Products Features
Excellent High-Temperature Strength and Creep Resistance
Haynes 25 demonstrates outstanding tensile strength, yield strength, and creep resistance within the 600-1000°C range due to solid solution strengthening (tungsten) in the cobalt matrix and dispersion strengthening by carbides. It retains high creep rupture strength even at 980°C, making it suitable for turbine blades, combustion chamber components, and guide vanes that are subjected to prolonged high-temperature stress.
Superior Oxidation and Thermal Corrosion Resistance
The high chromium content (approximately 20%) promotes the formation of a dense, stable Cr₂O₃ oxide film on the alloy surface, effectively preventing base metal oxidation in oxidizing atmospheres up to 1000°C. Additionally, the cobalt matrix provides good resistance to thermal corrosion media such as sulfur and vanadium, particularly beneficial for gas turbine environments using sulfur-containing fuels.
Good Microstructural Stability and Thermal Fatigue Resistance
Haynes 25 maintains microstructural stability during long-term high-temperature service with low tendency for precipitation of harmful phases (such as sigma phase). It possesses excellent thermal fatigue resistance. Even under conditions of frequent temperature fluctuations, its mechanical and oxidation properties remain stable, making it suitable for gas turbine and industrial furnace components subject to frequent start-up and shutdown cycles.
Good Fabrication and Welding Properties
Haynes 25 offers good hot and cold workability, allowing fabrication via conventional processes such as forging, rolling, and forming. It has good weldability and is compatible with various welding methods including Gas Tungsten Arc Welding (GTAW) and Plasma Welding, requiring no special post-weld heat treatment. Conventional machining (turning, milling, drilling) is applicable; the use of hard metal cutting tools is recommended.
Technical Specifications
Chemical Composition
|
Element |
Standard requirements |
Note |
|
Co |
Remaining quantity(51-55%) |
Matrix elements that provide high-temperature strength, thermal stability, and excellent thermal corrosion resistance |
|
Cr |
19.0 - 21.0% |
Form a dense Cr₂O₃ protective film, providing oxidation and thermal corrosion resistance |
|
W |
14.0 - 16.0% |
Provides significant solid solution strengthening and carbide strengthening, enhancing high-temperature creep resistance |
|
Ni |
9.0 - 11.0% |
Stabilize the austenitic structure, improve toughness and machinability |
|
Fe |
≤ 3.0% |
Strict control to ensure purity and organizational stability |
|
C |
0.05 - 0.15% |
Forming carbides with chromium and tungsten, it is the core source of high-temperature strength |
|
Mn |
≤ 1.0% |
Deoxidizer, improve hot working properties |
|
Si |
≤ 0.40% |
Deoxidizer |
|
P |
≤ 0.040% |
Impurity elements |
|
S |
≤ 0.030% |
Prevent hot brittleness |
|
B |
≤ 0.015% |
Minor additions to enhance grain boundary strength |
Physical Properties
|
Property |
Value/Range |
Test Conditions |
|
Density |
9.13 g/cm³ |
Room Temperature (20°C) |
|
Melting Point |
1330 - 1410°C |
- |
|
Coefficient of Thermal Expansion (20-100°C) |
12.3 × 10⁻⁶ /K |
- |
|
Elastic modulus (Young's modulus) |
220 - 230 GPa |
Room Temperature |
|
Thermal Conductivity (20°C) |
9.0 - 10.0 W/(m·K) |
- |
|
Resistivity |
0.85 - 0.95 μΩ·m |
Room Temperature |
|
Magnetism |
Non-magnetic (weakly magnetic) |
Cobalt-based alloys are typically non-magnetic or weakly magnetic at room temperature |
Mechanical Properties (Annealed Condition, Typical Values)
|
Property |
Typical Value |
Specification |
|
Tensile Strength |
≥ 900 MPa |
AMS 5759 |
|
Yield Strength (0.2% Offset) |
≥ 450 MPa |
AMS 5759 |
|
Elongation |
≥ 40% |
AMS 5759 |
|
Hardness |
≤ 100 HRB(Annealed state) |
- |
Note: Strength can be significantly increased after cold working, but elongation decreases.
High-temperature performance
Haynes 25 exhibits excellent strength retention at high temperatures, with the following typical reference values:
|
Temperature |
Tensile Strength (Typical Value) |
Sustained Strength (100h, Typical Value) |
|
Room Temperature |
≥ 900 MPa |
- |
|
540°C |
850 MPa |
- |
|
730°C |
700 MPa |
200 MPa |
|
870°C |
500 MPa |
110 MPa |
|
980°C |
350 MPa |
50 MPa |
Antioxidant Performance:
In oxidizing atmospheres up to 1000°C, Haynes 25 forms a dense and well-adhered Cr₂O₃ oxide layer on its surface, resulting in an oxidation weight gain rate significantly lower than that of conventional stainless steels. In environments involving combustion of sulfur-containing fuels, its thermal corrosion resistance is markedly superior to many iron-based and nickel-based high-temperature alloys.
