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Function & Design
The high-pressure, medium-pressure, and low-pressure cylinders of a steam turbine are the core pressure-bearing and flow-guiding components of the turbine body. They perform critical functions such as forming the steam passage, supporting the rotor, installing diaphragms and seals, and bearing thermal stresses. Their primary roles are to house the rotor and stator components, guide steam flow along the designed path, facilitate the staged conversion of steam thermal energy into mechanical energy, and withstand varying levels of temperature and pressure, thereby ensuring the efficient and safe operation of the unit. These three cylinders operate in series according to the sequence of steam expansion, forming a staged working process of "high-temperature and high-pressure → medium-temperature and medium-pressure → low-temperature and low-pressure." This design aligns with the thermodynamic properties of steam to maximize its energy utilization. Their structural performance and manufacturing quality directly determine the efficiency, safety, and operational lifespan of the unit.
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Material & Structure
Regarding materials and structural design, high- and medium-pressure cylinders typically employ high-temperature-resistant alloy cast steel or alloy steel forged-and-welded structures, offering excellent high-temperature strength, creep resistance, and long-term operational stability. Low-pressure cylinders are reasonably designed using low-alloy steel or carbon steel welded structures based on capacity and exhaust conditions, balancing strength, stiffness, and manufacturing economy.
Technical Expertise
The company possesses mature design and manufacturing experience in cylinder flow paths, diaphragm mounting grooves, sealing structures, and thermal expansion compensation, which effectively reduces thermal stress concentration and enhances the overall efficiency and reliability of the unit.
Machining Process
Our company strictly adheres to steam turbine industry standards (such as GB, DIN, ISO, and related technical specifications). Key processes include quality control of castings and forgings, welding procedure qualification, heat treatment, rough and precision machining, as well as assembly verification.
The inner cavities, flange surfaces, and mating surfaces of the cylinders are processed using large-scale CNC gantry milling machines, floor-type boring and milling machines, and five-axis machining equipment to ensure geometric accuracy, coaxiality, and surface roughness meet the requirements of high-speed rotating equipment.
For welded cylinders, post-weld heat treatment and non-destructive testing (including UT, MT, RT, etc.) are strictly implemented to guarantee structural integrity and long-term service safety.
