5188 Cobalt Alloy
| Element | Composition (%) |
|---|---|
| Cobalt | Balance |
| Chromium | 20.0 – 24.0 |
| Nickel | 20.0 – 24.0 |
| Tungsten (W) | 13.0 – 15.0 |
| Iron | ≤ 3.0 |
| Manganese | ≤ 1.25 |
| Silicon | 0.20 – 0.50 |
| Lanthanum (La) | 0.02 – 0.12 |
| Carbon | 0.05 – 0.15 |
| Property | Value at Room Temperature |
|---|---|
| Tensile Strength | 950 MPa (138 ksi) |
| Yield Strength (0.2% Offset) | 485 MPa (70 ksi) |
| Elongation | 50% |
| Hardness (Rockwell B) | ≤ 95 HRB |
| Stress Rupture Strength (at 982°C / 1800°F for 1000 hrs) |
24 MPa (3.5 ksi) |
| Property | Typical Value at 20°C (68°F) |
|---|---|
| Density | 8.98 g/cm³ (0.324 lb/in³) |
| Modulus of Elasticity | 231 GPa (33,500 ksi) |
| Melting Range | 1300 – 1380 °C (2375 – 2520 °F) |
| Coefficient of Thermal Expansion | 12.4 µm/m·°C (from 20-100°C) |
| Thermal Conductivity | 10.8 W/m·K |
| Standard | Equivalent Grade Designation |
|---|---|
| Chinese Standard | GH5188 (also GH188) |
| UNS | R30188 |
| AMS (Aerospace Material Spec) | 5608 (Sheet, Strip, Plate), 5772 (Bars, Forgings) |
| ASTM | B435 |
| Common Trade Name | Haynes® 188 |
Why GH5188 is the Premier Choice for High-Heat Applications
Exceptional High-Temperature Strength
GH5188 stands out for its ability to retain outstanding mechanical properties and structural integrity during prolonged exposure to elevated temperatures, with continuous operation possible up to 2000°F (1095°C). This remarkable strength arises from its solid-solution strengthening mechanism, where a carefully balanced alloy composition of cobalt, chromium, and nickel inhibits dislocation movement and resists softening at high temperatures. As a result, GH5188 is the preferred choice for critical components such as turbine blades, combustion chambers, and jet engine parts, which demand unwavering performance and durability under the most extreme thermal stresses.
Outstanding Oxidation Resistance
GH5188 develops a robust, adherent oxide layer primarily composed of chromium oxide (Cr₂O₃) and minor constituents from its cobalt and nickel content. This protective layer forms naturally on the alloy surface when exposed to high temperatures or aggressive oxidizing environments, serving as a barrier that blocks further oxygen ingress and slows down material degradation. This property is especially crucial in hot sections of gas turbines, jet engines, and industrial furnaces, where components encounter continuous cycles of intense heat and contact with hot combustion gases. The exceptional oxidation resistance significantly prolongs service life, even under the harshest operating conditions found in aerospace and power generation industries.
Excellent Ductility and Weldability
GH5188 stands out by maintaining its ductility even after long-term high-temperature service, which is essential for minimizing the risk of cracking or brittleness in critical parts. This ductility enables easier forming, machining, and shaping into complex geometries during manufacturing. GH5188 is also highly compatible with popular welding techniques—including TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) welding—allowing for strong, high-quality joints without compromising alloy integrity. Its weldability streamlines on-site repairs and component fabrication, making it a top choice for applications that require both versatility and structural soundness.
Proven Chinese Superalloy
GH5188 stands out as a premier superalloy developed in China, earning a strong reputation both domestically and internationally for high quality and reliability. With a history rooted in advanced materials research, GH5188 has undergone extensive testing and continual improvements to meet the rigorous standards demanded by critical industries. Today, it is widely recognized across the global aerospace, power generation, metallurgical, and manufacturing sectors as a dependable and cost-effective alternative to other leading international alloys. Its widespread adoption in challenging applications—such as gas turbine hot-section parts, industrial furnace fixtures, and power plant components—demonstrates GH5188’s ability to deliver top-tier performance while helping organizations manage costs without compromising on safety or efficiency.