Microstructural Stability:
During long-term exposure between 600-1000°C, the carbide structure of Haynes 25 remains stable with low tendency for harmful phase precipitation, ensuring its mechanical properties and toughness during prolonged high-temperature service.
Suitable Media:
1. High-temperature air and combustion flue gases (containing sulfur and vanadium)
2. High-temperature oxidizing atmospheres
3. Thermal corrosion environments (containing Na₂SO₄, V₂O₅, etc.)
4. High-temperature gaseous streams (flow path environment of gas turbines)
Note: Haynes 25 is primarily intended for use in high-temperature gaseous media environments and is not suitable for aqueous corrosion environments.
Haynes 25 is designed for extreme high-temperature, oxidation, and thermal corrosion environments and is recommended for the following fields:
Application Fields
-
Aerospace: Gas turbine combustors, flame tubes, transition ducts, turbine blades, guide vanes, afterburner components, and high-temperature seals.
-
Industrial Gas Turbines: Hot-end components such as combustor parts, transition sections, turbine seal rings, and guide vanes.
-
High-Temperature Industrial Furnaces: Furnace rolls, radiation tubes, heat treatment fixtures, baskets, furnace bottom plates, and high-temperature conveyor belts.
-
Petrochemical Industry: Ethylene cracking furnace tubes, high-temperature reactor internals, high-temperature wear-resistant components of catalytic cracking units, and heating furnace tubes.
-
Power Generation: High-temperature fasteners for steam turbines, boiler burner nozzles, and high-temperature corrosion-resistant components in waste-to-energy power plants.
-
Automotive Engines: High-performance turbocharger turbine housings, exhaust manifold gaskets, and high-temperature bolts.
-
Nuclear Industry: Components of high-temperature gas-cooled reactors and internal reactor structures.
-
Glass and Ceramic Industries: Glass forming molds, hot pressing molds, and glass fiber drawing orifice plates.
Delivery and Customization
We offer flexible and reliable supply chain solutions to ensure you receive Haynes 25 materials that perfectly match your project requirements.
|
Form |
 Sheet/Plate
|
 Bar/Rod
|
 Seamless Pipe
|
 Strip/Sheet Coil
|
 Wire/Wire Rod
|
Forging
|
Precision castings
|
|---|---|---|---|---|---|---|---|
|
Conventional Range |
Thickness 0.5 – 100 mm |
Diameter Φ6-500mm |
Outer diameter Φ10 – 300 mm |
Thickness 0.1 – 3.0 mm |
Diameter Φ0.5-10mm |
Customize according to the drawings |
Customize according to the drawings |
|
Customization Capability |
Gas turbine combustor, flame tube, transition duct, heat shield, high-temperature furnace liner |
High-temperature bolts, fasteners, valve stems, shaft parts, and turbine blades (machined) |
High-temperature furnace tubes, heat exchanger tube bundles, flue gas pipelines, nuclear reactor cooling tubes |
Bellows, elastic elements, precision stampings, seal washers |
Welding wires (TIG/ MIG), springs, mesh belt weaving, fasteners |
Turbo disks, structural components, and complex high-temperature load-bearing parts |
Guide vanes, turbine seal rings, and combustion chamber components (relatively uncommon but customizable) |
Why Choose Us? - Reliable Engineering Technology. Dependable Delivery.
We are not just a supplier, but a trusted materials partner for you in China.
Vertically Integrated Production
Own 20,000㎡ facility with 10+ automated lines (8,000+ tons/year). In-house tooling & die center enables rapid customization and effective cost control - no middleman markup.
Strict Quality Control at Every Stage
Full traceability across key QC checkpoints throughout production. 100% compliant with ASTM/ASME, EN, and GB standards. Material test reports available with every shipment
Reliable Delivery & Export Packaging
10+ years exporting to Europe, North America, Southeast Asia & Middle East with waterproof and anti-rust protection, combined with flexible shipping options ensures safe and on-time arrival.
Sample Validation Before Mass Production
We provide free samples for quality verification, allowing you to place bulk orders only after approval. We ensure consistency from sample to mass production by accurate dimensional measurement and transparent manufacturing.
FAQ
Q: What are the main advantages of Haynes 25?
Q: What heat treatment is required for Haynes 25?
Q: What is the maximum service temperature?
Q: What is the difference between Haynes 25 and Hastelloy X?
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