Product Description
Haynes 188 (China substitute material grades GH5188/GH188) is a cobalt-based superalloy renowned for its outstanding high-temperature mechanical properties and exceptional environmental resistance. The alloy's composition is predominantly cobalt, enhanced with significant additions of nickel, chromium, and tungsten, along with minor but critical alloying elements such as molybdenum, niobium, tantalum, titanium, lanthanum, and occasionally iron.
Haynes 188 retains remarkable strength at temperatures up to 980°C and demonstrates superior oxidation resistance even at 1100°C, making it an ideal material for critical high-temperature components in aircraft engines, including combustion chambers, turbine blades, and exhaust systems.It can be used to produce various deformed products, including thin plates, medium plates, strips, bars, forgings, wires, and precision castings.
Chemical Composition of Haynes188
·Cobalt (Co): Surplus
·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): 0.20-0.50%
·Carbon (C): 0.05-0.15%
·Boron (B): 0.015 max
·Lanthanum (La): 0.03-0.15%
Physical properties of Haynes188
·Density: Approximately 9.09 g/cm ³
·Melting point: approximately 1300-1360 ℃
·Thermal conductivity and specific heat capacity vary with temperature
·Linear expansion coefficient: varies with temperature
·Electrical resistivity: varies with temperature
·Non-magnetic alloy
Key Characteristics of Haynes 188 (GH188) Alloy
1. High-Temperature Strength
Haynes 188 exhibits exceptional high-temperature strength, maintaining structural integrity under extreme thermal conditions. Its superior creep resistance and long-term durability ensure reliable performance in prolonged high-stress environments.
2. Oxidation & Corrosion Resistance
The alloy demonstrates outstanding oxidation resistance, effectively withstanding degradation at elevated temperatures (up to 1100°C). This property ensures material stability and prolonged service life in aggressive atmospheres.
3. Machinability & Weldability
Haynes 188 offers excellent manufacturability, allowing for conventional machining (cutting, milling) and high-integrity welding without significant loss of properties. This facilitates complex component fabrication with minimal processing challenges.
4. Fatigue Resistance
The alloy delivers high fatigue resistance, sustaining extended service life under cyclic loading conditions. This makes it suitable for dynamic aerospace and power generation applications where repeated stress is a critical factor.
Similar Grades
Haynes Alloy No.188 (HA188), UNS R30188 (USA), KCN22W (France).
Technical standards for Haynes 188 (GH188) Alloy
GJB 3317-1998 "Specification for Hot Rolled High Temperature Alloy Plates for Aviation Use"
Z90103-1990 "Technical Conditions for GH188 Alloy Plate"
Z9132-1999 "Technical Conditions for GH188 Alloy Cold drawn Materials for Welding"
Q/5B 4002-1992 "GH188 Alloy Cold Rolled Strip"
Q/5B 4003-1992 "GH188 Alloy Cold Rolled Sheet"
Q/5B 4014-1992 "Technical Conditions for GH188 Alloy Forgings"
Q/5B 4020-1992 "K188 Alloy Investment Mold Precision Castings"
Q/5B 4022-1992 "GH188 Alloy Rod"
Q/5B 4057-1992 GH188 High Temperature Alloy Cold drawn Welding Wire
Heat Treatment
The heat treatment process of Haynes188 includes solution treatment, typically carried out at 2125-2175 ° F (1163-1191 ° C), followed by rapid cooling or water quenching to achieve optimal performance.
- Hot rolled sheet: 1170-1190 ° C, air-cooled.
- Cold rolled strip and sheet: 1165-1230 ° C, rapid air cooling.
- Bar and forgings: 1180 ° C ± 10 ° C, rapid air cooling
Mechanical Property
The mechanical properties of Haynes188 vary under different heat treatment conditions. Haynes188 in annealed state has an average yield strength of 642 MPa, tensile strength of 928 MPa, and elongation of 57.3%. Alloys can increase their yield strength through cold working, up to a maximum of 250 ksi (1725 MPa).
Welding performance
Haynes188 can be welded manually or automatically, including tungsten inert gas welding (TIG), gas metal arc (MIG), electron beam, and resistance welding, with excellent welding performance.
Material Specifications & Supply Status
Available Product Forms:
Cold-rolled sheets: 0.5–4 mm thickness
Hot-rolled plates: 4–14 mm thickness (δ)
Cold-rolled strips: 0.05–0.8 mm thickness (supplied in coils)
Bars, forgings, welding wires, and precision castings (custom sizes available)
Processing & Delivery Conditions:
- Sheets/Plates: Supplied in solution-treated, pickled, straightened, and edge-trimmed condition; optional polished/mirror-finished surfaces available upon request.
- Strips: Provided in coils after solution treatment, pickling, and edge trimming.
- Forgings: Delivered in solution-annealed state for optimal machinability.
- Precision Castings: Supplied in as-cast condition, ready for further machining or heat treatment.
Test Equipment
Applications of Haynes 188 Alloy
Haynes 188 alloy finds extensive application in demanding high-temperature environments, particularly within the aerospace sector where it serves as a critical material for gas turbine engine components. Its exceptional properties make it ideally suited for combustion chambers, transition ducts, and afterburner assemblies that require reliable performance under extreme thermal conditions.
Beyond aerospace applications, this versatile alloy also demonstrates excellent serviceability in:
Chemical processing equipment
Industrial gas turbine systems
Nuclear energy installations
The material's outstanding combination of high-temperature strength, oxidation resistance, and fabricability has established it as a preferred choice for engineers designing components that must withstand aggressive thermal and corrosive environments across multiple industries.
Contact Us
If you are looking forHaynes 188 Alloy, you can contact specialized metal suppliers such as HSMetal who deal with high-performance Material. We can provide material certifications and custom sizes based on your needs.Welcome Inquiry Us!
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