Key Applications of GH5188 Cobalt Alloy
Aerospace & Jet Engines
Widely used for combustor cans, transition ducts, afterburner components, and flame holders that endure extreme heat cycles.
Industrial Gas Turbines
Ideal for blades, vanes, and other hot-section components in power generation turbines requiring long service life.
Additive Manufacturing
Available as a high-performance metal powder for creating complex, heat-resistant parts using techniques like laser powder bed fusion.
What Our Clients Say
“GH5188 is our go-to material for jet engine afterburner components. Its combination of extreme high-temperature strength and oxidation resistance is exceptional. What truly sets it apart is its excellent fabricability; we can form and weld complex liners with a consistency that is rare for a superalloy of this caliber.”
Alex Johnson
Lead Manufacturing Engineer
“For our industrial gas turbine transition ducts, the performance of GH5188 has been phenomenal. Even after extensive operational hours at extreme temperatures, it exhibits virtually no degradation from oxidation. Its long-term stability and reliability give us the confidence we need for these critical, high-value assets.”
Dr. Elena Petrova
Senior Materials Scientist
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Frequently Asked Questions
What exactly is GH5188 Cobalt Alloy?
GH5188 is a high-performance, cobalt-based superalloy known for its exceptional strength and oxidation resistance at very high temperatures, typically up to 1095°C (2000°F). It is a “solid-solution strengthened” alloy, meaning it derives its strength from its robust chemical composition rather than from an aging heat treatment.
What are the typical applications for GH5188?
Due to its high-temperature performance, GH5188 is primarily used in the aerospace and industrial gas turbine industries. Common applications include jet engine afterburner components, combustion can liners, transition ducts, flame holders, and other “hot section” parts that are subjected to extreme heat and oxidative environments.
What makes GH5188’s chemistry unique?
GH5188’s performance comes from a carefully balanced composition. It is a cobalt-nickel-chromium-tungsten alloy. The high Cobalt and Nickel content provide a stable matrix, Chromium offers oxidation resistance, and Tungsten provides solid-solution strengthening. Critically, it also contains a small amount of Lanthanum, which significantly improves the adherence of the protective oxide scale, drastically boosting its oxidation resistance.
How does GH5188 compare to other superalloys like Haynes® 25 (L-605)?
GH5188 (also known by the trade name Haynes® 188) was developed as a direct improvement over Haynes® 25. While both have similar high-temperature strength, GH5188 offers significantly better oxidation resistance, especially during prolonged exposure to high temperatures, due to the addition of Lanthanum. It also has better ductility after aging at high temperatures.
Is GH5188 difficult to weld?
No, one of the key benefits of GH5188 is its excellent weldability for a superalloy. It can be readily welded using standard methods like Gas Tungsten Arc Welding (GTAW/TIG) and Gas Metal Arc Welding (GMAW/MIG). Its good ductility helps to resist post-weld cracking.
What heat treatment does GH5188 require?
GH5188 is a solid-solution strengthened alloy, so its primary heat treatment is a solution anneal. This is typically performed at a high temperature (around 1175°C / 2150°F) followed by rapid cooling. This process dissolves any unwanted precipitates, relieves stress from fabrication, and optimizes the material’s ductility and strength. It does not require an aging heat treatment to build strength.
In what forms is GH5188 available?
GH5188 is available in a wide range of product forms to suit various manufacturing needs, including plate, sheet, strip, bar, wire, and forgings. This versatility allows for the fabrication of both simple and highly complex components.
Is GH5188 magnetic?
No, GH5188 is a non-magnetic alloy in all conditions. This is a typical characteristic of cobalt-nickel based superalloys with this type of composition.
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