Key Performance Features of High-Temperature Alloys for Power Generation

1. Excellent High-Temperature Strength & Creep Resistance

   Maintain stable mechanical properties under long-term high-temperature service, resisting slow deformation (creep) caused by sustained heat and load.

2. Superior Oxidation & Corrosion Resistance

   Withstand flue gas, steam and corrosive media, preventing surface scaling, rust and material degradation at extreme temperatures.

3. Good Thermal Fatigue Resistance

   Adapt to frequent temperature fluctuations and thermal cycling, avoiding cracks and failure from repeated heating and cooling.

4. Dense Metallurgical Structure

   Advanced casting processes eliminate internal defects, ensuring reliability for critical power equipment running around the clock.

Common High-Temperature Alloy Grades

Heat-Resistant Cast Steels

• ASTM A217 WC6 / WC9: Cr-Mo alloy castings, ideal for boiler valves, pressure parts and steam pipeline components
• ASTM A351 CF8 / CF8M: Austenitic stainless steel, for medium-to-high temperature turbine auxiliary parts and housings
• ASTM A351 HK40 / HP40: High alloy heat-resistant steel, used for furnace tubes, radiant tubes and high-temperature headers

High-Chromium Ferritic/Martensitic Alloys

• F91 / F92 (9Cr-1Mo-V): Premium grade for ultra-high temperature turbine casings, main steam valves and thick-wall pressure components

Nickel-Based Superalloys

• Incoloy, Inconel series: For gas turbine hot-section parts, the highest performance materials for extreme heat environments

Main High-Temperature Alloy Castings for Power Generation

Boiler & Steam System Castings

• Boiler valve bodies, valve trim and bonnets
• High-temperature pipe elbows, tees and headers
• Furnace components, grate bars and combustion chamber parts
• Steam turbine outer casings and support frames

Turbine Core Components

• Turbine casings (inner & outer)
• Diaphragms, nozzle boxes and blade carriers
• Turbine hubs, rotor discs and bearing housings
• Exhaust housings and diffuser parts

Production & Manufacturing Processes

1. Premium Casting Technologies

   Adopt resin sand casting and precision investment casting. Suitable for large thick-wall castings and intricate thin-walled turbine parts with complex profiles.

2. Professional Heat Treatment

   Solution annealing, normalizing and tempering to optimize grain structure, relieve stress and enhance high-temperature performance.

3. Precision Machining

   CNC turning, milling and boring to achieve tight tolerances for assembly, sealing and dynamic rotation.

4. Surface Treatment

   Anti-oxidation coating and shot blasting to extend service life under harsh thermal conditions.

Strict Quality Control Standards

• Full spectral analysis of chemical composition to comply with ASTM, EN and power industry specifications
• Mechanical testing: tensile strength, hardness, impact and high-temperature endurance tests
• Non-destructive testing: UT, MT, PT to detect micro-cracks, porosity and inclusions
• Metallographic inspection for grain structure and phase composition
• Complete Material Test Certificates (MTC) and third-party inspection reports
• Dimensional verification for assembly accuracy

Application Coverage

• Thermal power plants: Steam turbines, coal-fired boiler systems
• Combined-cycle power plants: Gas turbines and heat recovery equipment
• Industrial captive power stations and waste heat power generation units

Conclusion