ChS88U Nickel Alloy
General Technical Characteristics
ChS88U is a heat-resistant, corrosion-resistant cast nickel-based alloy designed for manufacturing components that operate at high temperatures and in aggressive gaseous environments.
The alloy is also known by the designation KhN57KVYUTMBRL. It is used to produce cast bar stock through vacuum induction remelting, which is subsequently used to manufacture shaped components for power engineering equipment by directional solidification.
The material is characterized by elevated chromium and cobalt content and is additionally alloyed with tungsten, titanium, aluminum, molybdenum, and hafnium. This combination of elements contributes to improved high-temperature strength, oxidation resistance, and corrosion resistance.
TU 14-1-4828-90 applies to the ChS88U-VI version.
Chemical Composition
| Element | Content, % |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 15.0–16.2 |
| Cobalt (Co) | 10.0–11.5 |
| Tungsten (W) | 4.7–5.9 |
| Titanium (Ti) | 4.2–5.0 |
| Aluminum (Al) | 2.6–3.3 |
| Molybdenum (Mo) | 1.6–2.3 |
| Niobium (Nb) | 0.1–0.3 |
| Hafnium (Hf) | 0.3–0.6 |
| Carbon (C) | 0.06–0.12 |
| Boron (B) | Max. 0.010 |
| Zirconium (Zr) | Approx. 0.030 |
| Yttrium (Y) | Approx. 0.030 |
| Silicon (Si) | Max. 0.30 |
| Manganese (Mn) | Max. 0.30 |
| Iron (Fe) | Max. 0.50 |
| Sulfur (S) | Max. 0.010 |
| Phosphorus (P) | Max. 0.010 |
Nickel forms the base of the alloy. The values shown refer to the ChS88U-VI version under TU 14-1-4828-90. The actual chemical composition must be confirmed by the certificate for the specific production batch.
Mechanical and Operating Properties
ChS88U belongs to the group of heat-resistant cast alloys designed for operation under high temperatures and significant mechanical loads.
The main properties of the material include:
- High-temperature strength.
- Resistance to high-temperature oxidation.
- Enhanced corrosion resistance.
- Resistance to creep and thermal deformation.
- Structural stability during prolonged exposure to elevated temperatures.
The alloy is intended for applications involving temperatures of up to 1150 °C. This is a reference indication of its application range, not a universally guaranteed operating temperature for every component. The permissible operating conditions depend on the component design, loading, and manufacturing technology.
Applications of ChS88U Nickel Alloy
The primary application of ChS88U is the production of heat-resistant cast components for power engineering and gas turbine equipment.
The alloy is used for:
- Manufacturing gas turbine rotor and nozzle blades.
- Producing components by directional solidification.
- Manufacturing cast bar stock through vacuum induction remelting.
- Producing components for power generation gas turbine units.
- Manufacturing parts operating at high temperatures and in corrosive environments.
Features of ChS88U Alloy
The main features of this material include:
- A nickel-based composition that provides high-temperature strength.
- High chromium content to improve oxidation and corrosion resistance.
- Cobalt, tungsten, and molybdenum alloying to enhance operating properties.
- Titanium and aluminum additions that contribute to structural strengthening.
- The addition of hafnium and other microalloying elements.
- Suitability for manufacturing complex cast components by directional solidification.
ChS88U and ChS88U-VI should be distinguished according to their specific versions and applicable regulatory documentation. When selecting the material, it is important to consider the chemical composition requirements, melting method, and properties required for the finished component.
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